Count Duplicate Character

package com.tutorial4u;

import java.util.HashSet;

import java.util.Scanner;

public class DuplicateCharCount {

     public static void main(String[] args) {

           int count = 0;

           System.out.print("Enter any String : ");

           Scanner sc = new Scanner(System.in);

           String str = sc.nextLine();

           char[] ch = str.toCharArray();

           System.out.print("Duplicate character are : ");

           for(int i = 0;i<ch.length;i++){

                for(int j = i+1;j<ch.length;j++){

                      if((ch[i] == ch[j]) && (i!=j)){

                           System.out.print(ch[i]);

                           count++;

                           break;

                      }

                }

           }

     }

}

Output : 

Enter any String : tutorial4u

Duplicate character are : tu