Fork Join Framework Help

Question

Hello,
I've been reading into the Fork/Join Framework. From what i have read so far the Fork Join Framework is brilliant. It offers a solution for true multicore processing. However im struggling to get my head around how you would use it to execute two different tasks. For example i have written the following very simple application using Threads. As the methods below do not return a value i know that RecrusiveAction would be used from the Fork Join Framework, however im not sure how to implement.
package threads;
import java.util.concurrent.Semaphore;
* @author steven.haynes
class Queue {
static Semaphore semConsumer = new Semaphore(0);
static Semaphore semProducer = new Semaphore(1);
String displayText;
String get() {
try {
semConsumer.acquire();
} catch (InterruptedException e) {}
System.out.println("Got: " + displayText);
semProducer.release();
return displayText;
void put(String displayText) {
try {
semProducer.acquire();
} catch (InterruptedException e) {}
this.displayText = displayText;
System.out.println("Put: " + displayText);
semConsumer.release();
class Producer implements Runnable {
Queue queue;
Producer(Queue queue) {
this.queue = queue;
new Thread(this, "Producer").start();
public void run() {
while (true) {
queue.put("Hello World");
try {
Thread.sleep(5000);
} catch (InterruptedException e) {}
class Consumer implements Runnable {
Queue queue;
Consumer(Queue queue) {
this.queue = queue;
new Thread(this, "Consumer").start();
public void run() {
while (true) {
queue.get();
try {
Thread.sleep(5000);
} catch (InterruptedException e) {}
class Concurrent {
public static void main(String args[]) {
System.out.println("Starting threads. Press Ctrl + C to exit.");
Queue queue = new Queue();
new Producer(queue);
new Consumer(queue);
Thanks,

Answer 1

I don't quite understand your point....
First, why would you create a semaphore with 0 permits ?
I copy/pasted your code and it seems to do what it's supposed to do...