leetCode 217. Contains Duplicate in java

class Solution {
    public boolean containsDuplicate(int[] nums) {
        Arrays.sort(nums);
        if (nums.length ==1) return false;
        else if (nums[0]==nums[1] ) return true;
        for (int i=1; i<nums.length-1; i++){
            if(nums[i] == nums [i+1] || nums[i] == nums [i-1] ) return true;
        }
        return false;
    }
}