From 69c58c27072fb011ec622e21bf8ccd0793bd7501 Mon Sep 17 00:00:00 2001
From: Chris Mayfield <mayfiecs@jmu.edu>
Date: Wed, 17 Jun 2020 14:59:40 -0400
Subject: [PATCH 1/9] ch07 revisions

---
 ch07/ArrayExamples.java | 27 ++++++++++++++-------------
 ch07/Doubloon.java      |  9 ++++-----
 ch07/Histogram.java     |  3 +--
 3 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/ch07/ArrayExamples.java b/ch07/ArrayExamples.java
index 0ac26f3..9fecdc0 100644
--- a/ch07/ArrayExamples.java
+++ b/ch07/ArrayExamples.java
@@ -30,6 +30,7 @@ public static void main(String[] args) {
             System.out.println(counts[i]);
         }
 
+        // displaying arrays
         int[] array = {1, 2, 3, 4};
         printArray(array);
 
@@ -49,9 +50,9 @@ public static void main(String[] args) {
         // copying with Arrays class
         double[] c = Arrays.copyOf(a, a.length);
 
-        // traversal
+        // traversing arrays
         for (int i = 0; i < a.length; i++) {
-            a[i] = Math.pow(a[i], 2.0);
+            a[i] *= a[i];
         }
 
         // search
@@ -66,10 +67,10 @@ public static void main(String[] args) {
     /**
      * Prints the elements of an array.
      */
-    public static void printArray(int[] array) {
-        System.out.print("{" + array[0]);
-        for (int i = 1; i < array.length; i++) {
-            System.out.print(", " + array[i]);
+    public static void printArray(int[] a) {
+        System.out.print("{" + a[0]);
+        for (int i = 1; i < a.length; i++) {
+            System.out.print(", " + a[i]);
         }
         System.out.println("}");
     }
@@ -77,22 +78,22 @@ public static void printArray(int[] array) {
     /**
      * Returns the index of the target in the array, or -1 if not found.
      */
-    public static int search(double[] a, double target) {
-        for (int i = 0; i < a.length; i++) {
-            if (a[i] == target) {
+    public static int search(double[] array, double target) {
+        for (int i = 0; i < array.length; i++) {
+            if (array[i] == target) {
                 return i;
             }
         }
-        return -1;
+        return -1;  // not found
     }
 
     /**
      * Returns the total of the elements in an array.
      */
-    public static double sum(double[] a) {
+    public static double sum(double[] array) {
         double total = 0.0;
-        for (int i = 0; i < a.length; i++) {
-            total += a[i];
+        for (int i = 0; i < array.length; i++) {
+            total += array[i];
         }
         return total;
     }
diff --git a/ch07/Doubloon.java b/ch07/Doubloon.java
index 61103e0..aba5ed7 100644
--- a/ch07/Doubloon.java
+++ b/ch07/Doubloon.java
@@ -2,7 +2,7 @@
  * Example from the end of Chapter 7.
  */
 public class Doubloon {
-    
+
     public static boolean isDoubloon(String s) {
         
         // count the number of times each letter appears
@@ -21,10 +21,9 @@ public static boolean isDoubloon(String s) {
         }
         return true;
     }
-    
+
     public static void main(String[] args) {
-        System.out.println(isDoubloon("Mama"));
-        System.out.println(isDoubloon("Lama"));
+        System.out.println(isDoubloon("Mama"));  // true
+        System.out.println(isDoubloon("Lama"));  // false
     }
-    
 }
diff --git a/ch07/Histogram.java b/ch07/Histogram.java
index 32b029c..fe9f0b7 100644
--- a/ch07/Histogram.java
+++ b/ch07/Histogram.java
@@ -31,8 +31,7 @@ public static int inRange(int[] a, int low, int high) {
     }
 
     public static void main(String[] args) {
-        int numValues = 8;
-        int[] array = randomArray(numValues);
+        int[] array = randomArray(8);
         ArrayExamples.printArray(array);
 
         int[] scores = randomArray(30);

From 4ce61936e55cbcac556a88f37537d54a5d8e46d7 Mon Sep 17 00:00:00 2001
From: Chris Mayfield <mayfiecs@jmu.edu>
Date: Wed, 17 Jun 2020 15:09:19 -0400
Subject: [PATCH 2/9] ch08 revisions

---
 ch08/CodingBat.java                    | 23 +++++++++++-----
 ch08/{Recursion.java => Examples.java} | 38 ++++++++++++--------------
 ch08/Series.java                       |  3 --
 3 files changed, 34 insertions(+), 30 deletions(-)
 rename ch08/{Recursion.java => Examples.java} (92%)

diff --git a/ch08/CodingBat.java b/ch08/CodingBat.java
index c51f2f4..f6ad0d5 100644
--- a/ch08/CodingBat.java
+++ b/ch08/CodingBat.java
@@ -3,26 +3,35 @@
  */
 public class CodingBat {
 
-    public static String noX(String str) {
+    /**
+     * See https://codingbat.com/prob/p118230.
+     */
+    public String noX(String str) {
         if (str.length() == 0) {
             return "";
         }
-        char c = str.charAt(0);
-        if (c == 'x') {
-            return noX(str.substring(1));
+        char first = str.charAt(0);
+        String rest = str.substring(1);
+        String recurse = noX(rest);
+        if (first == 'x') {
+            return recurse;
         } else {
-            return c + noX(str.substring(1));
+            return first + recurse;
         }
     }
 
