map输出指定键的值只想输出a的个数该怎么改啊？

Question

import java.util.Map;
import java.util.TreeMap;

public class Main3 {
    public static void main(String[] args){
       String b= "agscoefmcpasewajcapofkakekfmvakmdk";
        char[] m=b.toCharArray();
        Map<Character,Integer> map=new TreeMap<>();
        for (char charm:m){
          Boolean bool=map.containsKey(charm);
          if (bool){
              Integer count=map.get(charm);
              count++;
              map.put(charm,count);
          }
          else {
              map.put(charm,1);
          }
        }
        System.out.println(map);
    }
}

```

Answer 1

map.get('a');