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84 lines (75 loc) · 1.6 KB
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/* 范例名称：生产者--消费者问题
* 源文件名称：SyncTest.java
* 要 点：
* 1. 共享数据的不一致性/临界资源的保护
* 2. Java对象锁的概念
* 3. synchronized关键字/wait()及notify()方法
*/
public class ProducerConsumer {
public static void main(String args[]){
SyncStack stack = new SyncStack();
Runnable p=new Producer(stack);
Runnable c = new Consumer(stack);
Thread t1 = new Thread(p);
Thread t2 = new Thread(c);
t1.start();
t2.start();
}
}
class SyncStack{ //支持多线程同步操作的堆栈的实现
private int index = 0;
private char []data = new char[6];
public synchronized void push(char c){
if(index == data.length){
try{
this.wait();
}catch(InterruptedException e){}
}
this.notify();
data[index] = c;
index++;
}
public synchronized char pop(){
if(index ==0){
try{
this.wait();
}catch(InterruptedException e){}
}
this.notify();
index--;
return data[index];
}
}
class Producer implements Runnable{
SyncStack stack;
public Producer(SyncStack s){
stack = s;
}
public void run(){
for(int i=0; i<20; i++){
char c =(char)(Math.random()*26+'A');
stack.push(c);
System.out.println("produced："+c);
try{
Thread.sleep((int)(Math.random()*1000));
}catch(InterruptedException e){
}
}
}
}
class Consumer implements Runnable{
SyncStack stack;
public Consumer(SyncStack s){
stack = s;
}
public void run(){
for(int i=0;i<20;i++){
char c = stack.pop();
System.out.println("消费："+c);
try{
Thread.sleep((int)(Math.random()*1000));
}catch(InterruptedException e){
}
}
}
}