+    /**
+     * See https://codingbat.com/prob/p135988.
+     */
     public int array11(int[] nums, int index) {
         if (index >= nums.length) {
             return 0;
         }
+        int recurse = array11(nums, index + 1);
         if (nums[index] == 11) {
-            return 1 + array11(nums, index + 1);
+            return recurse + 1;
         } else {
-            return array11(nums, index + 1);
+            return recurse;
         }
     }
 
diff --git a/ch08/Recursion.java b/ch08/Examples.java
similarity index 92%
rename from ch08/Recursion.java
rename to ch08/Examples.java
index 04ac198..39b22dd 100644
--- a/ch08/Recursion.java
+++ b/ch08/Examples.java
@@ -1,19 +1,4 @@
-public class Recursion {
-
-    public static void main(String[] args) {
-        System.out.println("countdown");
-        countdown(3);
-
-        System.out.println("nLines");
-        nLines(3);
-
-        System.out.println("countup");
-        countup(3);
-
-        System.out.println("displayBinary");
-        displayBinary(23);
-        System.out.println();
-    }
+public class Examples {
 
     public static void countdown(int n) {
         if (n == 0) {
@@ -24,10 +9,6 @@ public static void countdown(int n) {
         }
     }
 
-    public static void newLine() {
-        System.out.println();
-    }
-
     public static void nLines(int n) {
         if (n > 0) {
             System.out.println();
@@ -56,4 +37,21 @@ public static void displayBinary(int value) {
         }
     }
 
+    public static void main(String[] args) {
+        System.out.println("countdown");
+        countdown(3);
+
+        System.out.println("nLines");
+        nLines(3);
+
+        // forever("Ha!");
+
+        System.out.println("countup");
+        countup(3);
+
+        System.out.println("displayBinary");
+        displayBinary(23);
+        System.out.println();
+    }
+
 }
diff --git a/ch08/Series.java b/ch08/Series.java
index 86e8148..fb1c860 100644
--- a/ch08/Series.java
+++ b/ch08/Series.java
@@ -1,6 +1,3 @@
-/**
- * Examples from Chapter 8.
- */
 public class Series {
 
     public static int factorial(int n) {

From 6cc2f1082f6bfd4e0781e4bfbf36a6fd02085cec Mon Sep 17 00:00:00 2001
From: Chris Mayfield <mayfiecs@jmu.edu>
Date: Wed, 17 Jun 2020 15:29:48 -0400
Subject: [PATCH 3/9] ch09 revisions

---
 ch09/ArgValid.java | 20 ++++++++++++++++++++
 ch09/BigInt.java   | 20 ++++++++++++++++++++
 ch09/Objects.java  | 36 ++++++++++++++++++++----------------
 ch09/Tables.java   | 38 +++++++++++++-------------------------
 4 files changed, 73 insertions(+), 41 deletions(-)
 create mode 100644 ch09/ArgValid.java
 create mode 100644 ch09/BigInt.java

diff --git a/ch09/ArgValid.java b/ch09/ArgValid.java
new file mode 100644
index 0000000..29e4d0a
--- /dev/null
+++ b/ch09/ArgValid.java
@@ -0,0 +1,20 @@
+/**
+ * Example of argument validation.
+ */
+public class ArgValid {
+
+    public static boolean isCapitalized(String str) {
+        if (str == null || str.isEmpty()) {
+            return false;
+        }
+        return Character.isUpperCase(str.charAt(0));
+    }
+
+    public static void main(String[] args) {
+        System.out.println(isCapitalized("Hi!"));
+        System.out.println(isCapitalized("bye"));
+        System.out.println(isCapitalized(""));
+        System.out.println(isCapitalized(null));
+    }
+
+}
diff --git a/ch09/BigInt.java b/ch09/BigInt.java
new file mode 100644
index 0000000..05b4da5
--- /dev/null
+++ b/ch09/BigInt.java
@@ -0,0 +1,20 @@
+import java.math.BigInteger;
+
+/**
+ * BigInteger examples.
+ */
+public class BigInt {
+
+    public static void main(String[] args) {
+        long x = 17;
+        BigInteger big = BigInteger.valueOf(x);
+
+        String s = "12345678901234567890";
+        BigInteger bigger = new BigInteger(s);
+
+        BigInteger a = BigInteger.valueOf(17);
+        BigInteger b = BigInteger.valueOf(1700000000);
+        BigInteger c = a.add(b);
+    }
+
+}
diff --git a/ch09/Objects.java b/ch09/Objects.java
index 6dde3a0..ae7b350 100644
--- a/ch09/Objects.java
+++ b/ch09/Objects.java
@@ -1,5 +1,3 @@
-import java.math.BigInteger;
-
 /**
  * Demonstrates uses of objects and wrappers.
  */
@@ -14,22 +12,40 @@ public static void main(String[] args) {
         char[] array = {'c', 'a', 't'};
         String word = "dog";
 
+        String word1 = new String("dog");  // creates a string object
+        String word2 = "dog";  // implicitly creates a string object
+        
+        // the null keyword
+
+        String name0 = null;
+        int[] combo = null;
+        // System.out.println(name0.length());  // NullPointerException
+        // System.out.println(combo[0]);        // NullPointerException
+
         // Strings are immutable
 
         String name = "Alan Turing";
         String upperName = name.toUpperCase();
 
+        name.toUpperCase();           // ignores the return value
+        System.out.println(name);
+        name = name.toUpperCase();    // references the new string
+        System.out.println(name);
+
         String text = "Computer Science is fun!";
         text = text.replace("Computer Science", "CS");
 
         // Wrapper classes
 
+        Integer i = Integer.valueOf(5);
+        System.out.println(i.equals(5));  // displays true
+
         Integer x = Integer.valueOf(123);
         Integer y = Integer.valueOf(123);
-        if (x == y) {                           // false
+        if (x == y) {                     // false
             System.out.println("x and y are the same object");
         }
-        if (x.equals(y)) {                      // true
+        if (x.equals(y)) {                // true
             System.out.println("x and y have the same value");
         }
 
@@ -38,18 +54,6 @@ public static void main(String[] args) {
 
         num = 12345;
         str = Integer.toString(num);
-
-        // BigInteger arithmetic
-
-        long z = 17;
-        BigInteger big = BigInteger.valueOf(z);
-
-        String s = "12345678901234567890";
-        BigInteger bigger = new BigInteger(s);
-
-        BigInteger a = BigInteger.valueOf(17);
-        BigInteger b = BigInteger.valueOf(1700000000);
-        BigInteger c = a.add(b);
     }
 
