帮忙看段程序
//书上的，但是我用wtk2.3运行后得不出应该的结果。应该是一开始点退出consule里会打印出因为unconditional为false的异常吧，然后再点一次才正常退出。
大家试试是什么结果
我怀疑wtk有问题。。特别是异常处理的问题
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
/**
* A MIDlet which demonstrates the lifecycle of a MIDlet
* @author Martin J. Wells
*/
public class LifecycleTest extends javax.microedition.midlet.MIDlet
implements CommandListener
{
private Form form;
private Command quit;
private boolean forceExit = false;
/**
* Constructor for the MIDlet which creates a simple Form, adds some text and
* an exit command. When called this method will also write a message to the
* console. This is used to demonstrate the sequence of events in a MIDlet 's
* lifecycle.
*/
public LifecycleTest()
{
System.out.println( "Constructor called. ");
form = new Form( "Life, Jim. ");
form.append( "But not as we know it. ");
form.setCommandListener(this);
// Create and add two commands to change the MIDlet state
quit = new Command( "Quit ", Command.SCREEN, 1);
form.addCommand(quit);
}
/**
* Called by the Application Manager when the MIDlet is starting or resuming
* after being paused. In this example it acquires the current Display object
* and uses it to set the Form object created in the MIDlet constructor as
* the active Screen to display. Also displays a message on the console when
* called to demonstrate when this method is called in the MIDlet lifecycle.
* @throws MIDletStateChangeException
*/
protected void startApp() throws MIDletStateChangeException
{
System.out.println( "startApp() called. ");
Display.getDisplay(this).setCurrent(form);
}
/**
* Called by the MID 's Application Manager to pause the MIDlet. A good
* example of this is when the user receives an incoming phone call whilst
* playing your game. When they 're done the Application Manager will call
* startApp to resume. For this example we output a message on the console
* to indicate when this method is called in the MIDlet 's lifecycle.
*/
protected void pauseApp()
{
System.out.println( "pauseApp() called. ");
}
/**
* Called by the MID 's Application Manager when the MIDlet is about to
* be destroyed (removed from memory). You should take this as an opportunity
* to clear up any resources and save the game. For this example we output a
* message on the console to indicate when this method is called in the
* MIDlet lifecycle.
* @param unconditional if false you have the option of throwing a
* MIDletStateChangeException to abort the destruction process.
* @throws MIDletStateChangeException
*/
protected void destroyApp(boolean unconditional) throws MIDletStateChangeException
{
System.out.println( "destroyApp( " + unconditional + ") called. ");
if (!unconditional)
{
// we go through once using unconditional, next time it 's forced.
forceExit = true;
}
}
/**
* The CommandListener interface method called when the user executes a
* Command, in this case it can only be the quit command we created in the
* constructor and added to the Form. We also output a console message when
* this method is called.
* @param command the command that was triggered
* @param displayable the displayable on which the event occurred
*/
public void commandAction(Command command, Displayable displayable)
{
System.out.println( "commandAction( " + command + ", " + displayable +
") called. ");
try
{
if (command == quit)
{
destroyApp(forceExit);
notifyDestroyed();
}
}
catch (MIDletStateChangeException me)
{
System.out.println(me + " caught. ");
}
}
}
[解决办法]
destroyApp(FALSE)为正常退出。。。
[解决办法]
同意楼上的
正常退出用false,
强制退出用true,很可能会丢失信息，比如采用缓冲机制的的 rms在强制退出时就可能丢失
一般来讲，只用false就好了
[解决办法]
同意楼上的！！！！！！！
