Challenge 20 I/O

//Hector Villalobos
//PROGRAMMING I M-F 11am

import java.util.Scanner;
import java.io.*;

public class Challenge20SquareDisplayOutput {
  public static void main(String[] args) throws IOException {

    Scanner keyboard = new Scanner(System.in);

    PrintWriter outputFile = new PrintWriter("SquareDisplay.txt");

    System.out.print("Enter a positive integer no greater than 15: ");
    int input = keyboard.nextInt();

    while(input > 15) {
      System.out.print("Invalid integer. Try Again: ");
      input = keyboard.nextInt();
    }

    for(int i = 1; i <= input; i++) {
      for(int j = 1; j <= input; j++)
        outputFile.print("X");
      outputFile.println();
    }
    outputFile.close();
    System.out.println("Data written to the file.");
  }
}