Question

Let’s say I have one thread running (I’m creating many instances of this thread), and inside that I instantiate a JForm. While being inside that JForm, I call another JForm. Think of it as a multiple step registration process. When I’m inside the second form, will the previously created thread still be inside the run()? Or is the new JForm creating a new thread? I want to keep the first thread alive and access a shared resource through out the lifetime of it.

class Form1 extends JForm{
   public void jButton1ActionPerformed(..){
      ///show Form2
   }
}
class A extends Thread{
  public void run() {
     //show Form1
  }
}

class Main {
 public static void main(String args[]){
    new A().start();
    new A().start();
    new A().start();
}

Thanks.

Answer 1

When you create and run your A thread, you will simply show the Form and continue executing that Thread. Separately, on the single, dedicated Swing Thread (started automatically for you) the users click will be caught and handled, resulting in a call to jButton1ActionPerformed. That code block will execute inside the Swing thread.

Hope that helps. Note that you can name your threads and always use Thread.currentThread().getName() to help you understand further what is going on in your code.