import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;


public class Task extends Thread{

        private int result;
        private final Lock computeLock = new ReentrantLock();
        private boolean computed = false;

        private final Condition canGet = computeLock.newCondition();

        private int compute() {
            int val;

            val = 543;
            return val;
        }

        public int getResult() {

            computeLock.lock();

            try {

                while (!computed) {
                    try {
                        canGet.await();
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }

                return result;
            } finally {
                computeLock.unlock();
            }
        }

        public void run() {
            computeLock.lock();

            try {

                result = compute();
                computed = true;
                canGet.signalAll();
            } finally {
                computeLock.unlock();
            }
        }

}


import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;


public class TestMe {

    /**
     * @param args
     */
    public static void main(String[] args) {

        while (true) {
        Task task1 = new Task();
        Task task2 = new Task();

        ExecutorService threadExecutor = Executors.newCachedThreadPool();

        threadExecutor.execute(task1);
        threadExecutor.execute(task2);


        threadExecutor.shutdown();


        System.out.println("result = " + (task1.getResult() + task2.getResult()));


        try {
            threadExecutor.awaitTermination(1, TimeUnit.DAYS);
        } catch (InterruptedException ex) {
            System.err.println("Something bad happened: " + ex.getMessage());
        }



        }
    }

}