 }
diff --git a/ch09/Tables.java b/ch09/Tables.java
index f1a5423..1ceaec9 100644
--- a/ch09/Tables.java
+++ b/ch09/Tables.java
@@ -4,73 +4,61 @@
 public class Tables {
 
     public static void printRow() {
-        int i = 1;
-        while (i <= 6) {
+        for (int i = 1; i <= 6; i++) {
             System.out.printf("%4d", 2 * i);
-            i = i + 1;
         }
         System.out.println();
     }
 
     public static void printRow(int n) {
-        int i = 1;
-        while (i <= 6) {
+        for (int i = 1; i <= 6; i++) {
             System.out.printf("%4d", n * i);  // generalized n
-            i = i + 1;
         }
         System.out.println();
     }
 
     public static void printTable() {
-        int i = 1;
-        while (i <= 6) {
+        for (int i = 1; i <= 6; i++) {
             printRow(i);
-            i = i + 1;
         }
     }
 
     public static void printTable(int rows) {
-        int i = 1;
-        while (i <= rows) {  // generalized rows
+        for (int i = 1; i <= rows; i++) {     // generalized rows
             printRow(i);
-            i = i + 1;
         }
     }
 
     public static void printRow(int n, int cols) {
-        int i = 1;
-        while (i <= cols) {  // generalized cols
+        for (int i = 1; i <= cols; i++) {     // generalized cols
             System.out.printf("%4d", n * i);
-            i = i + 1;
         }
         System.out.println();
     }
 
     public static void printTable2(int rows) {
-        int i = 1;
-        while (i <= rows) {
-            printRow(i, rows);  // added rows argument
-            i = i + 1;
+        for (int i = 1; i <= rows; i++) {
+            printRow(i, rows);
         }
     }
 
     public static void main(String[] args) {
-        System.out.println("printRow()");
+        System.out.println("\nprintRow()");
         printRow();
 
-        System.out.println("printRow(6)");
+        System.out.println("\nprintRow(6)");
         printRow(6);
 
-        System.out.println("printTable()");
+        System.out.println("\nprintTable()");
         printTable();
 
-        System.out.println("printTable(6)");
+        System.out.println("\nprintTable(6)");
         printTable(6);
 
-        System.out.println("printRow(6, 6)");
+        System.out.println("\nprintRow(6, 6)");
         printRow(6, 6);
 
-        System.out.println("printTable2(6)");
+        System.out.println("\nprintTable2(6)");
         printTable2(6);
     }
 

From fbd0dca5e78e17f0ea4af5de6febe9dd634f49d2 Mon Sep 17 00:00:00 2001
From: Chris Mayfield <mayfiecs@jmu.edu>
Date: Wed, 17 Jun 2020 16:15:28 -0400
Subject: [PATCH 4/9] ch10 revisions

---
 ch10/Append.java    | 13 -------------
 ch10/Builder.java   | 35 +++++++++++++++++++++++++++++++++++
 ch10/PointRect.java | 21 +++++++++++++++++----
 3 files changed, 52 insertions(+), 17 deletions(-)
 delete mode 100644 ch10/Append.java
 create mode 100644 ch10/Builder.java

diff --git a/ch10/Append.java b/ch10/Append.java
deleted file mode 100644
index 98a9c10..0000000
--- a/ch10/Append.java
+++ /dev/null
@@ -1,13 +0,0 @@
-import java.util.Scanner;
-public class Append {
-    public static void main(String[] args) {
-        Scanner in = new Scanner(System.in);
-        System.out.println("Enter 10 lines:");
-        String text = "";
-        for (int i = 0; i < 10; i++) {
-            String line = in.nextLine();        // new string
-            text = text + line + '\n';    // two more strings
-        }
-        System.out.print("You entered:\n" + text);
-    }
-}
diff --git a/ch10/Builder.java b/ch10/Builder.java
new file mode 100644
index 0000000..8fe955e
--- /dev/null
+++ b/ch10/Builder.java
@@ -0,0 +1,35 @@
+import java.util.Scanner;
+
+/*
+ * StringBuilder example.
+ */
+public class Builder {
+
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+
+        // less efficient
+        System.out.println("Enter 10 lines:");
+        
+        String slow = "";
+        for (int i = 0; i < 10; i++) {
+            String line = in.nextLine();        // new string
+            slow = slow + line + '\n';    // two more strings
+        }
+        System.out.print("You entered:\n" + slow);
+
+        // more efficient
+        System.out.println("Enter 10 lines:");
+
+        StringBuilder text = new StringBuilder();
+        for (int i = 0; i < 10; i++) {
+            String line = in.nextLine();
+            text.append(line);
+            text.append('\n');
+        }
+        System.out.print("You entered:\n" + text);
+        
+        String result = text.toString();
+    }
+
+}
diff --git a/ch10/PointRect.java b/ch10/PointRect.java
index cb0af07..301dd90 100644
--- a/ch10/PointRect.java
+++ b/ch10/PointRect.java
@@ -9,27 +9,40 @@ public class PointRect {
     public static void main(String[] args) {
         Point blank;
         blank = new Point(3, 4);
-        System.out.println(blank);
 
         int x = blank.x;
         System.out.println(blank.x + ", " + blank.y);
         int sum = blank.x * blank.x + blank.y * blank.y;
 
+        // objects as parameters
+
         Point p1 = new Point(0, 0);
         Point p2 = new Point(3, 4);
+        double temp = distance(p1, p2);
         double dist = p1.distance(p2);  // dist is 5.0
+        System.out.println(blank);
+
+        // objects as return values
 
