Factory in Java when concrete objects take different constructor parameters

Question

I\'m trying to implement a Factory pattern in Java. I have a class called Shape which Circle and Triangle extends. The problem is that Shape constructor gets only 2 parameters w

Answer 1

All of your implementations must take the same number of arguments, you have three options:

• have the factory store the addition arguments so you only need to provide the centre for example.
• have the factory take all arguments even though some factories might ignore some of them.
• have an argument be variable length. e.g. 'double...' the problem with this is the caller needs to know what the factory needs which defeats the purpose of a factory. IMHO.