I'm a longtime C++ programmer, new to Java. I'm developing a Java Blackberry project in Eclipse. Question - is there a way to introduce different configuration sets within the project and then compile slightly different code based on those?
In Visual Studio, we have project configurations and #ifdef; I know there's no #ifdef in Java, but maybe something on file level?
Besides Maven, Ant and other build tools that provide similar functionality, one would rather build interfaces in Java and switch the implementations at Runtime.
See the Strategy Pattern for more details
In opposite to C/C++ this will not come with a big performance penality, as Javas JIT-compiler optimizes at runtime and is able to inline this patterns in most cases.
The big pro of this pattern is the flexibility - you can change the underlying Implementation without touching the core classes.
You should also check IoC and the Observer Pattern for more details.