import java.util.Vector;
class Producer extends Thread {
Queue queue;
Producer(Queue queue) {
this.queue = queue;
}
public void run() {
int i = 0;
while(true) {
queue.add(i++);
}
}
}
class Consumer extends Thread {
String str;
Queue queue;
Consumer(String str, Queue queue) {
this.str = str;
this.queue = queue;
}
public void run() {
while(true) {
System.out.println(str + ": " + queue.remove());
}
}
}
class Queue {
private final static int SIZE = 5;
private Vector queue = new Vector();
private int count = 0;
synchronized void add(int i) {
while(count == SIZE) {
try {
wait();
}
catch(InterruptedException ie) {
ie.printStackTrace();
System.exit(0);
}
}
queue.addElement(new Integer(i));
++count;
notifyAll();
}
synchronized int remove() {
while(count == 0) {
try {
wait();
}
catch(InterruptedException ie) {
ie.printStackTrace();
System.exit(0);
}
}
Integer iobj = (Integer)queue.firstElement();
queue.removeElement(iobj);
--count;
notifyAll();
return iobj.intValue();
}
}
class ProducerConsumers {
public static void main(String args[]) {
Queue queue = new Queue();
new Producer(queue).start();
new Consumer("ConsumerA", queue).start();
new Consumer("ConsumerB", queue).start();
new Consumer("ConsumerC", queue).start();
}
}