Maximising a frame to fullscreen on start-up?

[Tim frank]

Hey, I've got a frame the is intended to be at fullscreen size - so who ever uses this program the frame is intended to maximise to meet the size of their screen. However I can't figure out how this is done?

Can anyone shed some light on the matter?

Regards

[Jonathan Janisch]

public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setExtendedState(JFrame.MAXIMIZED_BOTH);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
}

The Java Forum is a good place to search for stuff like this.

[Michael Dunn]

you'll need to experiment with this

    
import javax.swing.*;
import java.awt.*;
class Testing
{
  public void buildGUI()
  {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
    f.setExtendedState(JFrame.MAXIMIZED_BOTH);
    //GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
    //f.setMaximizedBounds(env.getMaximumWindowBounds());
    //f.setVisible(true);
  }
  public static void main(String[] args)
  {
    SwingUtilities.invokeLater(new Runnable(){
      public void run(){
        new Testing().buildGUI();
      }
    });
  }
}

the pc I'm on now (1.4.0_01, win98se) MAXIMIZED doesn't work if set before
the frame is made visible. my home pc, 1.5.0_05, it works the other way around.

if MAXIMIZED covers your taskbar, and you don't want it to, include the
GraphicsEnvironment bit.

[Tim frank]

I'm using JBuilder Frame designer tool to make this program and in the code it doesnt give have a JFrame construcotr.. anywhere, So i cant change the size that way. I

n the design view the only top level components I can see are the contentPane, Jscrollpane, and Jtoolbar.

Ahh please help, this is frustrating beyond belief.

[Michael Dunn]

One of the joys of using a gui-builder.

Perhaps worth posting in one of Borland's JBuilder forums.

[Jonathan Janisch]

Timbo, I just downloaded JBuilder just to answer your question

I have never used it before. It is JBuilder 2005 Foundation.

1) I created a new project.
2) I created a new "Frame" called "MyFrame" using the javax.swing.JFrame base class.
3) I clicked the "Design" tab.
4) I added a JLabel and JButton.

It generated the following code:

import java.awt.BorderLayout;
 
import javax.swing.JFrame;
import javax.swing.JTextField;
import java.awt.*;
import javax.swing.JButton;
 
public class MyFrame extends JFrame {
    BorderLayout borderLayout1 = new BorderLayout();
    JTextField jTextField1 = new JTextField();
    JButton jButton1 = new JButton();
 
    public MyFrame() {
        try {
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
 
    private void jbInit() throws Exception {
        getContentPane().setLayout(borderLayout1);
        jTextField1.setText("jTextField1");
        jButton1.setText("jButton1");
        this.getContentPane().add(jTextField1, java.awt.BorderLayout.CENTER);
        this.getContentPane().add(jButton1, java.awt.BorderLayout.NORTH);
    }
 
    public static void main(String[] args) {
        MyFrame myframe = new MyFrame();
    }
}

Notice: MyFrame extends JFrame. Thus, when MyFrame()'s constructor is called, JFrame's default constructor is automatically called.

I added the following code to maximize the window as in my first post and it worked as expected:

public static void main(String[] args) {
        MyFrame myframe = new MyFrame();
        myframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // added
        myframe.setExtendedState(JFrame.MAXIMIZED_BOTH); // added
        myframe.setVisible(true); // added
}

You will probably have to combine this with Michael's code to get it to work for earlier JDK's.
[ March 20, 2007: Message edited by: Jonathan Janisch ]

[Jonathan Janisch]

If you're going to do GUI development, I strongly suggest NetBeans. It's much more straightfoward to design a GUI out of the box using NetBeans than other Java IDE's.

[Tim frank]

Sorry, I'm an idiot. I was looking for the frame decloration in the wrong class... it's working fine now haha. Thanks everyone

[Nathan Pruett]

"Timbo/Cicatraz" -

Welcome to the JavaRanch! We don't have many rules around the ranch, but we do have a policy on displayed names... Please adjust your displayed name to meet the JavaRanch Naming Policy. User names cannot be obviously fake and must consist of a first name and a last name.

You can change your user name here.

Thanks! and welcome to the JavaRanch!
[ March 21, 2007: Message edited by: Nathan Pruett ]