AspectJ提供了许多种类的连接点集合，但是本篇只介绍它们中的一个：方法调用连接点集(method call join points)。一个方法调用连接点捕捉对象的方法调用。
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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。
The second pointcut, employeeFinanceUpdates, describes all join points where there is a call to any method that begins with update, ends with Info, and has one argument of type Employee.
第二个切点， employeeFinanceUpdates, 描述了所有以 update开头， 以 Info, 结尾的，具有一个Employee类型实参的方法的调用点。
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