JFrame setting inner size?

Question

Hello,
I've a simple program which opens a JFrame with a JPanel inside it.
I've set the layout to null and manually placed the JPanel with 0,0,600,400 as the bounds.
The JFrame size is set to 600,500
The problem: The JFrame has the correct size, but I want the size of the inside of the JFrame to be 600*500 instead of everything like title bar included, what's the best way to automatically do this?
My sample program:
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Problem {
    public static void main(String[] args) {
        aGUI gui = new aGUI();
        gui.setDefaultCloseOperation(3);
        gui.setSize(600, 500);
        gui.setVisible(true);
class aGUI extends JFrame {
    public aGUI() {
        super("My example...");
        setLayout(null);
        JPanel p = new JPanel();
        p.setBounds(0, 0, 600, 400);
        p.setBackground(Color.red);
        add(p);
}When you run it, and make the frame bigger, you'll notice that some of the red is hidden behind the frame...

Answer 1

The_Pointer wrote:
The problem: The JFrame has the correct size, but I want the size of the inside of the JFrame to be 600*500 instead of everything like title bar included, what's the best way to automatically do this?What is the exact problem I doubt. But in my habit, if you specify the size of the panel inside JFrame, how do you expect that'll be resized as the frame get maximized!!!