Java method to count each character in a string

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; 
    } 
}