Contains Duplicate

1. Title

Contains Duplicate

2. Http address

https://leetcode.com/problems/contains-duplicate/

3. The question

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.

4. My code(AC)

 1     // Accepted
 2     public static boolean containsDuplicate(int[] nums) {
 3     
 4         if ( nums == null || nums.equals(""))
 5             return false;
 6         Arrays.sort(nums);
 7         int len = nums.length;
 8         for( int i = 1 ; i < len ; i++)
 9         {
10             if( nums[i] == nums[i-1])
11                 return true;
12         }
13         return false;
14     }