题解 | #数组中重复的数字#

import java.util.*;
public class Solution {
    public int duplicate (int[] nums) {
        Arrays.sort(nums);
        for(int i=0;i<nums.length;){
            if(nums[i]!=nums[i+1]){
                i++;
            }else{
                return nums[i];
            }
        }
        return -1;    
    }
}