Queue.java Source code

Introduction

Here is the source code for Queue.java

Source

import java.util.concurrent.Semaphore;

class Queue {
    int value;

    static Semaphore semCon = new Semaphore(0);

    static Semaphore semProd = new Semaphore(1);

    void get() {
        try {
            semCon.acquire();
        } catch (InterruptedException e) {
            System.out.println("InterruptedException caught");
        }
        System.out.println("Got: " + value);
        semProd.release();
    }

    void put(int n) {
        try {
            semProd.acquire();
        } catch (InterruptedException e) {
            System.out.println("InterruptedException caught");
        }

        this.value = n;
        System.out.println("Put: " + n);
        semCon.release();
    }
}

class Producer implements Runnable {
    Queue q;

    Producer(Queue q) {
        this.q = q;
        new Thread(this, "Producer").start();
    }

    public void run() {
        for (int i = 0; i < 20; i++)
            q.put(i);
    }
}

class Consumer implements Runnable {
    Queue q;

    Consumer(Queue q) {
        this.q = q;
        new Thread(this, "Consumer").start();
    }

    public void run() {
        for (int i = 0; i < 20; i++)
            q.get();
    }
}

public class ProdCon {
    public static void main(String args[]) {
        Queue q = new Queue();
        new Consumer(q);
        new Producer(q);
    }
}