Hooking an existing method in Java

Question

I want to hook the method System.out.print in Java and have the ability to read/change the variables used in the method before the part of the method is called that actually add

Answer 1

You can rewrite the byte code of the methods, and in the process capture/change the local variables. It is not trivial. See some notes here.

Maybe what you really want is a java debugger? You can connect a debugger to a remote process, add a breakpoint, and capture/change the local variables pretty easily using eclipse.

What is the real problem you are trying to solve?