Java 實例 - 數組交集

Java 實例

以下實例演示了如何使用 removeAll () 方法來刪除包含在另外一個數組中的數組元素：

/*
 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 數組元素："+objArray);
      System.out.println("array2 數組元素："+objArray2);
      objArray.retainAll(objArray2);
      System.out.println("array2 & array1 數組交集為："+objArray);
   }
}

以上代碼運行輸出結果為：

array1 數組元素：[common1, common2, notcommon2]
array2 數組元素：[common1, common2, notcommon, notcommon1]
array2 & array1 數組交集為：[common1, common2]

Java 實例