如题，这个方法书上只是写了4个参数的意思，和整个函数的作用。但是却没有例子，我自己试了下，发现没用对。
现在求一例子，最好能带上注释，谢谢了
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Midlet主类
- Java code
import javax.microedition.midlet.*;import javax.microedition.lcdui.*;public class MainMidlet extends MIDlet { private static MainMidlet instance; private static Display display; public MainMidlet() { instance = this; display = Display.getDisplay(this); CalendarForm calendarForm = new CalendarForm("日期Form"); display.setCurrent(calendarForm); } public void startApp() { } public void pauseApp() { } public void destroyApp(boolean unconditional) { } public static void quitApp() { instance.destroyApp(true); instance.notifyDestroyed(); instance = null; } public static Display getDisplay() { return display; }}