Amazon Interview Question Software Engineer Interns
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Wouldn't it be more advantageous to make an interface that is something along the lines of IStorable which describes the methods each object might need to interact with the shelf/other objects? Then the shelf would hold IStorable objects which decouples what type of object can be stored rather than having to inherit from Base.
This seems like a question to check composition and inheritance concepts. Design should be flexible enough to accomodate future changes. Keeping this in mind we can design a base class which will base for any element to be stored on the shelf bringing in inheritence. Shelf is a separate class having fields to identify allowable types that can be stored on the shelf. Shelf class can contain any collections to allow adding and removing objects from it.
- Abh September 07, 2013abstract class Base{
.........
}
class Book extends Base implements PrintedMediumInt{
....................
}
Class DVD extends Base implements ElectronicMedia{
....................
}
class Shelf{
ArrayList <Base> collection;
}
Inheritence is used for object creation and shelf uses composition. In addtion object creation can be done via abstract factory. Further extension for CD/DVD/Blueray can be achieved using decorators.