A join point is "a well-defined point in the program flow." 3 There are many types of join points, such as a method call or a method return, which can be either a normal return or a thrown exception.
一个连接点是：一个在程序流程中定义明确的点。3连接点有很多类型，正如一个方法的调用或一个方法的返回，都可以是一个正常的返回或者抛出一个异常。
Normal methods (those without the exclamation point at the end) modify and return a copy of the string they were invoked upon.
常规方法(结尾没有感叹号)修改并返回调用它们的字符串的副本。
Normal methods (those without the exclamation point at the end) modify and return a copy of the string they were invoked upon.
常规方法(结尾没有感叹号)修改并返回调用它们的字符串的副本。
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