🚀 go-pugleaf

I read somewhere that, for the most part, Swing was not Thread-safe.  
Naturally, I need some sort of idea of what I should avoid, what will get 
me into problems, and so forth.

Where is anything about GUI/thread processing and problems documented?  
Nowhere in the Java Tutorial from Sun.  The threads book from Java 
doesn't seem to focus on the combination of mixing GUI with threads.

Is every GUI processing method called from a new thread you just started 
supposed to be synchronized to avoid accessing a graphical component from 
two threads?

In particular, what happens when you update a graphical component from 
two threads at the same time?  If a graphical component is being updated 
and you alter the component, what happens?  Is it safe?  Should we be 
avoiding this?  Can you exit when graphical updates are occurring?

Who knows anything about this?