is-a versus has-a principle concept from the Java knowledge base

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is-a versus has-a principle

subject fact

is-a versus has-a principle is a subtopic of Classes 2001-10-19 11:37:02.0
is a subtopic of Inheritance
is a kind of principle
states that if you find yourself using the phrase "an X is a Y" when describing the relation between two classes, then the first class is a subclass of the second; if you find yourself using "X has a Y", then instance of the second class appear as parts of instances of the first class added by: JK, source: On To Java, 2001-10-19 11:37:02.0

is-a versus has-a principle	is a subtopic of Classes
	is a subtopic of Inheritance
	is a kind of principle
	states that if you find yourself using the phrase "an X is a Y" when describing the relation between two classes, then the first class is a subclass of the second; if you find yourself using "X has a Y", then instance of the second class appear as parts of instances of the first class