线程报错--多生产多消费的高效率模式(不是很明白这个和lock、condition有什么区别)

[time倾听下]

package itcast.messagethread71;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/*
Lock:
一个锁上多个监视器对象

*/
public class MessageThread71 {
public static void main(String[] args) {
Resource r = new Resource();
Producer p = new Producer(r);
Consumer c = new Consumer(r);
Thread t1 = new Thread(p);
Thread t2 = new Thread(p);
Thread t3 = new Thread(c);
Thread t4 = new Thread(c);
t1.start();
t2.start();
t3.start();
t4.start();
}
}
class MyLock
{
public static final Object LOCKA = new Object();
public static final Object LOCKB = new Object();
}
class Resource
{
private String name;
private int count = 1;
private boolean flag;//是否有商品的标记
public void set(String name)
{
synchronized(MyLock.LOCKA)
{
while(flag)
{
try {
wait();//t1(醒了),t2 t1醒了唤醒了t2
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.name = name + "--" + count;
count++;
System.out.println(Thread.currentThread().getName() + "生产了 ，" + this.name);
flag = true;
MyLock.LOCKB.notify();
}
}
public void get()//synchronized(this)写的有点冤，就直接同步函数就行了
{
synchronized(MyLock.LOCKB)
{
while(!flag)
{
try {
wait();//t3,t4
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println(Thread.currentThread().getName() + "消费了......" + this.name);
flag = false;
MyLock.LOCKA.notify();
}
}

}
class Producer implements Runnable
{
private Resource r;
Producer(Resource r)
{
this.r = r;
}
public void run() {
while(true)
{
r.set("蛋糕");
}
}

}
class Consumer implements Runnable
{
private Resource r;
Consumer(Resource r)
{
this.r = r;
}
public void run() {
while(true)
{
r.get();
}
}
}

[time倾听下]

报错： Thread-0生产了 ，蛋糕--1 Thread-2消费了......蛋糕--1 Thread-1生产了 ，蛋糕--2 Exception in thread "Thread-0" java.lang.IllegalMonitorStateException at java.lang.Object.notify(Native Method) at itcast.messagethread71.Resource.set(MessageThread71.java:53) at itcast.messagethread71.Producer.run(MessageThread71.java:85) at java.lang.Thread.run(Thread.java:619) Exception in thread "Thread-2" java.lang.IllegalMonitorStateException at java.lang.Object.notify(Native Method) at itcast.messagethread71.Resource.get(MessageThread71.java:70) at itcast.messagethread71.Consumer.run(MessageThread71.java:100) at java.lang.Thread.run(Thread.java:619) Exception in thread "Thread-1" java.lang.IllegalMonitorStateException at java.lang.Object.notify(Native Method) at itcast.messagethread71.Resource.set(MessageThread71.java:53) at itcast.messagethread71.Producer.run(MessageThread71.java:85) at java.lang.Thread.run(Thread.java:619) Exception in thread "Thread-3" java.lang.IllegalMonitorStateException at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:485) at itcast.messagethread71.Resource.get(MessageThread71.java:63) at itcast.messagethread71.Consumer.run(MessageThread71.java:100) at java.lang.Thread.run(Thread.java:619)

[time倾听下]

楼主觉得是不是每次唤醒的对象不明确，都是new Object()的？