以下实例演示了如何使用 removeAll () 方法来计算两个数组的差集:
/* author by itshubao.com 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); } }
以上代码运行输出结果为:
array1 的元素[common1, common2, notcommon2] array2 的元素[common1, common2, notcommon, notcommon1] array1 与 array2 数组差集为:[notcommon2]