Outputting each letter in a string twice

Question

hello, im very new to java.
how would i go about writing a program which takes the user's input as a string, then out puts it the string twice.
For example, if the user inputs : twice
it would outout : ttwwiiccee
i know of i would have to use while loop untill the string ends, but i dont know how to to make it so the string outputs twice >_<
thanks =)

Answer 1

import java.util.Scanner;
public class Homework4
public static void main(String[] args)
          Scanner keyboard= new Scanner(System.in);
          String input;
          int i = 0;
          System.out.println("enter a string");
          input = keyboard.nextLine();
          while (i < input.length())
          System.out.print((input.charAt(i))+"" +(input.charAt(i)));
          i++;
ii tthhiinnkk**