Java: using polymorphism to avoid if-statements?

Question

I\'m attempting to write a java program that initializes certain layouts based on what the user selects. What I want to do is try to avoid writing a bunch of if-statements s

Answer 1

You should use a framework to avoid if's to create o define behavior.

Spring lets us to manage and solve this issue. It uses a factory pattern and more design patterns. So using annotations or xml configuration file you can decide what classes create. PD: Of course, I'm 100% secure that spring uses if's. But it's proved and used in many strong and reliable apps.

Answer 2

"..for future use if more layouts need to be added"

I'd also suggest you look into the factory pattern. If you contain this conditional logic within a factory, it should help down the line with maintenance and readability.

Answer 3

Since java doesn't have first class functions, you can use interfaces to wrap around.

LayoutHandler ~> Interface

LayoutHandlerA, LayoutHandlerB, etc implements LayoutHandler

Map<String, LayoutHandler> handlers = new HashMap<...>();

LayoutHandler handler = handlers.get(userSelectedLayout);

handler.handle();