Java-Programs/String/DuplicateCharsInString.java at master · Gawsan/Java-Programs · GitHub

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package String;

Write a program to find out duplicate or repeated characters in a string,

and calculate the count of repeatation.

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

public class DuplicateCharsInString {

public void findDuplicateChars(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){

if(dupMap.get(ch) > 1){

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

}

public static void main(String a[]){

DuplicateCharsInString dcs = new DuplicateCharsInString();

dcs.findDuplicateChars("Java2Novice");

}

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