java中对字符串每个字符统计的方法

复制代码 代码如下:

import java.util.*;
class CharMapDemo
{
    public static void main(String[] args)
    {
        String str = "abcedsadgsadfasdfaa";
        TreeMap tm = Pross(str);
        System.out.println(tm);
    }
    public static TreeMap Pross(String str)
    {
            char[] charArray = str.toCharArray();

            TreeMap tm = new TreeMap();

            for (int x = 0; x < charArray.length ;x++ )
            {
                if(!tm.containsKey(charArray[x]))
                {
                    tm.put(charArray[x],1);
                }
                else
                {
                    int count = tm.get(charArray[x])+1;
                    tm.put(charArray[x],count);
                }
            }
            return tm;
    }
}