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src/effectivejava/chapter6/item37/Plant.java

Lines changed: 13 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -3,9 +3,9 @@
33
import static java.util.stream.Collectors.groupingBy;
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import static java.util.stream.Collectors.toSet;
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6-
// Using an EnumMap to associate data with an enum (Pages 171-3)
6+
// EnumMap을 사용해 열거 타입에 데이터를 연관시키기 (226-228쪽)
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8-
// Simplistic class representing a plant (Page 171)
8+
// 식물을 아주 단순하게 표현한 클래스 (226쪽)
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class Plant {
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enum LifeCycle { ANNUAL, PERENNIAL, BIENNIAL }
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@@ -23,28 +23,28 @@ enum LifeCycle { ANNUAL, PERENNIAL, BIENNIAL }
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public static void main(String[] args) {
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Plant[] garden = {
26-
new Plant("Basil", LifeCycle.ANNUAL),
27-
new Plant("Carroway", LifeCycle.BIENNIAL),
28-
new Plant("Dill", LifeCycle.ANNUAL),
29-
new Plant("Lavendar", LifeCycle.PERENNIAL),
30-
new Plant("Parsley", LifeCycle.BIENNIAL),
31-
new Plant("Rosemary", LifeCycle.PERENNIAL)
26+
new Plant("바질", LifeCycle.ANNUAL),
27+
new Plant("캐러웨이", LifeCycle.BIENNIAL),
28+
new Plant("딜", LifeCycle.ANNUAL),
29+
new Plant("라벤더", LifeCycle.PERENNIAL),
30+
new Plant("파슬리", LifeCycle.BIENNIAL),
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new Plant("로즈마리", LifeCycle.PERENNIAL)
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};
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34-
// Using ordinal() to index into an array - DON'T DO THIS! (Page 171)
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// 코드 37-1 ordinal()을 배열 인덱스로 사용 - 따라 하지 말 것! (226쪽)
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Set<Plant>[] plantsByLifeCycleArr =
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(Set<Plant>[]) new Set[Plant.LifeCycle.values().length];
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for (int i = 0; i < plantsByLifeCycleArr.length; i++)
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plantsByLifeCycleArr[i] = new HashSet<>();
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for (Plant p : garden)
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plantsByLifeCycleArr[p.lifeCycle.ordinal()].add(p);
41-
// Print the results
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// 결과 출력
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for (int i = 0; i < plantsByLifeCycleArr.length; i++) {
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System.out.printf("%s: %s%n",
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Plant.LifeCycle.values()[i], plantsByLifeCycleArr[i]);
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}
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47-
// Using an EnumMap to associate data with an enum (Page 172)
47+
// 코드 37-2 EnumMap을 사용해 데이터와 열거 타입을 매핑한다. (227쪽)
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Map<Plant.LifeCycle, Set<Plant>> plantsByLifeCycle =
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new EnumMap<>(Plant.LifeCycle.class);
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for (Plant.LifeCycle lc : Plant.LifeCycle.values())
@@ -53,11 +53,11 @@ public static void main(String[] args) {
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plantsByLifeCycle.get(p.lifeCycle).add(p);
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System.out.println(plantsByLifeCycle);
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56-
// Naive stream-based approach - unlikely to produce an EnumMap! (Page 172)
56+
// 코드 37-3 스트림을 사용한 코드 1 - EnumMap을 사용하지 않는다! (228쪽)
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System.out.println(Arrays.stream(garden)
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.collect(groupingBy(p -> p.lifeCycle)));
5959

60-
// Using a stream and an EnumMap to associate data with an enum (Page 173)
60+
// 코드 37-4 스트림을 사용한 코드 2 - EnumMap을 이용해 데이터와 열거 타입을 매핑했다. (228쪽)
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System.out.println(Arrays.stream(garden)
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.collect(groupingBy(p -> p.lifeCycle,
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() -> new EnumMap<>(LifeCycle.class), toSet())));

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