为什么此代码会引发IllegalMonitorStateException？

Question

请向我解释为什么我的代码在wait函数上抛出IllegalMonitorStateException ，据我所知这仅在未在同步部分完成的情况下才会发生？

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块内调用wait() 。

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