Java：仅编译来自另一个类的选定方法

Question

If my java class "UserClass" depends on another class "UsedClass"(provided as a library jar). If the "UsedClass" has 26 methods(lets say A - Z). But my "UserClass" needs only methods from(lets say A to D, assuming they dont internally call any methods other than A to D). When I build the "UserClass", Is there any way to prevent unused methods(example E to Z) from "UsedClass" from being shipped in my application(which may increase size of distributable/memory consumption while execution).

Answer 1

Don't do premature optimisation, in most cases it is the libraries who adding size to your project. If your methods not used any there then just delete then. If the are used by some other unrelated code then you better split your code into modules so you can use them in a different combination. As I already said your code(the code you created) will be the smallest part of your final application. If you still insist that you want to conditionally compile methods, then I will say it isn't possible with standard tools.