Java Consumer-Producer example

import java.util.LinkedList; 
import java.lang.Thread;

class Test {

    class BlockingQueue {
        public BlockingQueue(int size) {
            this.size = size;
        }

        public synchronized int get() {
            try {
            while (this.queue.size() == 0) {
                wait();
            }
            } catch (Exception e) {}

            if (this.queue.size() == this.size) {
                notifyAll();
            }
            int result = this.queue.removeLast();
            return result;
        }

        public  synchronized void put(int val) {

            try {
            while (this.queue.size() == this.size) {
                wait();
            } } catch (Exception e) {}

            if (this.queue.size() == 0) {
                notifyAll();

            }
            

            this.queue.addFirst(val);
            System.out.println("queue size: " + this.queue.size());
        }

        private LinkedList<Integer> queue = new LinkedList<Integer>();
        private int size;
    };

    class Producer implements Runnable {
        public Producer(BlockingQueue products) {
            this.products = products;
        }

        public void run() {
            int id = 0;
            while (true) {
                try {
                Thread.sleep(1000);
                } catch(Exception e) {}
                    System.out.println("produced product " + id);
                products.put(id++);
                
            }
        }

        private BlockingQueue products;
    };

    class Consumer implements Runnable {
        public Consumer(BlockingQueue products) {
            this.products = products;
        }

        public void run() {
            while (true) {
                try {
                Thread.sleep(1000);
                } catch(Exception e) {}
                int p = products.get();
                System.out.println("consumed product " + p);
            }
        }

        private BlockingQueue products;
    };

    public void test() {
        BlockingQueue q = new BlockingQueue(20);
        Producer p = new Producer(q);
        Consumer c = new Consumer(q);
        new Thread(p).start();
        new Thread(c).start();
    }

    public static void main(String[] args) {
        Test t = new Test();
        t.test();
    }
};