Java中线程通信的机制
import java.util.LinkedList;
import java.util.List;
/**
*
* @author Jay Chang
*
*/
class Stack {
private List<Object> list = new LinkedList<Object>();
/**
* 出栈
*
* @return
*/
public Object pop() {
return list.remove(list.size() - 1);
}
/**
* 将元素压入栈
*
* @param obj
*/
public void push(Object obj) {
list.add(list.size(), obj);
}
public int size() {
return list.size();
}
}
/**
*
* @author Jay Chang
*
*/
class Producer extends Thread {
private Stack stack;
public Stack getStack() {
return stack;
}
/**
*
* @param stack
*/
public void setStack(Stack stack) {
this.stack = stack;
}
/**
* 生产者生产商品,当商品栈满时,通知消费者消费商品
*/
public void produce() {
for (int i = 0; i < 100; i++) {
// 同步stack
synchronized (stack) {
System.out.println("producer get the lock");
//这里指定存放商品的商品栈的最大容量为10
while (stack.size() == 10) {
try {
//将生产者线程持有stack对象的锁释放,并将生产者线程放到stack对象的等待池中
stack.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
// 模拟生产者生产商品过程所需的时间
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
String goods = "goods" + stack.size();
//将生产的商品放到存放商品的商品栈中
stack.push(goods);
System.out.println("producer product " + goods);
//唤醒在stack对象等待池中的等待的所有线程
stack.notifyAll();
}
}
}
public void run() {
produce();
}
}
class Consumer extends Thread {
private Stack stack;
public Stack getStack() {
return stack;
}
public void setStack(Stack stack) {
this.stack = stack;
}
/**
*
* 消费者消费商品,当商品栈中为空时通知生产者生产商品
*/
public void consume() {
for (int i = 0; i < 100; i++) {
synchronized (stack) {
System.out.println("consumer get the lock");
while (stack.size() == 0) {
try {
stack.wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// 模拟消费者消费商品,所需的时间
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Object obj = stack.pop();
System.out.println("cosumer consume " + obj);
}
}
}
public void run() {
consume();
}
}
public class Test{
public static void main(String[] args) {
Stack stack = new Stack();
Consumer consumer = new Consumer();
consumer.setStack(stack);
Producer producer1 = new Producer();
producer1.setStack(stack);
Producer producer2 = new Producer();
producer2.setStack(stack);
consumer.start();producer1.start();producer2.start();
}
}