合并连续数字的算法

public class Test {public static void main(String[] args) {String str = new String("1,2,3,4,5,6,7,8,9,11,13,14,1000,1001,1002,1003");String[] s = str.split(",");int[] num = new int[s.length];String result = "";for (int i = 0; i < s.length; i++) {num[i] = Integer.parseInt(s[i]);}for (int i = 0; i < num.length; i++) {if (i == 0) {result = "" + num[i];} else if (i == num.length - 1) {if (num[i] - num[i - 1] == 1) {result = result + "-" + num[i];} else {result = result + "," + num[i];}} else {if ((num[i] - num[i - 1] == 1) && (num[i + 1] - num[i] == 1)) {continue;}if ((num[i] - num[i - 1] == 1) && (num[i + 1] - num[i] != 1)) {result = result + "-" + num[i];}if ((num[i] - num[i - 1] != 1)) {result = result + "," + num[i];}}}System.out.println(result);}}