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

Since JDK 1.1, the System.setOut and System.setErr methods are added to enable applications to hook the streams.

Link : http://docs.oracle.com/javase/7/docs/api/java/lang/System.html#setOut(java.io.PrintStream)

http://docs.oracle.com/javase/7/docs/api/java/lang/System.html#setErr(java.io.PrintStream)