java - 为什么这段代码会抛出 IllegalMonitorStateException？

Question

请向我解释为什么我的代码在等待函数中抛出 IllegalMonitorStateException ，据我所知，只有在同步部分未完成时才会发生这种情况？

private void deliver(int target) {
    Warehouse targetW = targets[target];
    targetW.deliver();
    System.out.println(name + " starts to deliver too " +
                       targetW.getName());
    int sleepTime = DELIVERY_TIME / LOADING_CAPACITY;
    int counter = 0;
    while (counter < LOADING_CAPACITY) {
        synchronized (targetW) {
            while (!targetW.fill(1)) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        counter++;
        try {
            sleep(sleepTime);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    leaveMSG(targetW);
    targetW.delivered();
}

Answer 1

您只能在该对象的synchronized block 内调用wait()。该对象。

在synchronized(targetW)内，您可以调用targetW.wait()。