nested for loops statements

Question

Use nested for loops statements to draw empty boxes of any character (user input). The boxes have the same number of rows and columns (user input - valid range: 5 to 21). Test for errors in input (including type).

Answer 1

/*

I am coding this in Java and using the java.util.Scanner class (use import keyword in an actual file).

You could also use args[0] and args[1] for the 2 inputs, but that usually is only for console applications.

*/

public static void main(String[] args) {

Scanner s = new Scanner(System.in);

System.out.println("Enter width of each side of box: ");

try {

int width = s.nextInt();

if (width < 5 || width > 21) {

throw new IllegalArgumentException("Invalid width!");

}

System.out.println("Enter character that boxes are made of: ");

String inputString = s.next();

if (s.length() != 1) {

throw new IllegalArgumentException("Invalid character!");

}

draw(s.charAt(0), width);

} catch (Exception e) {

System.out.println("Invalid input!");

}

s.close();

}

public void draw(char c, int width) {

for (int y = 0; y < width; y++) {

for (int x = 0; x < width; x++) {

if (x == 0 || y == 0 || x == width - 1 || y == width - 1) { //conditions for edges of box

System.out.print(c);

}

else {

System.out.print(" "); //print blank space if not on an edge

}

} //x for loop

System.out.println(); //go to next line (next y value)

} //y for loop

}