Java 数组交集的实现代码

以下实例演示了如何使用 retainAll () 方法来计算两个数组的交集:

Main.java 文件:

import java.util.ArrayList;

public class Main {

public static void main(String[] args) {

ArrayList objArray = new ArrayList();

ArrayList objArray2 = new ArrayList();

objArray2.add(0,"common1");

objArray2.add(1,"common2");

objArray2.add(2,"notcommon");

objArray2.add(3,"notcommon1");

objArray.add(0,"common1");

objArray.add(1,"common2");

objArray.add(2,"notcommon2");

System.out.println("array1 数组元素:"+objArray);

System.out.println("array2 数组元素:"+objArray2);

objArray.retainAll(objArray2);

System.out.println("array2 & array1 数组交集为:"+objArray);

}

}

以上代码运行输出结果为:

array1 数组元素:[common1, common2, notcommon2]

array2 数组元素:[common1, common2, notcommon, notcommon1]

array2 & array1 数组交集为:[common1, common2]

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