Solution228.java

import java.util.ArrayList;
import java.util.List;

public class Solution228 {
 public List<String> summaryRanges(int[] nums) {
 List ans = new ArrayList();
 int length = nums.length;

 int l = 0;
 int r = 0;

 while (r < length) {
 while (r < length - 1 && nums[r] + 1 == nums[r + 1]) {
 ++r;
 }
 if (l != r) {
 ans.add(Integer.toString(nums[l]) + "->" + Integer.toString(nums[r]));
 } else {
 ans.add(Integer.toString(nums[l]));
 }
 ++r;
 l = r;
 }
 return ans;
 }

 public static void main(String[] args) {
 Solution228 solution228 = new Solution228();
 int[] nums = new int[]{0,2,3,4,6,8,9};
 System.out.println(solution228.summaryRanges(nums));
 }
}