Coding Interview : How to find duplicate characters from String in Java also print the frequency?

The problem statement say that we need to identify how many time a character appear in a string.

Program : 
package net.jubiliation.example;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

public class CharacterFrequencyExample {
 public static void main(String[] args) {

  String str = "yweeeeerwwesfsfsfsgsgdgxcbgd";

  // convert this String into array of character
  char[] characterArray = str.toCharArray();
  final Map<Character, Integer> charactersMap = new HashMap<>();

  // maintain for each loop to traverse through each element
  for (Character character : characterArray) {
   if (charactersMap.containsKey(character)) {
    int count = charactersMap.get(character);
    count++;
    charactersMap.put(character, count);
   } else {
    charactersMap.put(character, 0);
   }
  }

  // Iterating the map to print the characters and frequency
  for (Entry<Character, Integer> characterEntry : charactersMap.entrySet()) {
   Character character = characterEntry.getKey();
   if (charactersMap.containsKey(character)) {
    int count = charactersMap.get(character);
    count++;
    charactersMap.put(character, count);
    if (count > 1) {
     System.out.println("Duplicate Character: " + character);
    }
    System.out.println("Character: " + character + " | Frequency: " + count);
   }
  }
 }
}


Result :
Character: r | Frequency: 1
Duplicate Character: s
Character: s | Frequency: 4
Duplicate Character: e
Character: e | Frequency: 6
Duplicate Character: f
Character: f | Frequency: 3
Duplicate Character: w
Character: w | Frequency: 3
Character: y | Frequency: 1