主题：程序代码——查看生命周期

import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;

public class Exec extends MIDlet {
        private Display display;
        Form f = new Form("HelloTest");

        // 构造函数
        public Exec() {
                display = Display.getDisplay(this);
                System.out.println("Constructor");
        }

        public void startApp() {
                System.out.println("startApp is called.");
                display.setCurrent(f);
        }

        public void pauseApp() {
                System.out.println("pauseApp is called.");
        }

        public void destroyApp(boolean unconditional) {
                System.out.println("destroyApp is called.");

        }
}