Question

How can i get/set the “goal” value?

• So that i can also use it from other class or threads? I tried this but its always giving null or nothing instead of showing me “5” goals.

Main.java:

public class Main
{
  public static String goal = null;
  public static void main(String[] args)
  {
    System.out.println(goal); // shows: null
    MyFunction1();
    System.out.println(goal); // How many goals happend till now?
  }

  public static void MyFunction1()
  {
    new Thread(new Runnable()
    {
      public void run() 
      {
        CallMe();
        System.out.println("show me: " + goal); // shows nothing.
      }
    }).start();
  }

  public static void CallMe()
  {
      ThirdpartySoftware.Bla().connect(new Bla.STATE()
      { 
        public void stateChanged() 
        {         
           System.out.println("Am i running? yes");    
           goal = "5";
           System.out.println("Did i assigned new value to goal? yes");
        } 
      });     
  }

}

Note: I am now separately trying, to fire a event > new thread as abstract interface > implement that interface as a thread and from that thread assign the variable to main class static variable. And then listen on a virtual threads. So in total i may have:
Main > Thread1 > ThirdpartyThred > Abstract interface > Thread2 > Main put/get

Answer 1

Define a Callback interface with a complete method that takes any object as an argument

In the Thread (or Runnable) class pass in the reference to the class that started the thread. When the operation on the thread completes, call the callback method

Java executors: how to be notified, without blocking, when a task completes?