為什么此代碼會引發IllegalMonitorStateException？

Question

請向我解釋為什么我的代碼在wait函數上拋出IllegalMonitorStateException ，據我所知這僅在未在同步部分完成的情況下才會發生？

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

您只能在該對象的synchronized塊內調用wait() 。

在synchronized (targetW)內部，可以調用targetW.wait() 。