Java (Eclipse) - Conditional compilation

Question

I have a java project that is referenced in j2me project and in android project. In this project i would like to use conditional compilation.

Something like...

//#if android
...
//#endif

//if j2me
...
//#endif

I have been reading about this but i did not find anything useful yet.

Answer 1

You could use Antenna (there is a plugin for Eclipse, and you can use it with the Ant build system). I'm using it in my projects in a way you've described and it works perfectly :)

EDIT: here is the example related to @WhiteFang34 solution that is a way to go:

In your core project:

//base class Base.java
public abstract class Base {
    public static Base getInstance() 
    {
        //#ifdef ANDROID
        return new AndroidBaseImpl();
        //#elif J2ME
        return new J2MEBaseImpl();
        //#endif
    }

    public abstract void doSomething();
}

//Android specific implementation AndroidBaseImpl.java
//#ifdef ANDROID
public class AndroidBaseImpl extends Base {
    public void doSomething() {
     //Android code
    }
}
//#endif

//J2ME specific implementation J2MEBaseImpl.java
//#ifdef J2ME
public class J2MEBaseImpl extends Base {
    public void doSomething() {
        // J2Me code
    }
}
//#endif

In your project that uses the core project:

public class App {

    public void something {
        // Depends on the preprocessor symbol you used to build a project
        Base.getInstance().doSomething();
    }
}

Than if you want to build for the Android, you just define ANDROID preprocessor symbol or J2ME if you want to do a build for a J2ME platform...

Anyway, I hope it helps :)