         Rectangle box = new Rectangle(0, 0, 100, 200);
-        moveRect(box, 50, 100);
+        Point center = findCenter(box);
+
+        // rectangles are mutable
+
+        moveRect(box, 50, 100);  // now at (50, 100, 100, 200)
         System.out.println(box);
+
+        box = new Rectangle(0, 0, 100, 200);
         box.translate(50, 100);
 
+        // aliasing revisited
+
         Rectangle box1 = new Rectangle(0, 0, 100, 200);
         Rectangle box2 = box1;
 
-        System.out.println(box2.width);
         box1.grow(50, 50);
-        System.out.println(box2.width);
+        System.out.println(box1);
+        System.out.println(box2);
     }
 
     /**

From af3f177f4c923ea5c2730bf906c2bdd6f7304e6c Mon Sep 17 00:00:00 2001
From: Chris Mayfield <mayfiecs@jmu.edu>
Date: Wed, 17 Jun 2020 16:37:41 -0400
Subject: [PATCH 5/9] ch11 revisions

---
 ch11/Time.java | 46 ++++++++++++++++++++++++++++++----------------
 1 file changed, 30 insertions(+), 16 deletions(-)

diff --git a/ch11/Time.java b/ch11/Time.java
index 951d5bf..fe5bfd6 100644
--- a/ch11/Time.java
+++ b/ch11/Time.java
@@ -25,6 +25,30 @@ public Time(int hour, int minute, double second) {
         this.second = second;
     }
 
+    public int getHour() {
+        return this.hour;
+    }
+
+    public int getMinute() {
+        return this.minute;
+    }
+
+    public double getSecond() {
+        return this.second;
+    }
+
+    public void setHour(int hour) {
+        this.hour = hour;
+    }
+
+    public void setMinute(int minute) {
+        this.minute = minute;
+    }
+
+    public void setSecond(double second) {
+        this.second = second;
+    }
+
     /**
      * Prints the time in a simple format.
      */
@@ -48,9 +72,10 @@ public String toString() {
      * Tests whether two times are equivalent.
      */
     public boolean equals(Time that) {
+        final double DELTA = 0.001;
         return this.hour == that.hour
             && this.minute == that.minute
-            && this.second == that.second;
+            && Math.abs(this.second - that.second) < DELTA;
     }
 
     /**
@@ -72,6 +97,7 @@ public Time add(Time t2) {
         sum.hour = this.hour + t2.hour;
         sum.minute = this.minute + t2.minute;
         sum.second = this.second + t2.second;
+
         if (sum.second >= 60.0) {
             sum.second -= 60.0;
             sum.minute += 1;
@@ -80,22 +106,10 @@ public Time add(Time t2) {
             sum.minute -= 60;
             sum.hour += 1;
         }
-        return sum;
-    }
-
-    /**
-     * Adds the given number of seconds to this object (modifier).
-     */
-    public void increment(double seconds) {
-        this.second += seconds;
-        while (this.second >= 60.0) {
-            this.second -= 60.0;
-            this.minute += 1;
-        }
-        while (this.minute >= 60) {
-            this.minute -= 60;
-            this.hour += 1;
+        if (sum.hour >= 24) {
+            sum.hour -= 24;
         }
+        return sum;
     }
 
 }

From 6b758bd58cfd697764d19fc38e51b2886b0b84ac Mon Sep 17 00:00:00 2001
From: Chris Mayfield <mayfiecs@jmu.edu>
Date: Mon, 29 Jun 2020 16:37:35 -0400
Subject: [PATCH 6/9] fix Scanner bug

---
 ch06/Strings.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ch06/Strings.java b/ch06/Strings.java
index ac6bc05..f8b40f0 100644
--- a/ch06/Strings.java
+++ b/ch06/Strings.java
@@ -38,6 +38,7 @@ public static void main(String[] args) {
             System.out.print("Enter a number: ");
         }
         double number = in.nextDouble();
+        in.nextLine();  // read the newline
 
         // String iteration
 

From 76a6ee26ca7409216766342b6dd19c84b022d6d3 Mon Sep 17 00:00:00 2001
From: Chris Mayfield <mayfiecs@jmu.edu>
Date: Sat, 30 Jan 2021 13:42:14 -0500
Subject: [PATCH 7/9] revised Checkstyle and Formatter

---
 Checkstyle.xml |  83 +++---
 Formatter.xml  | 704 +++++++++++++++++++++++++++----------------------
 user.dict      |   2 +
 3 files changed, 442 insertions(+), 347 deletions(-)
 create mode 100644 user.dict

diff --git a/Checkstyle.xml b/Checkstyle.xml
index 6cf2192..6788535 100644
--- a/Checkstyle.xml
+++ b/Checkstyle.xml
@@ -1,85 +1,110 @@
 <?xml version="1.0"?>
 <!DOCTYPE module PUBLIC
-    "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-    "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
+    "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+    "https://checkstyle.org/dtds/configuration_1_3.dtd">
 
 <!--
 Checkstyle configuration for Think Java, 2nd Edition.
 -->
 <module name="Checker">
+    <property name="severity" value="warning"/>
 
-    <!-- See http://checkstyle.sf.net/config.html#TreeWalker -->
+    <!-- See https://checkstyle.sourceforge.io/config.html#TreeWalker -->
     <module name="TreeWalker">
 
-        <!-- See http://checkstyle.sf.net/config_annotation.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_annotation.html -->
         <module name="AnnotationLocation"/>
         <module name="AnnotationUseStyle"/>
 
-        <!-- See http://checkstyle.sf.net/config_blocks.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_blocks.html -->
         <module name="AvoidNestedBlocks"/>
         <module name="EmptyBlock"/>
+        <module name="EmptyCatchBlock"/>
         <module name="LeftCurly"/>
         <module name="NeedBraces"/>
         <module name="RightCurly"/>
 
-        <!-- See http://checkstyle.sf.net/config_design.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_design.html -->
         <module name="VisibilityModifier">
             <property name="protectedAllowed" value="true"/>
         </module>
 
