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Hardwired sorry to bother you but I was able to get the JFrame to size itself based on the number of grid squares. I also have each square as being 100x100. However at the bottom and right side of the grid I get lines that just keep going. I get the correct number of squares in each direction but than the extra lines appear. Below is the code I have but I cannot seem to pinpoint where the issue lies.

Code:

import java.awt.*;
import java.awt.geom.Line2D;
import javax.swing.*;

public class CreateGridRx extends JPanel {
    int gridSize;
    final int PAD = 10;
    
    public CreateGridRx(int size) {
        this.gridSize = size;
    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
       int w = getWidth();
       int h = getHeight();
       //double xInc = (double)(w - 2*PAD)/gridSize;
       //double yInc = (double)(h - 2*PAD)/gridSize;
        double xInc = 100;
        double yInc = 100;
        for(int j = 0; j <= gridSize; j++) {
            double x = PAD + j*xInc;
            g2.draw(new Line2D.Double(x, PAD, x, h-PAD));
        }
        for(int j = 0; j <= gridSize; j++) {
            double y = PAD + j*yInc;
            g2.draw(new Line2D.Double(PAD, y, w-PAD, y));
       }
    }
}

Code:

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import java.awt.*;


public class CreateGrid {
    
       /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        
              
       // Prompts user for size of grid.  For example if user inputs a 4 a 4x4 
       // grid of squares is created.
        String input = JOptionPane.showInputDialog(
                "Enter number of rows and columns you want grid to contain\n" +
                "(For example entering 2 will create a 2x2 grid)\n");
        
         // Takes input and parses it from a string type to an integer type that
        // can be used to generate the grid squares
          int gridSquares = Integer.parseInt( input ); 
     
          
       // Creates frame that holds the grid which is prouced by the CreateGridRx
       // class
        CreateGridRx test = new CreateGridRx(gridSquares);
        int PAD = 10;
        int calculatedWidth = ( 100 + 2*(PAD) )*gridSquares;
        int calculatedHeight = ( 100 + 2*(PAD) )*gridSquares;
        test.setPreferredSize(new Dimension(calculatedWidth, calculatedHeight));
        JFrame f = new JFrame(); // creates new JFrame object
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(test);
        f.pack(); // sets size of frame
        f.setLocation(200,200); // sets location of frame
        f.setVisible(true); // 
             }
        }