我仍在按照 oracle 网站的 java 教程学习线程。
关于wait() 和notifyAll()，我写了一些代码。guardedJoy(GuardedBlock guardedBlock)我的预期输出是在 run() 中打印消息 10 次，并在 run方法中将“joy”设置为 false 时在方法中打印“Fun stop by StopFun Thread”消息。
这是我的代码。
public class GuardedBlock {
private boolean joy = true;
public synchronized void guardedJoy(GuardedBlock guardedBlock) {
System.out.println(Thread.currentThread().getName() + " Guard Joy method started");
while (guardedBlock.joy) {
try {
System.out.println(Thread.currentThread().getName() + " Going to waiting state");
guardedBlock.wait();
} catch (InterruptedException ex) {
}
}
System.out.println("Fun stopped by StopFun Thread");
}
private static class StopFun implements Runnable {
private GuardedBlock guardedBlock;
public StopFun(GuardedBlock guardedBlock) {
this.guardedBlock = guardedBlock;
}
@Override
public void run() {
for (int x = 0; x < 100; x++) {
try {
Thread.sleep(500);
System.out.println("Allowing fun since its only " + x + " times - " + Thread.currentThread().getName());
if (x == 10) {
guardedBlock.joy = false;
guardedBlock.notifyAll();
break;
}
} catch (InterruptedException ex) {
}
}
}
}
public static void main(String[] args) {
GuardedBlock guardedBlock = new GuardedBlock();
StopFun sf = new StopFun(guardedBlock);
Thread stopFun = new Thread(sf);
stopFun.start();
guardedBlock.guardedJoy(guardedBlock);
}
}
run 方法中的代码运行良好，但之后会抛出这样的异常。
Exception in thread "Thread-0" java.lang.IllegalMonitorStateException
at java.lang.Object.notifyAll(Native Method)
at Synchronization.GuardedBlock$StopFun.run(GuardedBlock.java:38)
at java.lang.Thread.run(Thread.java:748)
我在这个和这个网站上经历了几个问题和答案，但无法弄清楚我到底做错了什么。一个帮助是非常有价值的。
谢谢。