Java Example - Array Intersection

The following example demonstrates how to use the removeAll () method to delete array elements contained in another array:

/*
 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 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);
   }}

The output result of running the above code is:

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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