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while 和if的差别

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alienation

#1 Created at ... [Delete] [Delete and Lock User]

如果是用while作判断，每次wait被notify唤醒后都要先判断当前队列是否为空，而if做判断时，如果wait被唤醒，则不管三七二十一直接获取队列元素，此时如果队列元素被其他线程取走，那么该线程就报nosuchelement exception

langxc

#2 Created at ... [Delete] [Delete and Lock User]

用if为啥就不走判断了？

养鸡户蔡广坤

#3 Created at ... [Delete] [Delete and Lock User]

不是不走判断,是if只走一次,执行wait()的时候,if已经执行过了

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