如何调用一个方法作为对 Java 中另一个方法调用的响应？

Question

Suppose you have a Library L.jar which contains class C.class and a method m .

Now, you have a project which imports this library and uses the m method.

In the project there is class X with method mX .

What I want to do is to somehow monitor all invocations of the method m and invoke the method mX whenever method m gets invoked.

If I can somehow read the parameters which get passed to method m when invoking it, that would be awesome.

Is this possible in Java and if so, how to do it?

Answer 1

There are two approaches. You can either use AspectJ to intercept your program calls. OR You should be wrapping L.jar method m into a class of yours and expose that class to end user. end user should be using this class to invoke m . now you will have full control on who is calling m with which parameters. The downside is that user can always call m directly and bypass your code.