-        <!-- See http://checkstyle.sf.net/config_coding.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_coding.html -->
+        <module name="AvoidDoubleBraceInitialization"/>
         <module name="AvoidInlineConditionals"/>
+        <module name="AvoidNoArgumentSuperConstructorCall"/>
         <module name="DeclarationOrder"/>
+        <module name="DefaultComesLast"/>
         <module name="EmptyStatement"/>
         <module name="FallThrough"/>
         <module name="InnerAssignment"/>
         <module name="ModifiedControlVariable"/>
+        <module name="MultipleVariableDeclarations"/>
         <module name="OneStatementPerLine"/>
         <module name="ParameterAssignment"/>
-        <module name="RequireThis">
-<!--
-            <property name="checkMethods" value="false"/>
-            <property name="validateOnlyOverlapping" value="false"/>
--->
+        <module name="RequireThis"/>
+        <module name="ReturnCount">
+            <property name="format" value="^$"/>
         </module>
         <module name="SimplifyBooleanExpression"/>
         <module name="SimplifyBooleanReturn"/>
         <module name="StringLiteralEquality"/>
         <module name="UnnecessaryParentheses"/>
 
-        <!-- See http://checkstyle.sf.net/config_imports.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_imports.html -->
         <module name="AvoidStarImport">
-            <property name="excludes" value="org.junit.Assert"/>
+            <property name="excludes" value="org.junit.jupiter.api.Assertions,org.junit.Assert"/>
         </module>
         <module name="AvoidStaticImport">
-            <property name="excludes" value="org.junit.Assert.*"/>
+            <property name="excludes" value="org.junit.jupiter.api.Assertions.*,org.junit.Assert.*"/>
         </module>
         <module name="IllegalImport"/>
         <module name="RedundantImport"/>
         <module name="UnusedImports"/>
 
-        <!-- See http://checkstyle.sf.net/config_javadoc.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_javadoc.html -->
         <module name="AtclauseOrder"/>
+        <module name="InvalidJavadocPosition"/>
+        <module name="JavadocBlockTagLocation"/>
+        <module name="JavadocContentLocation"/>
+        <module name="JavadocMethod"/>
+        <module name="JavadocMissingWhitespaceAfterAsterisk"/>
         <module name="JavadocStyle"/>
+        <module name="JavadocType">
+           <property name="authorFormat" value="\S"/>
+           <property name="versionFormat" value="\S"/>
+        </module>
+        <module name="MissingJavadocMethod">
+            <property name="scope" value="private"/>
+            <property name="allowMissingPropertyJavadoc" value="true"/>
+        </module>
+        <module name="MissingJavadocType">
+            <property name="scope" value="private"/>
+        </module>
         <module name="NonEmptyAtclauseDescription"/>
+        <module name="SummaryJavadocCheck"/>
 
-        <!-- See http://checkstyle.sf.net/config_misc.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_misc.html -->
         <module name="ArrayTypeStyle"/>
         <module name="CommentsIndentation"/>
         <module name="Indentation">
             <property name="basicOffset" value="4"/>
             <property name="braceAdjustment" value="0"/>
             <property name="caseIndent" value="4"/>
+            <property name="throwsIndent" value="4"/>
             <property name="arrayInitIndent" value="8"/>
+            <property name="lineWrappingIndentation" value="4"/>
         </module>
         <property name="tabWidth" value="4"/>
+        <module name="OuterTypeFilename"/>
         <module name="UpperEll"/>
 
-        <!-- See http://checkstyle.sf.net/config_modifiers.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_modifiers.html -->
         <module name="ModifierOrder"/>
         <module name="RedundantModifier"/>
 
-        <!-- See http://checkstyle.sf.net/config_naming.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_naming.html -->
+        <module name="CatchParameterName"/>
         <module name="ConstantName"/>
         <module name="LocalFinalVariableName">
             <property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
@@ -92,42 +117,38 @@ Checkstyle configuration for Think Java, 2nd Edition.
         <module name="StaticVariableName"/>
         <module name="TypeName"/>
 
-        <!-- See http://checkstyle.sf.net/config_regexp.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_regexp.html -->
         <module name="Regexp">
             <property name="format" value=" //[^ ]"/>
             <property name="illegalPattern" value="true"/>
             <message key="illegal.regexp" value="missing space after ''//'' in comment."/>
         </module>
 
-        <!-- See http://checkstyle.sf.net/config_sizes.html -->
-        <module name="LineLength"/>
+        <!-- See https://checkstyle.sourceforge.io/config_sizes.html -->
         <module name="MethodLength"/>
 
-        <!-- See http://checkstyle.sf.net/config_whitespace.html -->
+        <!-- See https://checkstyle.sourceforge.io/config_whitespace.html -->
         <module name="EmptyLineSeparator">
             <property name="allowNoEmptyLineBetweenFields" value="true"/>
         </module>
+        <module name="GenericWhitespace"/>
         <module name="MethodParamPad"/>
         <module name="NoWhitespaceAfter"/>
         <module name="NoWhitespaceBefore"/>
         <module name="OperatorWrap"/>
         <module name="ParenPad"/>
+        <module name="SeparatorWrap"/>
         <module name="TypecastParenPad"/>
         <module name="WhitespaceAfter"/>
         <module name="WhitespaceAround"/>
 
     </module>
 
-    <!-- See http://checkstyle.sf.net/config_misc.html -->
-<!--
-    <module name="NewlineAtEndOfFile">
-      <property name="lineSeparator" value="lf_cr_crlf"/>
-    </module>
--->
-    <!-- See http://checkstyle.sf.net/config_sizes.html -->
+    <!-- See https://checkstyle.sourceforge.io/config_sizes.html -->
     <module name="FileLength"/>
+    <module name="LineLength"/>
 
-    <!-- See http://checkstyle.sf.net/config_whitespace.html -->
+    <!-- See https://checkstyle.sourceforge.io/config_whitespace.html -->
     <module name="FileTabCharacter"/>
 
