The ByteCode Engineering Library (BCEL) is a library that provides a way to directly modify the bytecode of Java classes.

This repository contains slightly modified code for a three-part tutorial at GeekyArticles: Part 1, Part 2, and Part 3.

You need to download BCEL for this example to work.

• Each class in the src folder is run individually.
  • Each one except for DisplayDetails and ExpressionCompiler
    generates a class file called SyntheticClass.class in the bin folder with the other class files.
  • For the classes that generates SyntheticClass you can then run the SyntheticClass to see the results.
    • The tutorial links above give a little more details on how to run each class.
  • ExpresionCompiler takes a string containing an expression as a command line argument and parses it, then generates ExpressionTest.class which displays the result of the expression when its main function is called.