descendent Comparison Table

Next class: Exception class Up: class Previous class: core class

descendent comparison table

Subject have syntax rule add declare protect is a subtopic of name after access extend provide create using place in represent inherit contain have access mode have example instantiate you implement import from order is a kind of be a descendant of define specify by have access modifier hide have example of creation use override have syntax have benefit be a member of have have part has definition be

subclass
bold = mandatory
italic = non-terminal
normal font = optional
0 or more methods to the methods it inherits from its superclass a list of variables, called instance variables, corresponding to data that will be present in each instance its members from access by other classes or objects using an access modifier Classes the internals of a computer system such as 'Record', 'Table', 'Data', 'Structure', or 'Information' overridden methods using the keyword super
subclass must override any method that is declared abstract in the superclass
or the subclass must be declared abstract
only one superclass implementation for all its instance methods unless the class is abstract the extends keyword its own source file several similar objects none, some or all of its state from all its ancestors data associated with each object
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
create an instance of it more than one interface a package elements as follows:
class variables
instance variables
constructors
the most important public methods
methods that are simply used to access variables
private methods
descendent Object class until its direct superclass has been defined 1 class definition
public
or private
or protected
an inherited member variable by declaring a member variable with the same name
public class Movie extends Attraction
any member that is inherited any method that is declared final in the superclass
class classname
{ // declarations of variables
// declarations of constructors
// declarations of other methods with public ones first
}
reusability
modularity
1 named package rather than the default package a unique name since somebody in the future might want to import the packages containing both classes and hence create a name clash constructor A class that is an extension of another class, and hence inherits from the other class the unit of data abstraction in an object-oriented program

Next class: Exception class Up: class Previous class: core class

Subject	have syntax rule	add	declare	protect	is a subtopic of	name after	access		extend	provide	create using	place in	represent	inherit	contain	have access mode	have example	instantiate you	implement	import from	order	is a kind of	be a descendant of	define	specify by	have access modifier	hide	have example of creation	use	override	have syntax	have benefit	be a member of	have	have part	has definition	be
subclass	bold = mandatory italic = non-terminal normal font = optional	0 or more methods to the methods it inherits from its superclass	a list of variables, called instance variables, corresponding to data that will be present in each instance	its members from access by other classes or objects using an access modifier	Classes	the internals of a computer system such as 'Record', 'Table', 'Data', 'Structure', or 'Information'	overridden methods using the keyword super	subclass must override any method that is declared abstract in the superclass or the subclass must be declared abstract	only one superclass	implementation for all its instance methods unless the class is abstract	the extends keyword	its own source file	several similar objects	none, some or all of its state from all its ancestors	data associated with each object		public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } }	create an instance of it	more than one interface	a package	elements as follows: class variables instance variables constructors the most important public methods methods that are simply used to access variables private methods	descendent	Object class	until its direct superclass has been defined	1 class definition	public or private or protected	an inherited member variable by declaring a member variable with the same name	public class Movie extends Attraction	any member that is inherited	any method that is declared final in the superclass	class classname { // declarations of variables // declarations of constructors // declarations of other methods with public ones first }	reusability modularity	1 named package rather than the default package	a unique name since somebody in the future might want to import the packages containing both classes and hence create a name clash	constructor	A class that is an extension of another class, and hence inherits from the other class	the unit of data abstraction in an object-oriented program