 </module>
diff --git a/Formatter.xml b/Formatter.xml
index f97740d..a16cdb8 100644
--- a/Formatter.xml
+++ b/Formatter.xml
@@ -1,318 +1,390 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<profiles version="14">
-<profile kind="CodeFormatterProfile" name="Think Java, 2nd Edition" version="14">
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_ellipsis" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_enum_declarations" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_in_empty_annotation_declaration" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_allocation_expression" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_at_in_annotation_type_declaration" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_for_statment" value="common_lines"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.new_lines_at_block_boundaries" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_constructor_declaration_parameters" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.insert_new_line_for_parameter" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_package" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_method_invocation" value="common_lines"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_enum_constant" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.blank_lines_after_imports" value="1"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_while" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.insert_new_line_before_root_tags" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_annotation_type_member_declaration" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_method_declaration_throws" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_switch_statement" value="common_lines"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.format_javadoc_comments" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.indentation.size" value="4"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_postfix_operator" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_enum_constant_declaration" value="common_lines"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_for_increments" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_type_arguments" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_for_inits" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_in_empty_anonymous_type_declaration" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_semicolon_in_for" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.align_with_spaces" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.disabling_tag" value="@formatter:off"/>
-<setting id="org.eclipse.jdt.core.formatter.continuation_indentation" value="2"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_enum_constants" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.blank_lines_before_imports" value="1"/>
-<setting id="org.eclipse.jdt.core.formatter.blank_lines_after_package" value="1"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_binary_operator" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_multiple_local_declarations" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_if_while_statement" value="common_lines"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_enum_constant" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_angle_bracket_in_parameterized_type_reference" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.indent_root_tags" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.wrap_before_or_operator_multicatch" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.enabling_tag" value="@formatter:on"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_closing_brace_in_block" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.count_line_length_from_starting_position" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_return" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_method_declaration" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_parameter" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.keep_then_statement_on_same_line" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_field" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_explicitconstructorcall_arguments" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_in_empty_block" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_prefix_operator" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.blank_lines_between_type_declarations" value="1"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_brace_in_array_initializer" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_for" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_catch" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_angle_bracket_in_type_arguments" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_method" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_switch" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_parameterized_type_references" value="0"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_anonymous_type_declaration" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_parenthesized_expression" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_enum_constant" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.never_indent_line_comments_on_first_column" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_and_in_type_parameter" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_for_inits" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.indent_statements_compare_to_block" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.brace_position_for_anonymous_type_declaration" value="end_of_line"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_question_in_wildcard" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_annotation" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_method_invocation_arguments" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_switch" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.align_tags_descriptions_grouped" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.line_length" value="80"/>
-<setting id="org.eclipse.jdt.core.formatter.use_on_off_tags" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_brackets_in_array_allocation_expression" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_enum_constant" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_invocation" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_assignment_operator" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_type_declaration" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_for" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.preserve_white_space_between_code_and_line_comments" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_local_variable" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.brace_position_for_method_declaration" value="end_of_line"/>
-<setting id="org.eclipse.jdt.core.formatter.align_variable_declarations_on_columns" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_method_invocation" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_union_type_in_multicatch" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_colon_in_for" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_method_body" value="0"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_closing_angle_bracket_in_type_arguments" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.keep_else_statement_on_same_line" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_binary_expression" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_catch_clause" value="common_lines"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_parameterized_type_reference" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_array_initializer" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_multiple_field_declarations" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_annotation" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_explicit_constructor_call" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_annotation_declaration_header" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_superinterfaces" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_default" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_question_in_conditional" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.brace_position_for_block" value="end_of_line"/>
-<setting id="org.eclipse.jdt.core.formatter.brace_position_for_constructor_declaration" value="end_of_line"/>
-<setting id="org.eclipse.jdt.core.formatter.brace_position_for_lambda_body" value="end_of_line"/>
-<setting id="org.eclipse.jdt.core.formatter.compact_else_if" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_type_parameters" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_catch" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_method_invocation" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.put_empty_statement_on_new_line" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_parameters_in_constructor_declaration" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_type_parameters" value="0"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_method_invocation_arguments" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_method_invocation" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_constructor_declaration" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_compact_loops" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.clear_blank_lines_in_block_comment" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_catch_in_try_statement" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_try" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.keep_simple_for_body_on_same_line" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_at_end_of_file_if_missing" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.clear_blank_lines_in_javadoc_comment" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_array_initializer" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_binary_operator" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_unary_operator" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_expressions_in_array_initializer" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.format_line_comment_starting_on_first_column" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.number_of_empty_lines_to_preserve" value="1"/>
-<setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_annotation" value="common_lines"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_colon_in_case" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_ellipsis" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_semicolon_in_try_resources" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_colon_in_assert" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_if" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_type_arguments" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_and_in_type_parameter" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_in_empty_type_declaration" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_parenthesized_expression" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.format_line_comments" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_colon_in_labeled_statement" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.align_type_members_on_columns" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_assignment" value="0"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_module_statements" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_in_empty_method_body" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_type_header" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_declaration" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.align_tags_names_descriptions" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_enum_constant" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_superinterfaces_in_type_declaration" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.blank_lines_before_first_class_body_declaration" value="0"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_conditional_expression" value="80"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_closing_brace_in_array_initializer" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_constructor_declaration_parameters" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.format_guardian_clause_on_one_line" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_if" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.align_assignment_statements_on_columns" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_type" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_block" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.brace_position_for_enum_declaration" value="end_of_line"/>
-<setting id="org.eclipse.jdt.core.formatter.brace_position_for_block_in_case" value="end_of_line"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_constructor_declaration" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.comment.format_header" value="false"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_allocation_expression" value="16"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_method_invocation" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_while" value="insert"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_switch" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.alignment_for_method_declaration" value="0"/>
-<setting id="org.eclipse.jdt.core.formatter.join_wrapped_lines" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_constructor_declaration" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.formatter.wrap_before_conditional_operator" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.indent_switchstatements_compare_to_cases" value="true"/>
-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_bracket_in_array_allocation_expression" value="do not insert"/>
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-<setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_switch" value="insert"/>
