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Abstract and Interface
Abstract Class: An abstract class is a class that is declared abstract — it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. An abstract class may have static fields and static methods. When an abstract class is subclassed, the subclass usually provides implementations for all of… Continue reading
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Little Mary in sunday school
Little Mary was not the best student in Sunday School. Usually she slept through the class. One day the teacher called on her while she was napping, ”Tell me, Mary, who created the universe?” When Mary didn’t stir, little Johnny, an altruistic boy seated in the chair behind her, took a pin and jabbed her… Continue reading