Question

I have been trying to get the window to automatically maximize using Netbeans.

I’ve probably looked through 4 or 5 pages of Google for an answer.

The web pages always provide something like this:

public void run() {
    MyFrame myFrame = new MyFrame();
    myFrame.setVisible(true);
    myFrame.setExtendedState(myFrame.getExtendedState() | JFrame.MAXIMIZED_BOTH);
}

I am using Netbeans 6.9.1

Does this no longer work? Is there another way to do this?

Also, if you find your answer on a web page, please provide the link so I can look into this further. Thanks in advance for any input! 🙂

Answer 1

Regarding setExtendedState(), “Note that if the state is not supported on a given platform, nothing will happen.”

If that’s not relevant, an sscce may be helpful.

Addendum: This example seems to function correctly:

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;

/** @see http://stackoverflow.com/questions/5207425 */
public class NewJavaGUI extends JPanel {

    private void display() {
        JFrame f = new JFrame("NewJavaGUI");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(this);
        f.pack();
        f.setExtendedState(f.getExtendedState() | JFrame.MAXIMIZED_BOTH);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new NewJavaGUI().display();
            }
        });
    }
}

Addendum: The relevant state constants appear to form a coherent set. In particular, MAXIMIZED_HORIZ | MAXIMIZED_VERT == MAXIMIZED_BOTH:

NORMAL          0 0000
MAXIMIZED_HORIZ 2 0010
MAXIMIZED_VERT  4 0100
MAXIMIZED_BOTH  6 0110