Java 实例 - 数组交集

以下实例演示了如何使用 removeAll () 方法来删除包含在另外一个数组中的数组元素：

/*

author by w3cschool.cn

文件名：Main.java

*/

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]