write a program in Java to find the frequency of character or occurrence of each character in given string.

import java.util.*;   class FrequencyOfCharacters   {           public static void main(String[] args)           {                    System.out.println("Enter the string");                    String s=new Scanner(System.in).nextLine();                    frequency(s);           }           public static  void frequency(String str)           {                    Character c;                    HashMap hm=new HashMap();                    for(int i=0;i<str.length();i++)                    {                              c=str.charAt(i);                              if(hm.containsKey(c))                                       hm.put(c,hm.get(c)+1);                              else                                       hm.put(c,1);                    }                    Set keySet = hm.keySet();                    Iterator keySetIterator = keySet.iterator();                    while (keySetIterator.hasNext()) {                    Character key = keySetIterator.next();                    System.out.println(key + " " + hm.get(key));           }   }  }

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