[toscaty]

I have a thread that sleeps and then repaints the main screen. I launch the thread in the main screen class and i can then use getname to avoid relaunching, but in other places in the same class i get a null for the Thread??

class MainWindow extends MainScreen
{
    private Font myfont;
    private MyThread thread1;
    MainWindow() {
        
        super();
 
        
        String thn = Thread.currentThread().getName();
        if (thn == "scrpaint") 
        {
        }
        else 
        {
        MyThread thread1 = new MyThread ("scrpaint");
        System.out.println("Thread 1: "+ thread1.t.isAlive());
        System.out.println("Thread name is " + thread1.t.getName());
        }

but 5 lines down if I try to get the Thread name using

System.out.println("Thread name is " + thread1.t.getName());

- the Thread is Null?? and my app throws a null pointer exception
Any ideas why? I want to interrupt the thread and display another screen and then resume...

[nanika]

Apparently, you mask your thread1 member with a variable local to the constructor. The former is never set.

[toscaty]

I am not sure that I follow what you mean? Can you describe in laymans terms what you mean? what am I masking the thread with ?

[CELITE]

Could you show us the implementation of MyThread?

[toscaty]

Sure

Here it is

class MyThread implements Runnable {
  String tName;
  Thread t;
  MyThread (String threadName) {
     tName = threadName;
     t = new Thread (this, tName);
     t.start();
  }
  public void run() {
     for (int i = 0; i < 100; i++)
              {
     try {
            System.out.println("Thread: " + tName ); 
            
            synchronized  (Application.getEventLock()){
                     Screen cursc =   UiApplication.getUiApplication().getActiveScreen();
                     System.out.println(cursc);
                     
                    UiApplication.getUiApplication().pushScreen(new MainWindow());
                    }
            Thread.sleep(5000);
          } 
          catch (InterruptedException e ) {}

     System.out.println("End of Thread running" );
               }
          }
   
}

[toscaty]

Well I have to say that getting control and access to threads in the JVM is a major pain. I resorted in the end to leaving the thread and not trying to stop or access it but within its try I set a while(boolean) then set the value of the boolean in other screens to stop the Thread running or processing rather, seems to work quite well - this link was a help

156939-thread-null-elsewhere-same-class.html

I dont understand why there is no stop method or kill method

[simon.hain]

see this link for an explaination of your initial problem.
remove the re-declaration from the following line

MyThread thread1 = new MyThread ("scrpaint");