Thread: Getting the width and height of a frame without borders

So im using the this.getContentPane().getSize(); to set a Dimension variable called borderlessSize (because its supposed to contain the size of the frame excluding the borders) and then im setting an int borderlessWidth and an int borderlessHeight, to borderlessSize.getWidth/Height. However when i print out borderlessWidth, and borderlessHeight, theyre both showing up as 0?? please help!! Heres my code.

---

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
 
import javax.swing.JFrame;
 
 
public class Frame extends JFrame
{
	int xCoord = 50; 
	int yCoord = 50;
	private final int ovalWidth = 25;
	private final int ovalHeight = 25;
	private final int WIDTH = 800;
	private final int HEIGHT = WIDTH / 5 * 4;
	private Dimension borderlessSize = this.getContentPane().getSize();
	private final int borderlessWidth = (int)borderlessSize.getWidth();
	private final int borderlessHeight = (int)borderlessSize.getHeight();
	private Image dbImage;
	private Graphics dbG;
	private Dimension d = new Dimension(WIDTH, HEIGHT);
 
	Frame()
	{
		addKeyListener(new AL());
		setTitle("Frame");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(d);
		setResizable(false);
		setVisible(true);
		setBackground(Color.WHITE);
 
		System.out.println(borderlessWidth + " " + borderlessHeight);
	}
 
	public void paint(Graphics g)
	{
		dbImage = createImage(getWidth(), getHeight());
		dbG = dbImage.getGraphics();
		paintComponent(dbG);
		g.drawImage(dbImage, 0, 0, this);
 
	}
 
	public void paintComponent(Graphics g)
	{
		g.fillOval(xCoord, yCoord, ovalWidth, ovalHeight);
 
		repaint();
	}
 
	public class AL extends KeyAdapter
	{
		public void keyPressed(KeyEvent e)
		{
			int keyCode = e.getKeyCode();
 
			if(keyCode == e.VK_LEFT)
			{
				if(xCoord <= 0)
				{
					xCoord = 0;
				}
				else
				{
					xCoord += -15;
				}
			}
			if(keyCode == e.VK_RIGHT)
			{
				if(xCoord >= borderlessWidth - ovalHeight)
				{
					xCoord = borderlessWidth - ovalHeight;
				}
				else
				{
					xCoord += 15;
				}
			}
			if(keyCode == e.VK_UP)
			{
				if(yCoord <= 0)
				{
					System.out.println("top collision");
					yCoord = 0;
				}
				else
				{
					yCoord += -15;
				}
			}
			if(keyCode == e.VK_DOWN)
			{
				if(yCoord >= borderlessHeight - ovalHeight)
				{
					yCoord = borderlessHeight - ovalHeight;
				}
				else
				{
					yCoord += 15;
				}
			}
		}
	}
}

I am declaring the borderlessDimension before I declare the frame and set it Visible, let me try declaring it after

--- Update ---

Dude thanks so much! I feal like an idiot now haha