Class or Interface

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Tutorial: Class or Interface

Declare variables as class or interface type?

Tutorial Details:

A common programming philosophy is to declare variables with a type that makes the least assumptions. This allows flexibility to make changes in the underlying type if this latter becomes necessary. For example, the most obvious way to declare x is

ArrayList x = new ArrayList();

Why change the underlying class?
The two List classes, ArrayList and LinkedList both implement the same List interface methods and can be manipulated by the methods in the Collections class, but the performance of different operations may be very different, eg, insertion in the middle of an LinkedList is more efficient, but accessing a random element is more efficient using a ArrayList. If it becomes necessary to change the underyling class for performance reasons, it is easy to do if variables are declared by their interfaces (List, Map, and Set for the Collections classes).

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