Consumer VS Producer
生产者与消费者模型中，要保证以下几点：
1 同一时间内只能有一个生产者生产
2 同一时间内只能有一个消费者消费
3 生产者生产的同时消费者不能消费
4 消息队列满时生产者不能继续生产
5 消息队列空时消费者不能继续消费
package ying.threadWait;
import java.util.Vector;
public class TestConsumer {
public static void main(String[] args) {
WareHouse warehouse = new WareHouse(0) ;
Producer pro1 = new Producer(15 , warehouse) ;
Consumer cust1 = new Consumer(30 , warehouse) ;
Consumer cust2 = new Consumer(20 , warehouse) ;
Consumer cust3 = new Consumer(15 , warehouse) ;
pro1.start() ;
cust1.start() ;
cust2.start() ;
cust3.start() ;
System.out.println("Bye");
}
}
class WareHouse {
public int cur_size ;
public final static int max_size = 50 ;
public WareHouse() {
}
public WareHouse(int size) {
this.cur_size = size ;
}
public synchronized void produce(int produceNum) {
while (produceNum + cur_size > max_size) {
System.out.println("The quantity of product to produce is " + produceNum
+ " which is over the remaining storage limit : " + (max_size - cur_size));
try {
System.out.println("Producer " + Thread.currentThread().getName() + " waits");
wait() ;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
cur_size += produceNum ;
System.out.println(Thread.currentThread().getName() + " has produced " + produceNum + " pieces of product.");
notifyAll() ;
}
public synchronized void consume(int needNum) {
while (needNum > cur_size) {
try {
System.out.println("Consumer " + Thread.currentThread().getName() + " waits");
wait() ;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
cur_size -= needNum ;
System.out.println("The customer has consumed " + needNum + " pieces of product.");
notifyAll() ;
}
}
class Producer extends Thread {
private int produceNum ;
private WareHouse warehouse ;
Producer(int num , WareHouse house) {
this.produceNum = num ;
this.warehouse = house ;
}
public void run() {
while (true) {
warehouse.produce(produceNum) ;
}
}
}
class Consumer extends Thread {
private int needNum ;
private WareHouse warehouse ;
Consumer(int num , WareHouse warehouse) {
this.needNum = num ;
this.warehouse = warehouse ;
}
public void run() {
warehouse.consume(needNum) ;
}
}
有空时可以参考：http://www.blogjava.net/amigoxie/archive/2007/04/11/110006.html