For whether the listener is registered before registering it , and throw an exception or log an error if it is , so that evidence of the coding error can be gathered and acted on ，在登记侦听器之前检查是否已经登记了，如果已经登记，就抛出异常（或记录错误） ，这样就可以搜集编码错误的证据，并采取行动。
Threads can disappear when they throw an uncaught exception or error , or they might simply stop working when they wait on an i o operation that will never complete or a monitor for which no one will ever call 当线程抛出未捕获的异常或错误时它们可能消失；而当线程等待的i / o操作永远不会完成，或没人为它们等待的监视器调用
Programs written in java code aren t susceptible to buffer overflow attacks , but such an attack can still throw an unexpected exception or even an error - potentially shutting down a server or other program 使用java编写的程序对缓冲区溢出攻击并不敏感，但这样的攻击会导致不断地抛出意外异常或错误可能导致服务器或其他程序关闭。
Because the java language does not require methods to catch or specify runtime exceptions , it s tempting for programmers to write code that throws only runtime exceptions or to make all of their exception subclasses inherit from 因为java语言并不要求方法捕获或者指定运行时异常，因此编写只抛出运行时异常的代码或者使得他们的所有异常子类都继承自
Monitoring software transfer measuring data from local machine to remote machine by data packet . lf there are some exception or abnormality in local device . the system can send alarm message to remote user by gsm short message 当水质参数超标或系统运行出现异常时，监控软件在记录事件及数据的同时，通过gsm短消息的方式将报警信息传递给远程监护人员。
Most thread pool implementations guard against this by catching thrown exceptions or restarting threads that die , but the problem of thread leakage is not limited to thread pools - server applications that use threads to service work queues can have this problem too 大多数线程池实现通过捕获抛出的异常或重新启动死亡的线程来防止这一点，但线程泄漏的问题并不仅限于线程池使用线程来为工作队列提供服务的服务器应用程序也可能具有这种问题。
I beg you most sincerely from all the family , my dear . these words , invariably accompanied by the same expression on his full , good - humoured , clean - shaven face , and the same warm pressure of the hand , and repeated short bows , he said to all without exception or variation 我代表全家人诚挚地邀请您， machre 。 ”他毫无例外地，一字不变地对一切人都说这番话，他那肥胖的愉快的常常刮得很光的脸上现出同样的神态，他同样地紧握来宾的手，频频地鞠躬致意。
Exceptions were supposed to make code smaller by centralizing error handling , but a method with three lines of code and six catch blocks each of which either just logs the exception or wraps and rethrows it seems kind of bloated and can obfuscate otherwise simple code 异常是通过集中错误处理来设想减小代码的，但是一个具有三行代码和六个catch块（其中每个块只是记录异常或者包装并重新抛出异常）的方法看起来比较膨胀并且会使得本来简单的代码变得模糊。
