My first problem of java exception program (helloworld)

Hello

I am very new to java programming for blackberry, and I read an e-book - blackberry for beginners.

OK, for the moment... I currently have 3 files in/src /...

HelloWorldApp.java

package com.beginningblackberry;

Import net.rim.device.api.ui.UiApplication;

SerializableAttribute public class HelloWorldApp extends UiApplication {}

public HelloWorldApp() {}
TODO auto-generated constructor stub
Screen HelloWorldMainScreen = new HelloWorldMainScreen();
pushScreen (mainScreen);
}

/**
@param args
*/
Public Shared Sub main (String [] args) {}
TODO self-generating method stub
HelloWorldApp app = new HelloWorldApp();
app.enterEventDispatcher ();
}

}

-------------------------------------

HelloWorldMainScreen.java

package com.beginningblackberry;

Import net.rim.device.api.ui.component.LabelField;
Import net.rim.device.api.ui.container.MainScreen;

SerializableAttribute public class HelloWorldMainScreen extends form {}
    
private LabelField labelField;
    
public HelloWorldMainScreen() {}
LabelField labelField = new LabelField ("Hello World");
Add (labelField);
Thread MainScreenUpdaterThread = new MainScreenUpdaterThread (this);
thread. Start();
}
    
{} public void appendLabelText (String text)
        
labelField.setText (labelField.getText () + "\n" + text);
}
}

---------------------------------------------------

MainScreenUpdaterThread.java

package com.beginningblackberry;

Import net.rim.device.api.ui.UiApplication;

SerializableAttribute public class MainScreenUpdaterThread extends Thread {}
    
HelloWorldMainScreen screen;
    
public MainScreenUpdaterThread (screen HelloWorldMainScreen) {}
this.mainScreen = screen;
}

public void run() {}
for (int i = 0; i)< 10;="" i++)="">
try {}
Thread.Sleep (5000);
} catch (InterruptedException ex) {}
}
            
Queue a task on the event thread
UiApplication.getUiApplication () .invokeLater (new Runnable() {}
public void run() {}
mainScreen.appendLabelText ("Update");
}
});
}
}
}

----------------------------------------------------

Okay, that's all the code I wrote so far according to the book it should display "Hello World" - and he does, but when 5 s passes, I get an error 104 of the JVM, the null eception exception pointer, but he should update my screen with "Update" every 5 seconds.

I am writing my code word by Word, to learn as much as possible, but I have no idea how to solve this problem yet

any advice would be greatly appreciated.

BR

It is here:

public HelloWorldMainScreen() {}
LabelField labelField = new LabelField ("Hello World");
Add (labelField);
Thread MainScreenUpdaterThread = new MainScreenUpdaterThread (this);
thread. Start();
}

local variable hides the field from the class. Replace:

public HelloWorldMainScreen() {}
labelField = new LabelField ("Hello World");
Add (labelField);
Thread MainScreenUpdaterThread = new MainScreenUpdaterThread (this);
thread. Start();
}

Tags: BlackBerry Developers

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    I bought 2013 on the easy payment plan, and it's the only thing that is easy. Heartburn, problems threatening patience continues to accumulate.  I can't believe that when I installed windows 2013, my 2010 trial program has expired and none of the programs will open in the new program.  I used Microsoft 3.0 to 5, 8, professional and xp 2010.  Each unique program would automatically begin your files under the new facility.  With this program, unless I'm missing something won't do anything until you open each file - and you have to go through an extremely stressful process to send the file to the computer, open a program and expecting results.  It just has to be wrong.  When I receive an attachment document written in a Word, I can't open it.  I have to save it and go through get its opening in the downloads. Sometimes it works, sometimes it doesn't.  Someone at - it a copy of 2010 or 2007?

    In addition, why can't I talk to the geeks at Microsoft and get a response?

    Hi Jack Burkett,

    I understand the problem you are experiencing. It seems that you are having problems with your office programs.
    Please visit this link for additional assistance.
    Thank you
    Anne_Q.

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