russiamidlet.java

一个俄罗斯方块的代码,对于j2me的初学者比较适合

import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
public final class RussiaMIDlet extends MIDlet {
    private static final String[] OPTIONS = {"新游戏", "继续", "排行", "退出"};
    private static RussiaMIDlet instance = null;
    private Display display = null;
    private List welcome = null;
    private MyCanvas canvas = null;
    public RussiaMIDlet() {
        instance = this;
        display = Display.getDisplay(this);
    }
    protected void startApp() {
        if(welcome==null) {
            welcome = new List("俄罗斯方块", List.IMPLICIT, OPTIONS, null);
            welcome.setCommandListener(new WelcomeListener(welcome));
        }
        display.setCurrent(welcome);
    }
    protected void pauseApp() {
    }
    protected void destroyApp(boolean unconditional) {
    }
    public static void quitApp() {
        if(instance!=null) {
            instance.destroyApp(true);
            instance.notifyDestroyed();
        }
    }
    public static void setDisplay(Displayable d) {
        instance.display.setCurrent(d);
    }
}
class WelcomeListener implements CommandListener {
    private List list;
    public WelcomeListener(List list) { this.list = list; }
    public void commandAction(Command c, Displayable d) {
        if(c==List.SELECT_COMMAND)
            switch(list.getSelectedIndex()) {
            case 0:
                RussiaMIDlet.setDisplay(new MyCanvas(false));
                break;
            case 1:
                RussiaMIDlet.setDisplay(new MyCanvas(true));
                break;
            case 2:
                break;
            case 3:
                RussiaMIDlet.quitApp();
            }
    }
}