LeetCode: Determine whether there are the same elements in an integer array

Title description

Given an integer array, determine whether there are duplicate elements.

If there is a value that appears at least twice in the array, the function returns true. If each element in the array is different, then return false.

Ideas

• Sort the array first (Arrays.sort(XX))
• Determine whether adjacent elements are equal

Code

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