myeclipse7.5+j2me+wtk2.5.2 一闪而过

j2me的插件是用自带的软件更新
导入wtk后有四个模拟器 选的是DefaultColorPhone
然后找了个hello.java
run as也没错 控制台没报错 但就是一闪而过 debug延迟什么的都调过了
hello.java
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class Hello extends MIDlet implements CommandListener {
private Command exitCommand,backCommand,screenCommand1,screenCommand2;
private TextBox tb;
public Hello() {
exitCommand = new Command("Exit", Command.EXIT, 1);
backCommand = new Command("Back", Command.BACK, 1);
screenCommand1 = new Command("Screen1", Command.SCREEN, 1);
screenCommand2 = new Command("Screen2", Command.SCREEN, 1);
tb = new TextBox("Hello MIDlet", "Hello,lxl!", 15, 0);
}
protected void startApp() throws MIDletStateChangeException {
Display.getDisplay(this).setCurrent(tb);
System.out.println("startApp");
tb.addCommand(exitCommand);