这里,注意到locations使用了ConcurrentMap这个线程安全的Map,使用装饰器模式,将它转换为不可修改的Map后,发布没有任何线程安全问题,而且也解决了车辆位置的时效性问题:因为发布的是实时locations。这里的Point类也是线程安全的,可以直接通过getLocation()方法发布: publicclassPoint {publicfinalintx, y;publicPoint(intx,...
细心的读者肯定发现了,MonitorVehicleTracker类中几乎每一个方法都要复制MutablePoint或者locations的值,原因在于,这俩不是线程安全的,不能直接发布出去,所以只能发布一个副本,但是这又出了新的问题:虽然MonitorVehicleTracker类是线程安全的,但是由于数据都是复制的,那么假设线程A调用了getLocations()方法得到了位置,此时...
In the example above, what if obj.execute1() throws a Runtimeexception, then the code exits? Edited: This guy seems to answer a lot of my questions, but I still want to hear your opinions. http://misko.hevery.com/2009/09/16/checked-exceptions-i-love-you-but-you-have-to-go/ "Che...
It’s one of the important topics for java interview questions. Here I am listing some important java collections interview questions and answers to help you in the interview. This is directly coming from my 14+ years of experience in Java programming.Java Collections Interview QuestionsWhat are ...
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