How to Maximize and Minimize Jframe Window

In this tutorial, we will learn how to maximize and minimize JFrame window. We will also see how to do this with button clicks.

To maximize a JFrame window, you can use the setExtendedState method and pass in the JFrame.MAXIMIZED_BOTH constant as the argument.

Maximize Jframe

For example:

JFrame frame = new JFrame();

// maximize the frame
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);

// show the frame
frame.setVisible(true);

You can also use the setUndecorated method and pass in true as the argument to remove the frame’s border and title bar, and then use the setBounds method to set the frame’s size to the size of the screen. For example:

JFrame frame = new JFrame();

// remove the frame's border and title bar
frame.setUndecorated(true);

// get the screen dimensions
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

// set the frame's size to the screen size
frame.setBounds(0, 0, screenSize.width, screenSize.height);

// show the frame
frame.setVisible(true);

Minimize JFrame Window

To minimize a JFrame window, you can use the setExtendedState method and pass in the JFrame.ICONIFIED constant as the argument. For example:

JFrame frame = new JFrame();

// minimize the frame
frame.setExtendedState(JFrame.ICONIFIED);

Note that this will minimize the frame, but it will not hide it. To hide the frame completely, you can use the setVisible method and pass in false as the argument. For example:

JFrame frame = new JFrame();

// minimize and hide the frame
frame.setExtendedState(JFrame.ICONIFIED);
frame.setVisible(false);

Alternatively, you can use the setState method and pass in the Frame.ICONIFIED constant as the argument to minimize the frame. For example:

JFrame frame = new JFrame();

// minimize the frame
frame.setState(Frame.ICONIFIED);

Maximize and Minimize JFrame Window with button click:

To maximize and minimize a JFrame window with a button click, you can create a JButton and add an action listener to it that toggles the frame’s extended state between JFrame.MAXIMIZED_BOTH and JFrame.NORMAL. For example:

JFrame frame = new JFrame();
JButton button = new JButton("Toggle Maximize");

button.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        if (frame.getExtendedState() == JFrame.MAXIMIZED_BOTH) {
            frame.setExtendedState(JFrame.NORMAL);
        } else {
            frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
        }
    }
});

frame.add(button, BorderLayout.NORTH);
frame.setVisible(true);

In order to minimize and restore the frame with a button click, you can use the same approach, but toggle the extended state between JFrame.ICONIFIED and JFrame.NORMAL. For example:

JFrame frame = new JFrame();
JButton button = new JButton("Toggle Minimize");

button.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        if (frame.getExtendedState() == JFrame.ICONIFIED) {
            frame.setExtendedState(JFrame.NORMAL);
        } else {
            frame.setExtendedState(JFrame.ICONIFIED);
        }
    }
});

frame.add(button, BorderLayout.NORTH);
frame.setVisible(true);

Hide the JFrame window completely

Note that this will minimize the frame, but it will not hide it. To hide the frame completely, you can use the setVisible method and pass in false as the argument in the action listener. For example:

JFrame frame = new JFrame();
JButton button = new JButton("Toggle Minimize");

button.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        if (frame.isVisible()) {
            frame.setExtendedState(JFrame.ICONIFIED);
            frame.setVisible(false);
        } else {
            frame.setExtendedState(JFrame.NORMAL);
            frame.setVisible(true);
        }
    }
});

frame.add(button, BorderLayout.NORTH);
frame.setVisible(true);