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abstract class comparison table

Subject	need in	lack	have	be	is a kind of	store	is a subtopic of	implement	group	hide	create	have purpose	have form	perform	place in	has part	divide up into	use	help	order	name after	represent	extend	declare	draw as	contain	have high cohesion	create by	see also
Java abstract class	a domain model if you have to store or manipulate instances of it in order to implement a requirement	side effects if it does not modify any data, and does not leave behind any information, other than its result, that would have an effect on other computations	one or more abstract methods	abstract if it has one or more abstract methods	Java class	in a file of the same name	The Basics of Java	particular low-level subsystems	the pieces of data that describe some entity, so that programmers can manipulate that data as a unit	the details of data	to hold a responsibility if the responsibility cannot be attributed to any of the existing classes	to hold features that will be inherited by two or more subclasses	class classname { // declarations of variables // declarations of constructors (discussed below) // declarations of other methods with public ones first }	a special-purpose function such as the user interface for a particular system	its own source file	abstract method	methods	an implements clause to declare that it contains methods for each of the operations specified by the interface	a programmer to cope with the complexity of data	elements as follows: class variables instance variables constructors the most important public methods methods that are simply used to access variables private methods	the internals of a computer system such as 'Record', 'Table', 'Data', 'Structure', or 'Information'	several similar objects	only one superclass	a list of variables, called instance variables, corresponding to data that will be present in each instance	a box with the name of the class inside in a UML class diagram	data associated with each object	if related aspects of a system are kept together in this module, and unrelated aspects are kept out	specifying the abstract keyword on the first line when you declare the class	class^2

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