Program to Remove Duplicate Characters from a Word

13 December 2014

Java program to input a word and remove the duplicate characters present in it.

Question:

Write a program to input a word from the user and remove the duplicate characters present in it.

Example:

INPUT - abcabcabc OUTPUT - abc

INPUT - javaforschool OUTPUT - javforschl

INPUT - Mississippi OUTPUT - Misp

Programming Code:

Java

/**
 * The class RemoveDupChar inputs a word and removes duplicate characters
 * @author : www.guideforschool.com
 * @Program Type : BlueJ Program - Java
 */

import java.util.Scanner;
class RemoveDupChar
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter any word : ");
        String s = sc.nextLine();
        int l = s.length();
        char ch;
        String ans="";
        
        for(int i=0; i<l; i++)
        {
            ch = s.charAt(i);
            if(ch!=' ')
                ans = ans + ch;
            s = s.replace(ch,' '); //Replacing all occurrence of the current character by a space
        }

       System.out.println("Word after removing duplicate characters : " + ans);
    }
}

Output:

Example 1: Enter any word : Mississippi Word after removing duplicate characters : Misp

Example 2: Enter any word : Attitude Word after removing duplicate characters : Atiude