package test;
public class ThreadTest {
private Object lock = new Object();
private int i = 0;
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ThreadTest threadTest = new ThreadTest();
Thread1 th1 = threadTest.new Thread1();
Thread2 th2 = threadTest.new Thread2(th1);
th1.start();
th2.start();
}
private class Thread1 extends Thread{
@Override
public void run() {
while (true) {
synchronized (lock) {
try {
if (i > 10 && i < 20) {
lock.wait();//如果只有wait(),则默认调用this.wait(),实际上并未获得this的锁,所以会报错IllegalMonitorStateException
//yield();
}
System.out.println("Thread1:" +(++i));
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
private class Thread2 extends Thread {
private Thread1 preThread;
public Thread2(Thread1 thread){
this.preThread=thread;
}
@Override
public void run() {
while (true) {
synchronized (lock) {
System.out.println("Thread2:" +(++i));
try {
preThread.join();
if (i > 20) {
lock.notify();
lock.wait();
}
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
}
自己并不拥有的对象,java.lang.IllegalMonitorStateException
java.lang.IllegalMonitorStateException
违法的监控状态异常。当某个线程试图等待一个自己并不拥有的对象(O)的监控器或者通知其他线程等待该对象(O)的监控器时,抛出该异常。
这是网上的解释,我不是很明白,什么叫“自己并不拥有的对象”,我是在一个对象调用wait();在另一个对象调用notifyAll()
------解决方法--------------------------------------------------------
如果不正确地管理wait/notify调用,应用程序可能会抛出IllegalMonitorStateException,例如,若不拥有对象的锁标记,而试图用wait/notify协调共享对象资源,应用程序将抛出IllegalMonitorStateException。
IllegalMonitorStateException意味着一个或多个资源可能不再处于一致状态,表示程序出现了严重问题。由于IllegalMonitorStateException是RuntimeException类型,因此它可能中断产生异常的线程。