Java基础6
等待唤醒机制---->生产消费问题
/**
*
* @author Jinyan
*
*/
class ResourceProducers
{
private String name;
private int count = 1;
private boolean flagduck = false;
public synchronized void set(String name)
{
while(flagduck)
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
this.name = name + count;
count ++;
System.out.println(Thread.currentThread().getName()
+"--producer-->"+this.name);
flagduck = true;
this.notifyAll();
}
public synchronized void out()
{
while(!flagduck)
//if判断标记，只运行一次，会导致不改运行的线程运行了,
也导致了数据错误的情况
//while判断标记，解决了线程获取执行后，是否要运行
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()
+"--consumer-->"+this.name);
flagduck = false;
this.notifyAll();
//notify()只能唤醒一个线程，如果唤醒了本方线程，
而while判断notify会导致死锁
//notifyAll()解决了，本方线程一定会唤醒对方线程
}
}
class Producer implements Runnable
{
private ResourceProducers rp = new ResourceProducers();
Producer(ResourceProducers rp)
{
this.rp = rp;
}
public void run()
{
while(true)
{
rp.set("Duck");
}
}
}
class Consumer implements Runnable
{
private ResourceProducers rp = new ResourceProducers();
Consumer(ResourceProducers rp)
{
this.rp = rp;
}
public void run()
{
while(true)
{
rp.out();
}
}
}
class ProducerConsumerDemo {
public static void main(String[] args) {
ResourceProducers rp = new ResourceProducers();
Producer p = new Producer(rp);
Consumer c = new Consumer(rp);
Thread t0 = new Thread(p,"脔割");
Thread t1 = new Thread(p,"儿纸");
Thread t2 = new Thread(c,"弟鸽");
Thread t3 = new Thread(c,"办证");
t0.start();
t1.start();
t2.start();
t3.start();
}
}
通过锁对象完成同步
wait和sleep的区别
1.wait可以指定时间也可以不指定
sleep必须指定时间
2.在同步中时，对cpu的执行权和锁的处理不同
wait： 释放执行权，释放锁
sleep：释放执行权，不释放锁
线程的停止
1.stop()
2.run()方法结束
怎么控制线程任务的结束--->通过循环结构控制
定义标记来完成
当线程处于冻结状态时，无法读取标记，此时应该如何停止线程？
interrupt()方法将线程从冻结状态强制恢复到运行状态，
让线程具备cpu的运行资格
但是会发生异常 InterruptedException
join(); 运行至本线程结束
clss Test implements Runnable
{
public void run(Thread t)
{}
}//代码有错吗？
有 错误在第一行 应该被abstract修饰
class ThreadTest
{
public static void public static void main(String[] args) {
new Thread(new Runnable()
{
public void run()
{
System.out.println(Runnable);
}
})
{
public void run()
{
System.out.println(Thread);
}
}.start();
}
}
