How to turn off visibility of X button and disable alt + F4 function

Question

Can someone tell me how to set my X button in main application window visible to false and how to set Alt + F4 function not available or just disable it?

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Update

Answer 1

For setting X button to invisible is very much described by @trashgod and For disabling your ALT + F4 thing, you can simply write frameObject.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

or you can addWindowListener(...) to your JFrame like this :

Code snippet to show what i am saying :

import java.awt.event.*;
import javax.swing.*;

public class FrameTest
{
    private WindowAdapter windowAction;
    private JFrame frame;

    public FrameTest()
    {
        frame = new JFrame("FRAME TEST");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationByPlatform(true);

        windowAction = new WindowAdapter()
        {
            public void windowClosing(WindowEvent we)
            {
                frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
            }
        };

        frame.addWindowListener(windowAction);

        frame.setSize(100, 100);
        frame.setVisible(true);     
    }
    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new FrameTest();
            }
        });
    }
}

Answer 2

"A frame may have its native decorations (i.e. Frame and Titlebar) turned off with setUndecorated."—Frame

Addendum: You can send a WINDOW_CLOSING event and bind that Action to your desired Keystroke, as shown here.