The following example demonstrates how to use the removeAll () method to calculate the difference between two arrays:
/*
author by w3cschool.cc
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 的元素" +objArray);
System.out.println("array2 的元素" +objArray2);
objArray.removeAll(objArray2);
System.out.println("array1 与 array2 数组差集为："+objArray);
}}The output result of running the above code is:
array1 的元素[common1, common2, notcommon2] array2 的元素[common1, common2, notcommon, notcommon1] array1 与 array2 数组差集为：[notcommon2]
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