duplicate_char.java

import java.util.*;
public class Ankdos{


    static int count(char letter , String word ){
        
        int i = 0,counts = 0 ;
        while(i<word.length()){
            if (letter == word.charAt(i) ){
                counts++;
            }
            i++;
        }
        
        return counts;
    }
    
    
    static String reps(String word){
         
         int i = 0 ,k=0;
         String reps = "";
         List<String> mark = new ArrayList<String>();  //to mark the repeated character 
         while(i < word.length()){
             if(count(word.charAt(i),word) > 1 && mark.contains(Character.toString(word.charAt(i))) == false ){
                 reps += Character.toString(word.charAt(i));
                 mark.add(Character.toString(word.charAt(i))); 
                 reps +=" ";
                 k++;
             }
            i++;   
         }
        
          return reps;
    }

     public static void main(String []args){
      
      String word = "ankuarawquijvkjsdvr";
      System.out.println(reps(word));
      
     }
}