java快速找出数组或集合中重复的元素

1.测试方法如下

public class TestArrayRepeat {public static void main(String[] args) {String [] idArr= {"12171112357750","07171424092222","05181734449919","05181734449919","02141641601540","07171440085767","06281619452764","02141641601540","02181444500130","05181734449919"};findDupicateIdArray(idArr);}public static void findDupicateIdArray(String[] idArr) {int count=0;for(int j=0;j<idArr.length;j++) {for(int k =j+1;k<idArr.length;k++) {if(idArr[j].equals(idArr[k])) {count++;}}if(count==1)System.out.println( "重复元素: " + idArr[j] );count = 0;}}}

2.运行结果如下