一个简单的猜谜游戏的代码(高级用户界面制作)

//MiDlet1.java

package test;

import javax.microedition.midlet.*;import javax.microedition.lcdui.*;

public class MIDlet1 extends MIDlet {    static MIDlet1 instance;    Displayable1 displayable = new Displayable1(Display.getDisplay(this));    public MIDlet1() {        instance = this;    }

    public void startApp() {        Display.getDisplay(this).setCurrent(displayable);    }

    public void pauseApp() {    }

    public void destroyApp(boolean unconditional) {    }

    public static void quitApp() {        instance.destroyApp(true);        instance.notifyDestroyed();        instance = null;    }

}

//Displayable1.java

package test;

import javax.microedition.lcdui.*;

public class Displayable1 extends Form implements CommandListener {    /**题目内容*/    String[] question = {         "花园里都是草。(打一植物)",         "一年后花园里还是草。（也打一植物）",         "来了一只羊。（还打一植物）",         "来了一只狼。（再打一植物）"    };    /**题目选项*/    String[][] answer = {                      {"桃花","草莓","梨花","梅花"},                      {"人参果","梨树","草莓","野梅花"},                      {"野梅花","梨树","草莓","灌木"},                      {"桃花","梅花","梨花","扬梅"}    };    /**正确答案的序号，第一个是0，依次类推*/    int[] rightAnswer={3,3,2,3};

    ChoiceGroup cgQuestion;    /**当前题目编号*/    int index = 0;

    /**确定按键*/    Command cmdOk;

    Display display;    public Displayable1(Display display) {        super("猜谜语");        this.display = display;        //创建题目        cgQuestion = new ChoiceGroup(question[index],ChoiceGroup.EXCLUSIVE);        //填充选择项        for(int i = 0;i < 4;i++){            cgQuestion.append(answer[index][i],null);        }        append(cgQuestion);        cmdOk = new Command("确定",Command.OK,1);        addCommand(cmdOk);        setCommandListener(this);    }

    public void commandAction(Command command, Displayable displayable) {        //确定按钮        if(command == cmdOk){            //获得用户的选择            int selectIndex = cgQuestion.getSelectedIndex();

            //判断是否回答不正确            if(selectIndex != rightAnswer[index]){                Alert a = new Alert("猜谜语","回答错误，请仔细思考！",null,AlertType.INFO);                a.setTimeout(3000);                display.setCurrent(a);                //返回                return;            }

            //如果不是最后一个题目，则显示下一题            if(index < question.length - 1){                index++;                //修改界面显示的内容                cgQuestion.setLabel(question[index]);                //修改选项的内容                for(int i = 0;i < 4;i++){                    cgQuestion.set(i,answer[index][i],null);                }            }else{//显示成功界面                Alert a = new Alert("猜谜语","游戏成功！",null,AlertType.INFO);                a.setTimeout(Alert.FOREVER);                display.setCurrent(a);            }        }    }

}