Leetcode Summary Ranges

public class Solution {
    public List<String> summaryRanges(int[] nums) {
        List<String> result = new ArrayList<String>();
        if(nums == null || nums.length == 0){
            return result;
        }
        int left = nums[0];
        int right = 0;
        for(int i = 1; i < nums.length; i++){
            if(nums[i] - nums[i-1] != 1){
                right = nums[i-1];
                if(left == right){
                    result.add("" + left);
                }else {
                    result.add(left + "->"+right);
                }
                left = nums[i];
            }
        }
        right = nums[nums.length-1];
        if(left == right){
            result.add("" + left);
        }else {
            result.add(left + "->"+right);
        }
        return result;
    }
}