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abstract method
subject			fact

abstract method	has purpose to serve as a placeholder, indicating that subclasses must have concrete implementations
	is a subtopic of The Basics of Java
	is a kind of method
method	is equivalent to the terms "function member" or "member function" which are used in C++
	is equivalent to the terms "routine", "function" or "procedure" which are used in non object oriented languages
	should have a comment at its head if the method is non-obvious
procedural abstraction	has advantage when using a certain procedure, a programmer does not need to worry about all the details of how it performs its computations; he or she only needs to know how to call it and what it computes
	hides the details of procedures
procedure	provides procedural abstraction

Kinds of abstract method :

• Java abstract method (5 facts)