input and specify the character to print out and the number of characters to print on each line

Question

I am trying to allow the user to specify the character to print out and the number of characters to print on each line.

I tried to reach this goal with the following class and method:

import java.util.Scanner; public class test3char { /** * @param args */ public static void main(String[] args) { //insert the character System.out.println("insert character"); Scanner keyboard = new Scanner(System.in); String str= keyboard.nextLine(); //insert the time you would like to print the character System.out.println("insert the number of times you would like to print the car"); int n = keyboard.nextInt(); keyboard.close(); // loop int i; for (i=1;i<=n;i=i+1) { System.out.print(str.charAt(i)); } } }

I have the following error at line 17:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 1 at java.lang.String.charAt(Unknown Source) at test3char.main(test3char.java:17)

How I can fix this loop in order to print the string input by the user by n time on the same line.

Not sure I'm following. Can you share a sample input and the output that's supposed to be generated for it? — Mureinik
– Mureinik, Commented Oct 8, 2017 at 8:00
Why are you printing str.charAt(i)? Do you know what that means? — Kevin Anderson
– Kevin Anderson, Commented Oct 8, 2017 at 8:09

Sash Sinha · Accepted Answer · 2017-10-08 08:19:12Z

You are on the right track, but instead of using charAt inside your for-loop, instead try something like this where you use charAt earlier on:

import java.util.Scanner; class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Please enter the character you want repeated: "); char character = scanner.next().charAt(0); System.out.print("Please enter the number of times you would like to print the character:"); int number = scanner.nextInt(); for(int i = 0; i < number; i++) { System.out.print(character); } } }

Example usage:

Please enter the character you want repeated: a Please enter the number of times you would like to print the character: 5 aaaaa

Joe C · Accepted Answer · 2017-10-08 08:04:52Z

From the Javadoc:

Returns the char value at the specified index. An index ranges from 0 to length() - 1. The first char value of the sequence is at index 0, the next at index 1, and so on, as for array indexing.

You're going from 1 to length(), not 0 to length() - 1.

@JohnS. Don't forget to upvote and accept this answer (using the tick underneath the voting buttons) if you found it useful.

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