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November 16, 2019 13:08
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束縛された変数どうなってるん?ってことで可変クラス作って中身を変更してみました。
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//パッケージ略 | |
import java.util.function.Supplier; | |
/** | |
* クロージャテスト | |
*/ | |
public class ClosureTest { | |
/** | |
* 可変データクラス | |
*/ | |
private static class Data { | |
/** | |
* int型可変データ | |
*/ | |
public int num; | |
public Data(int num) { this.num = num; } | |
} | |
/** | |
* | |
* @param data 生成するデータ | |
* @return dataを生成するSupplier | |
*/ | |
private static Supplier<Data> supplyData(Data data) { | |
return () -> data; | |
} | |
public static void main(String[] args) { | |
Data originalData = new Data(1); | |
Supplier<Data> dataSupplier1 = supplyData(originalData); | |
Supplier<Data> dataSupplier2 = supplyData(originalData); | |
Data data1 = dataSupplier1.get(); | |
Data data2 = dataSupplier2.get(); | |
System.out.println("[data1]" + data1.num); | |
System.out.println("[data2]" + data2.num); | |
System.out.println(); | |
System.out.println("change data2: num = 2"); | |
data2.num = 2; | |
System.out.println(); | |
System.out.println("[data1]" + data1.num); | |
System.out.println("[data2]" + data2.num); | |
System.out.println(); | |
System.out.println("change original: num = 3"); | |
originalData.num = 3; | |
System.out.println(); | |
System.out.println("[data1]" + data1.num); | |
System.out.println("[data2]" + data2.num); | |
} | |
} | |
/* | |
以下main実行結果 | |
[data1]1 | |
[data2]1 | |
change data2: num = 2 | |
[data1]2 | |
[data2]2 | |
change original: num = 3 | |
[data1]3 | |
[data2]3 | |
*/ |
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