用递归的方法算出给定字符串的最大连续重复字符的重复次数

 1 package com.yan.test01;
 2 
 3 public class LongestSubString {
 4 
 5     // 用递归的方法算出给定字符串的最大连续重复字符的重复次数
 6     public LongestSubString() {
 7     }
 8 
 9     public static int maxLength(String str, int position, int count, int maxLength) {
10 
11         if (position == str.length()) {
12             return maxLength;
13         }
14         if (str.charAt(position) == str.charAt(position - 1)) {
15             count++;
16             if (count > maxLength) {
17                 maxLength = count;
18             }
19         } else {
20             count = 1;
21         }
22         return maxLength(str, position + 1, count, maxLength);
23     }
24 
25     public static void main(String[] args) {
26         // input : "abdsdxxxhbbbbbasdaaf"
27         String str = "abdsdxxxhbbbbbasdaaf"; // "bbbbb"----5
28         // String str = "a"; expected output: 1
29         // String str = ""; expected output: 0
30         // String str = null; expected output: 0
31         if (str == null || str.isEmpty()) {
32             System.out.println(0);
33         } else if (str.length() == 1) {
34             System.out.println(1);
35         } else {
36             System.out.println(maxLength(str, 1, 1, 1));
37         }
38 
39     }
40 
41 }