Write a Program to Find Duplicate Character Counts In Java?

Write a Program to Find Duplicate Character Counts In Java?

package com.java.Softwaretestingblog;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;
public class DuplicateCharCountUsingCollection
{
   public void DuplicateCharactersCount(String str) {
      Map<Character, Integer> dupMap = new HashMap<Character, Integer>();
      char[] chrs = str.toCharArray();
      for(Character ch:chrs){
         if(dupMap.containsKey(ch)){
            dupMap.put(ch, dupMap.get(ch)+1);
         } else {
            dupMap.put(ch, 1);
         }
      }
      Set<Character> keys = dupMap.keySet();
      for(Character ch:keys){

         System.out.println(ch+"---&gt;"+dupMap.get(ch));

      }
   }

   public static void main(String[] args) throws IOException {
      // TODO Auto-generated method stub
      String s;
      DuplicateCharCountUsingCollection obj = new DuplicateCharCountUsingCollection();
      @SuppressWarnings("resource")
      BufferedReader keyboardInput;
      keyboardInput = new BufferedReader(new InputStreamReader(System.in));
      System.out.println(" please enter your flavour ice cream");
      String str  =  keyboardInput.readLine();
      obj.DuplicateCharactersCount(str);

   }
}

Read Also: Find Duplicate Character In A Input String

Reference: Article