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+    <profile kind="CodeFormatterProfile" name="Think Java, 2nd Edition" version="20">
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_ellipsis" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_enum_declarations" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_allocation_expression" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_for_statment" value="common_lines"/>
+        <setting id="org.eclipse.jdt.core.formatter.comment.new_lines_at_block_boundaries" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_constructor_declaration_parameters" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.comment.insert_new_line_for_parameter" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_package" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_enum_constant" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_while" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_annotation_type_member_declaration" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.comment.format_javadoc_comments" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.indentation.size" value="4"/>
+        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_enum_constant_declaration" value="common_lines"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_semicolon_in_for" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.align_with_spaces" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.continuation_indentation" value="2"/>
+        <setting id="org.eclipse.jdt.core.formatter.number_of_blank_lines_before_code_block" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_switch_case_expressions" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.blank_lines_after_package" value="1"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_multiple_local_declarations" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_enum_constant" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_angle_bracket_in_parameterized_type_reference" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.comment.indent_root_tags" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.wrap_before_or_operator_multicatch" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.enabling_tag" value="@formatter:on"/>
+        <setting id="org.eclipse.jdt.core.formatter.comment.count_line_length_from_starting_position" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_record_components" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_method_declaration" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_parameter" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.wrap_before_multiplicative_operator" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_then_statement_on_same_line" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_explicitconstructorcall_arguments" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_prefix_operator" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_brace_in_array_initializer" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_angle_bracket_in_type_arguments" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_method" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_parameterized_type_references" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_logical_operator" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_parenthesized_expression" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_annotation_declaration_on_one_line" value="one_line_never"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_record_declaration" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_enum_constant" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_multiplicative_operator" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_and_in_type_parameter" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_invocation" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_assignment_operator" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_type_declaration" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_for" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.comment.preserve_white_space_between_code_and_line_comments" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_local_variable" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_abstract_method" value="1"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_enum_constant_declaration_on_one_line" value="one_line_never"/>
+        <setting id="org.eclipse.jdt.core.formatter.align_variable_declarations_on_columns" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_method_invocation" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_union_type_in_multicatch" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_method_body" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_else_statement_on_same_line" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_catch_clause" value="common_lines"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_parameterized_type_reference" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_array_initializer" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_annotation" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_explicit_constructor_call" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_multiplicative_operator" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_anonymous_type_declaration_on_one_line" value="one_line_never"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_switch_case_expressions" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.wrap_before_shift_operator" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_annotation_declaration_header" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.brace_position_for_block" value="end_of_line"/>
+        <setting id="org.eclipse.jdt.core.formatter.number_of_blank_lines_at_end_of_code_block" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_bitwise_operator" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.put_empty_statement_on_new_line" value="true"/>
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+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_arrow_in_switch_default" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.comment.insert_new_line_between_different_tags" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_additive_operator" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_method_invocation" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_while" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.join_wrapped_lines" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_constructor_declaration" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_annotations_on_field" value="49"/>
+        <setting id="org.eclipse.jdt.core.formatter.wrap_before_conditional_operator" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.indent_switchstatements_compare_to_cases" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_bracket_in_array_allocation_expression" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_synchronized" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_shift_operator" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.use_tabs_only_for_leading_indentations" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_try_clause" value="common_lines"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_code_block_on_one_line" value="one_line_never"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_constructor_declaration_throws" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_record_components" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.tabulation.size" value="4"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_bitwise_operator" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_bracket_in_array_reference" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_colon_in_conditional" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_try" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_semicolon_in_try_resources" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.continuation_indentation_for_array_initializer" value="2"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_question_in_wildcard" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_record_declaration" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_superinterfaces_in_enum_declaration" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.wrap_before_assignment_operator" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_labeled_statement" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.brace_position_for_switch" value="end_of_line"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_superinterfaces" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_method_declaration_parameters" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_closing_angle_bracket_in_type_parameters" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_lambda_body_block_on_one_line" value="one_line_never"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_annotations_on_method" value="49"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_parameterized_type_reference" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_record_constructor_on_one_line" value="one_line_never"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_record_declaration" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_empty_array_initializer_on_one_line" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_assertion_message" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_constructor_declaration" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_new_chunk" value="1"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_bracket_in_array_allocation_expression" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_constructor_declaration" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_angle_bracket_in_parameterized_type_reference" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_angle_bracket_in_type_arguments" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_assert" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_member_type" value="1"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_logical_operator" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_qualified_allocation_expression" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_superinterfaces_in_record_declaration" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_if" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_semicolon" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.wrap_before_relational_operator" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_postfix_operator" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_angle_bracket_in_type_arguments" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_cast" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.comment.format_block_comments" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.alignment_for_parameters_in_method_declaration" value="16"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_method_declaration_throws" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.blank_lines_after_last_class_body_declaration" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.indent_statements_compare_to_body" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_simple_while_body_on_same_line" value="false"/>
+        <setting id="org.eclipse.jdt.core.formatter.wrap_before_logical_operator" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.blank_lines_between_statement_group_in_switch" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_bracket_in_array_reference" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_annotation" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_enum_constant_arguments" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_lambda_declaration" value="common_lines"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_case" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_bracket_in_array_reference" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.keep_enum_declaration_on_one_line" value="one_line_never"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_method_declaration" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.brace_position_for_enum_constant" value="end_of_line"/>
+        <setting id="org.eclipse.jdt.core.formatter.brace_position_for_type_declaration" value="end_of_line"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_multiplicative_operator" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_package" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_for" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_for_increments" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_enum_constant" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_explicitconstructorcall_arguments" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_annotation" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_enum_constant_header" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_constructor_declaration" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_constructor_declaration_throws" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_angle_bracket_in_type_parameters" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_question_in_conditional" value="insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.comment.indent_parameter_description" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_code_block" value="0"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_finally_in_try_statement" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.tabulation.char" value="space"/>
+        <setting id="org.eclipse.jdt.core.formatter.wrap_before_string_concatenation" value="true"/>
+        <setting id="org.eclipse.jdt.core.formatter.lineSplit" value="80"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_annotation" value="do not insert"/>
+        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_switch" value="insert"/>
+    </profile>
 </profiles>
diff --git a/user.dict b/user.dict
new file mode 100644
index 0000000..11b2406
--- /dev/null
+++ b/user.dict
@@ -0,0 +1,2 @@
+chris
+mayfield

