查找数组中重复数据索引

[xiaodeme]

有这样一个数组
String[] arr = {10,20,45,20,10,50,50};
然后查找出重复数据的索引号
结果 0,1,3,4,5,6

[xiaodeme]

问题出现了
String[] arr = {"小A","小B","小A","小D","小E","小E"}
结果：0,2,4,5
这样的数据得不到重复的索引呀

[xiaodeme]

晕 自己看错了……

[xiaodeme]

真是无语了……
还是没错误的
String[] arr = { "小张", "小林", "小黑", "小白", "小唐"};int count = 0;
String str = "";
System.out.println("重复数据索引:");
for (int i = 0; i < arr.length; i++) {

for (int j = 0; j < arr.length; j++) {

if (arr[i].equals(arr[j])) {
count++;

}
}
if (count > 1) {

System.out.println(i);
count = 0;
}

[kick5578]

嵌套循环应该可以

[xiaodeme]

楼上的兄弟 ，能不能具体的代码写出来呢……

[xiaodeme]

int[] arr = {10,20,45,20,10,50,50};

[zn85600301]

2个 for循环的事情

[andesen]

int[] arr = {10,20,45,20,10,50,50};  
		for(int i=0;i<arr.length;i++)
		{
			int tmp =arr[i];
			for(int j=i+1;j<arr.length;j++)
			{
				if(arr[j]==tmp)
				{
					System.out.println(i);
					System.out.println(j);
					break;
				}
			}
		}

[whut_lcy]

String[]   arr   =   {"10","20","45","20","10","50","50"};
		int count = 0;
		System.out.println("重复数据索引:");
		for(int i = 0; i < arr.length; i++){
			
			for(int j = 0; j < arr.length; j++){
				
				if(arr[i] == arr[j]){
					
					count++;
				}
				
			}
			
			if(count > 1){
				
				System.out.println(i);
				count = 0;
			}
		}

[whut_lcy]

双重循环，代码效率低了些

[xiaodeme]

太谢谢楼上的朋友啦……
今天上午可以提前完成任务了

[xianaofei]

String[] arr = {"10","20","45","20","10","50","50"}; int count = 0; System.out.println("重复数据索引:"); for(int i = 0; i < arr.length; i++){ for(int j = 0; j < arr.length; j++){ if(arr[i] == arr[j]){ count++; } } if(count > 1){ System.out.println(i); count = 0; } }