Java Swing Test Frame

This post has nothing to do with poker.

I often need to test a specific aspect of Java’s Swing GUI toolkit to reproduce a problem. In order to help me and others avoid having to rewrite boiler-plate code to make the smallest possible reproduction case, I’m posting the basic code I use here. Consider it an easily-found memo to myself:

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

public class SwingTestFrame {

    public static void main(String[] args) {
        createAndLaunchGui();
    }

    private static void createAndLaunchGui() {
        // UIManager.setLookAndFeel throws "nothing we can do about it" style exceptions. Best thing to do is
        // to wrap as an unchecked exception
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        // using invoke later avoids possible obscure phantom timing issues
        // as (almost) all GUI code should be run on the Event Dispatch Thread
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                final JFrame frame = new JFrame("Java Swing Test Frame");

                // when the close window control is clicked, we want the app to exit
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                // using a panel as a top level component to hold all other GUI controls is a flexible approach
                final JPanel panel = new JPanel();
                addComponentsToPanel(panel);
                frame.getContentPane().add(panel);

                frame.setPreferredSize(new Dimension(600, 400));
                // pack layouts the frame according to the current LayoutManager
                frame.pack();
                // setLocationRelativeTo(null) centres the frame
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    // modify this to build your GUI
    private static void addComponentsToPanel(JPanel panel) {
        panel.add(new JLabel("Hello cruel world"));
        panel.add(new JButton("Do Stuff"));
    }


}

Once more without most comments:

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

public class SwingTestFrame {

    public static void main(String[] args) {
        createAndLaunchGui();
    }

    private static void createAndLaunchGui() {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                final JFrame frame = new JFrame("Java Swing Test Frame");

                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                final JPanel panel = new JPanel();
                addComponentsToPanel(panel);
                frame.getContentPane().add(panel);

                frame.setPreferredSize(new Dimension(600, 400));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    // modify this to build your GUI
    private static void addComponentsToPanel(JPanel panel) {
        panel.add(new JLabel("Hello cruel world"));
        panel.add(new JButton("Do Stuff"));
    }


}