java - How to access a Runnable object by Thread?

Question

Possible duplicate: need-help-returning-object-in-thread-run-method

Hello. I have a class implementing runnable and I have a List, storing Threads instantiated with different objects of that class. How can I access properties of underlying objects given the thread object running them? Here is an example:

public class SO {
    public static class TestRunnable implements Runnable {
        public String foo = "hello";

        public void run() {
            foo = "world";
        }
    }

    public static void main(String[] args) {
        Thread t = new Thread(new TestRunnable());
        t.start();
        //How can I get the value of `foo` here?
    }
}

Answer 1

I don't see any way to do it in the java.lang.Thread docs.

My best answer, then, is that you probably should be using List<Runnable> instead of (or in addition to) List<Thread>. Or perhaps you want some sort of map structure so that you can access the Runnable from the Thread. (For example, java.util.HashMap<java.lang.Thread, java.lang.Runnable>)