import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;

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

        // 构造函数
        public Exec() {
                display = Display.getDisplay(this);
                cmd = new Command("暂停", Command.SCREEN, 2);
                f.addCommand(cmd);
                f.setCommandListener(this);
                display.setCurrent(f);
                System.out.println("Constructor");
        }

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

        }

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

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

        }

        public void commandAction(Command c, Displayable s) {
                System.out.println("commandAction");
                pauseApp();
                notifyPaused();
        }
}