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To finish the program I have to draw the lines using the following rules:

-Whatever number the user entered, that’s how many horizontal and vertical lines should be in the grid.
-The lines should...

That was my problem, thank you. But now I have another question, I need to have an input trap error so that the user can only enter numbers from 10 to 40. How would I do that, would I use an "if"...

import java.awt.Color;
import javax.swing.JFrame;
import java.awt.Graphics;
import javax.swing.JOptionPane;

public class Program2 extends JFrame {

private static final int FRAME_SIZE =...