给你一个任意字符串，你去打印出它所有字符出现的次数？？

 1 package kimi;
 2 
 3 import java.util.LinkedHashMap;
 4 import java.util.Map;
 5 import java.util.Set;
 6 
 7 public class Text$$$$ {
 8     public static Map<String, Integer> map = new LinkedHashMap<>();
 9 
10     public static Map<String, Integer> getLetterCountByString(String string) {
11         int length = string.length();
12         String first = string.substring(0, 1);
13         string = string.replace(first, "");
14         map.put(first, length - string.length());
15         return string.length() > 0 ? getLetterCountByString(string) : map;
16     }
17 
18     public static void main(String[] args) {
19         Map<String, Integer> map = getLetterCountByString("sdsdas s2334@@ 我睡觉哦 sda3 ");
20         Set<String> set = map.keySet();
21         for (String key : set) {
22             System.out.println("key:" + key + "     value:" + map.get(key));
23         }
24     }
25 }

key:s     value:5
key:d     value:3
key:a     value:2
key:      value:4
key:2     value:1
key:3     value:3
key:4     value:1
key:@     value:2
key:我     value:1
key:睡     value:1
key:觉     value:1
key:哦     value:1