emotional result we call happiness, most of us tend to engage in behaviour that is the exact opposite and then feel awful and inadequate with the inevitable result.
A subcategory within a particular genre: The academic mystery is a subgenre of the mystery novel. subcategory within a particular genre: The academic mystery is a subgenre of the mystery novel.
A subclass in java, is a class that inherits from another class. Inheritance is a way for classes to add specialized behavior ontop of generalized behavior. This is often represented by the phrase is a relationship.