如何创建一个包含参数的JList？

Question

Hi i'm trying to make a JList but it takes 2 Parameters. The list is a list of servers.

public class MainMenu extends JPanel {

    Kingdomcraft kd;
    Screen screen;
    JButton playSP;
    JButton playMP;
    JButton settings;
    JButton quit;
    JButton createWorld;
    JButton addServer;
    JSlider sound;
    JSlider light;
    @SuppressWarnings("rawtypes")
    JList worldList;
    JList serverList;

    private Preferences prefs;
    private int soundLevel;
    private int lightLevel;

    public void run() {

        kd = new Kingdomcraft();
        screen = new Screen();
        playSP = new JButton("Singleplayer");
        playMP = new JButton("Multiplayer");
        settings = new JButton("Settings");
        quit = new JButton("Quit");
        createWorld = new JButton("Create World");
        addServer = new JButton("Add Server");
        sound = new JSlider();
        light = new JSlider();
        prefs  = Preferences.userNodeForPackage(MainMenu.class);
        soundLevel = prefs.getInt("SOUND_LEVEL", 50);
        lightLevel = prefs.getInt("LIGHT_LEVEL", 50);
        worldList = new JList();
        serverList = new JList();

        this.setBackground(Color.BLACK);
        this.setLayout(null);

        if (kd.inMainMenu) {

            add(createWorld);

            createWorld.setBounds(170, 10, 150, 35);

            add(playSP);

            playSP.setBounds(10, 10, 150, 35);

            playSP.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent e) {

                    remove(sound);
                    remove(light);
                    remove(addServer);
                    repaint();
                    add(createWorld);

                    createWorld.setBounds(170, 10, 150, 35);
                }
            });

            add(playMP);

            playMP.setBounds(10, 60, 150, 35);

            playMP.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent e) {

                    remove(sound);
                    remove(light);
                    remove(createWorld);
                    repaint();

                    add(addServer);

                    addServer.setBounds(170, 60, 150, 35);
                }
            });

            add(settings);

            settings.setBounds(10, 110, 150, 35);

            settings.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent e) {

                    remove(createWorld);
                    remove(addServer);
                    repaint();
                    add(sound);

                    sound.setBounds(170, 110, 150, 35);
                    sound.setMinimum(0);
                    sound.setMaximum(100);
                    sound.setValueIsAdjusting(true);
                    sound.setValue(soundLevel);
                    sound.setToolTipText("Audio: " + soundLevel + "%");
                    sound.addChangeListener(new ChangeListener() {

                        public void stateChanged(ChangeEvent e) {

                            soundLevel = sound.getValue();

                            sound.setToolTipText("Audio: " + soundLevel + "%");

                            prefs.putInt("SOUND_LEVEL", soundLevel);
                        }
                    });

                    add(light);

                    light.setBounds(330, 110, 150, 35);
                    light.setMinimum(0);
                    light.setMaximum(100);
                    light.setValueIsAdjusting(true);
                    light.setValue(lightLevel);
                    light.setToolTipText("Brightness: " + lightLevel + "%");
                    light.addChangeListener(new ChangeListener() {

                        public void stateChanged(ChangeEvent e) {

                            lightLevel = light.getValue();

                            light.setToolTipText("Brightness: " + lightLevel + "%");

                            prefs.putInt("LIGHT_LEVEL", lightLevel);
                        }
                    });
                }
            });

            add(quit);

            quit.setBounds(10, 160, 150, 35);

            quit.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent e) {

                    System.exit(ABORT);
                }
            });

        }
    }
}

The world list appears when you click the Multiplayer JButton . Also when you click the Multiplayer JButton a JButton appears named Add Server. Effectively when you add a new server that server would appear on the newly created JList.

How would I do this?

edit: By the way the 2 parameters are Strings serverName, and ServerIP.

Answer 1

You Could...

Create a key/value property object which holds the two distinct values. You would then pass this to the JList as a single Object.

You would need to supply a custom cell renderer in order to render the value appropriately.

See How to use lists and Writing a Custom Cell Renderer for more details

You Could...

Use a JTable . While this would allow you to supply each value (key/value) as a separate column, I would still wrap the two in a key/value object, as it would make the management of these values simpler.

This would allow you to interact with each side individually should you wish.

See How to Use Tables for more details

You Should...

Make use of appropriate layout managers. Pixel perfect layouts ( this.setLayout(null); ) are an illusion in modern GUIs. There are so many aspects of the rendering pipeline you simply don't have control over, which would quickly turn your "pretty" layout on your system into alphabet soup on different systems

Take a look at Laying Out Components Within a Container for more details.