From c215058330addb5206b3def6e1ad038058c72fdb Mon Sep 17 00:00:00 2001
From: Chris Mayfield <mayfiecs@jmu.edu>
Date: Sat, 30 Jan 2021 13:42:29 -0500
Subject: [PATCH 8/9] tidy up Ch15

---
 ch15/Cell.java       | 15 +++++++++++----
 ch15/Conway.java     |  5 +++--
 ch15/GridCanvas.java |  9 +++++++++
 3 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/ch15/Cell.java b/ch15/Cell.java
index d468b6d..5b6a0f9 100644
--- a/ch15/Cell.java
+++ b/ch15/Cell.java
@@ -3,6 +3,9 @@
 
 /**
  * A square at a fixed location that changes color.
+ * 
+ * @author Chris Mayfield
+ * @version 7.1.0
  */
 public class Cell {
 
@@ -40,28 +43,32 @@ public void draw(Graphics g) {
     }
 
     /**
-     * @return true if the cell is OFF
+     * Tests whether the cell is off.
+     * 
+     * @return true if the cell is off
      */
     public boolean isOff() {
         return state == 0;
     }
 
     /**
-     * @return true if the cell is ON
+     * Tests whether the cell is on.
+     * 
+     * @return true if the cell is on
      */
     public boolean isOn() {
         return state == 1;
     }
 
     /**
-     * Sets the cell's state to OFF.
+     * Sets the cell's state to off.
      */
     public void turnOff() {
         state = 0;
     }
 
     /**
-     * Sets the cell's state to ON.
+     * Sets the cell's state to on.
      */
     public void turnOn() {
         state = 1;
diff --git a/ch15/Conway.java b/ch15/Conway.java
index 93faf28..5ac48c6 100644
--- a/ch15/Conway.java
+++ b/ch15/Conway.java
@@ -2,6 +2,9 @@
 
 /**
  * Conway's Game of Life.
+ * 
+ * @author Chris Mayfield
+ * @version 7.1.0
  */
 public class Conway {
 
@@ -109,8 +112,6 @@ public void update() {
 
     /**
      * The simulation loop.
-     * 
-     * @param rate frames per second
      */
     private void mainloop() {
         while (true) {
diff --git a/ch15/GridCanvas.java b/ch15/GridCanvas.java
index c936135..3856a57 100644
--- a/ch15/GridCanvas.java
+++ b/ch15/GridCanvas.java
@@ -3,6 +3,9 @@
 
 /**
  * 2D array of cells representing a rectangular grid.
+ * 
+ * @author Chris Mayfield
+ * @version 7.1.0
  */
 public class GridCanvas extends Canvas {
 
@@ -33,6 +36,8 @@ public GridCanvas(int rows, int cols, int size) {
     }
 
     /**
+     * Gets the number of rows.
+     * 
      * @return number of rows
      */
     public int numRows() {
@@ -40,6 +45,8 @@ public int numRows() {
     }
 
     /**
+     * Gets the number of columns.
+     * 
      * @return number of columns
      */
     public int numCols() {
@@ -47,6 +54,8 @@ public int numCols() {
     }
 
     /**
+     * Gets the cell at index (r, c).
+     * 
      * @param r row index
      * @param c column index
      * @return the cell

From a15b84d85862d0e3236fc0fe8655526a340b1856 Mon Sep 17 00:00:00 2001
From: Chris Mayfield <mayfiecs@jmu.edu>
Date: Fri, 20 Aug 2021 10:32:04 -0400
Subject: [PATCH 9/9] Checkstyle 8.44, Eclipse 2021-06

---
 Checkstyle.xml | 3 ++-
 Formatter.xml  | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Checkstyle.xml b/Checkstyle.xml
index 6788535..36dbd1f 100644
--- a/Checkstyle.xml
+++ b/Checkstyle.xml
@@ -4,7 +4,7 @@
     "https://checkstyle.org/dtds/configuration_1_3.dtd">
 
 <!--
-Checkstyle configuration for Think Java, 2nd Edition.
+Checkstyle 8.44 configuration for Think Java, 2nd Edition.
 -->
 <module name="Checker">
     <property name="severity" value="warning"/>
@@ -82,6 +82,7 @@ Checkstyle configuration for Think Java, 2nd Edition.
             <property name="scope" value="private"/>
         </module>
         <module name="NonEmptyAtclauseDescription"/>
+        <module name="RequireEmptyLineBeforeBlockTagGroup"/>
         <module name="SummaryJavadocCheck"/>
 
         <!-- See https://checkstyle.sourceforge.io/config_misc.html -->
diff --git a/Formatter.xml b/Formatter.xml
index a16cdb8..ab6e68e 100644
--- a/Formatter.xml
+++ b/Formatter.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<profiles version="20">
-    <profile kind="CodeFormatterProfile" name="Think Java, 2nd Edition" version="20">
+<profiles version="21">
+    <profile kind="CodeFormatterProfile" name="Think Java, 2nd Edition" version="21">
         <setting id="org.eclipse.jdt.core.formatter.insert_space_after_ellipsis" value="insert"/>
         <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_enum_declarations" value="insert"/>
         <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_allocation_expression" value="do not insert"/>