How to mark java code such that it's not compiled [duplicate]

Answer 1

There's not a Java-equivalent of the preprocessor's directive used in C/C++ languages. Anyhow, you could do something similar using annotations or ANT, as briefly explained here

Using annotations to add C like preprocessor directives

or here

How to do Conditional Compilation with Java

Answer 2

Instead of trying to make the code conditional by preprocessing the source-code (as C does), use object oriented programming: use design patterns such as Strategy, and dependency injection, to make code conditional.

Answer 3

There are several solutions:

1. Use a preprocessor - I think that it will work with the standard CPP. There were some Java specific proprocessors as jappo and java+ that you can try

2. Replace the #if 0 with a true if:

   if(false) { code }

The condition can be refined by querying the system properties:

 if(System.getProperty("NO_COMPILE").equals("true")) {
    code
  } 

This has the advantage that it can be easily set either from ANT or from Eclipse.

EDIT: Please remark that with if the code will actually be compiled and present in the .class files. Moreover, although querying system properties is more elegant, is done at runtime not at compile time hence is not quite inline with original requirement. The if(false) is on a 2nd tought better.

EDIT2: an even better solution I have just found: http://prebop.sourceforge.net/