LeetCode 217. Contains Duplicate

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