Java 實例 - 數組交集
Java 實例以下實例演示了如何使用 retainAll () 方法來計算兩個數組的交集：
Main.java 檔
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]