Question

4.29 (Square of Asterisks) Write an application that prompts the user to enter the size of the side of a square, then displays a hollow square of that size made of asterisks. Your program should work for squares of all side lengths between 1 and 20.

I keep getting the error: "AsteriskSquare.java:2: error: class Main is public, should be declared in a file named Main.java public class Main ^ 1 error"

Answer 1

import java.util.Scanner;

public class PrintSquare{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int sides = 0;

      while(sides == 0 || sides > 20){
      System.out.println("Enter a number between 1 and 20: ");
      int input = sc.nextInt();

       if(input > 0 && input <= 20)
         sides = input;
        }

        for(int i=0; i<sides; i++){
            
         if(i == 0 || i == sides-1){
          for(int j=0; j<sides; j++){
           System.out.print("*");
           }
            }else{
         System.out.print("*");
              
           for(int j=0; j<sides-2; j++){
           System.out.print(" ");
             }
              System.out.print("*");
            }
            System.out.println();
        }
    }
}