(easy)LeetCode 217.Contains Duplicate

Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct.

代码如下：

public class Solution {
    public boolean containsDuplicate(int[] nums) {
        Set<Integer> set=new HashSet<Integer>();
        int len=nums.length;
         for(int i=0;i<len;i++){
             set.add(nums[i]);
         }
         if(len>set.size())
            return true;
         else
            return false;
    }
}

　　运行结果：