Count each character and sort the string

Here we have shown how to count the character occurrence in the string and print in sorted way




For example, you have a string :
input : bbcann
and your output would be 1b2c1n2 , means you have counted and also printed in sorted way from a to z.
This is commonly asked questions on online test.

public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
        System.out.print(countChracter("bbcann"));
    }
    
    
   static String countChracter(String s){
    char[] carray=s.toCharArray();
    Arrays.sort(carray);
    HashMap<Character,Integer> hm = new HashMap<Character, Integer>();
    for(char c : carray){
    if(hm.containsKey(c)){
    hm.put(c, hm.get(c)+1);
    }else{
    hm.put(c, 1);
    }
   
    }
    String output="";
    for(Map.Entry e: hm.entrySet()){
    output=output+e.getKey()+e.getValue();
    }
    return output;
    }
    
}