how to find the frequency of characters in given string in java

import java.util.*;import java.lang.*;class Demo{    public static void main(String[] args){        String name = "idiot";        Map<Character,Integer> map = new HashMap<Character,Integer>();        for(int i=0;i<name.length();i++){            Character ch = name.charAt(i);            map.put(ch,map.getOrDefault(ch,0)+1);        }        System.out.println(map);        for(Map.Entry<Character,Integer> e : map.entrySet()){            System.out.println(e.getKey()+" "+e.getValue());        }    }   }