java中對字串每個字元統計的方法_java

複製代碼 代碼如下:

/*
    String name = "adsbsadgsadgtewterfsdf";
    eg a-->6,b-->1 d-->3 ...
    將字串以a(字母)=>2(個數)存入Map集合架構中
   思路:1.將字串轉換成字元數組.
          2.定義一個Map集合,然後對字元數組進行遍曆,如果Map集合中沒有該元素就將該元素存入Map集合中,並定義一個計數器,將次數存入Map中,來達到目的 

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

            TreeMap<Character,Integer> tm = new TreeMap<Character,Integer>();

            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;
    }
}