🚀 go-pugleaf

You have move outside the class so become null
Try it like this
 public class MyFrame extends Frame {
    //...
    void someMethod {
       MY_OBJ = new MyObject();
      Main.MY_OBJ.someMethod();  // Main.MY_OBJ becomes null here!

peter
John Yu wrote:

> I experience this problem a couple of times. Please look at the
> following code segments:
>
>   public class Main {
>     static MyObject MY_OBJ;
>
>     static public void main(String[] args) {
>       MY_OBJ = new MyObject();
>       MyFrame frame = new MyFrame();
>       frame.setVisible(true);
>     }
>   }
>
>   public class MyFrame extends Frame {
>     //...
>     void someMethod {
>       Main.MY_OBJ.someMethod();  // Main.MY_OBJ becomes null here!
>       //...
>     }
>   }
>
> MyFrame.someMethod() is called to event a GUI event. I can't
> understand why Main.MY_OBJ becomes null at that point. Moreover, this
> is a random problem. Sometimes it works fine but sometimes doesn't.
>
> Is it a bug in the Java runtime?
>
> Or is it because that the main thread has ended and the Main *class*
> object got garbage collected? (This is a weird thought...)
>
> What complicates the problem more is if I use the debug feature in
> JBuilder to step thru the code, Main.MY_OBJ always retains its value
> and doesn't have a problem!
>
> I'm using JBuilder 2.01 and jdk116_borland.
> --
> John