How do I change JFrame state programmatically?

In the following code snippet you’ll learn how to programmatically change the frame state of a JFrame component in a Swing application. The JFrame states are represented as a bitwise masks. You can minimize, maximize or make the JFrame state to normal using the JFrame.setExtendedState() method.

You can pass the following values as the parameter to the method:

  • Frame.NORMAL
  • Frame.ICONIFIED
  • Frame.MAXIMIZED_HORIZ
  • Frame.MAXIMIZED_VERT
  • Frame.MAXIMIZED_BOTH
package org.kodejava.example.swing;

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

public class SwingFrameState extends JFrame {
    public SwingFrameState() throws HeadlessException {
        initUI();
    }

    private void initUI() {
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        final JButton minimize = new JButton("Minimize");
        final JButton maximize = new JButton("Maximize");
        final JButton normal = new JButton("Normal");

        add(normal);
        add(minimize);
        add(maximize);

        pack();
        setSize(200, 200);

        ActionListener listener = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if (e.getSource() == normal) {
                    setExtendedState(Frame.NORMAL);                    
                } else if (e.getSource() == minimize) {
                    setExtendedState(Frame.ICONIFIED);
                } else if (e.getSource() == maximize) {
                    setExtendedState(Frame.MAXIMIZED_BOTH);
                }
            }
        };

        minimize.addActionListener(listener);
        maximize.addActionListener(listener);
        normal.addActionListener(listener);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new SwingFrameState().setVisible(true);
            }
        });
    }
}
Wayan Saryada

Wayan Saryada

A programmer, runner, recreational diver, currently living in the island of Bali, Indonesia. Mostly programming in Java, creating web based application with Spring Framework, JPA, etc. If you need help on Java programming you can hire me on Fiverr.
Wayan Saryada

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