查找数组中出现次数超过一半的数字

package test;
public class Test3 {
static int solve(int[] arr,int len){
int index = -1;
int mid = (len)/2;
int low = 0;
int high = len-1;
while(index != mid){
index = partition(arr, low, high);
if(index == mid) break;
if(index>mid){
high = index-1;
}else{
low = index+1;
}
}
return arr[mid];
}
static int partition(int[] arr,int low,int high){
int flag = arr[low];
while(low<high){
while(low<high && arr[high]>=flag) high--;
arr[low] = arr[high];
while(low<high && arr[low] <= flag) low++;
arr[high] = arr[low];
}
arr[low] = flag;
return low;
}
public static void main(String[] args) {
int[] arr = new int[]{1,2,3,2,2,2,5,4,2};
System.out.println(solve(arr, arr.length));
}
}

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