member Comparison Table

member

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member comparison table

Subject have syntax rule destroy in add declare protect is a subtopic of name after access declare by create refer to access by extend has part provide place in represent inherit return to contain use by have purpose is a synonym of have access level pass as have example instantiate you implement import from have scope be part of belong to order is a kind of initialize by be a descendant of define specify by have access modifier be accessible to hide declare anywhere in use override have syntax have benefit be a member of have have part return has definition be is partitioned into

class member Members every method of the class static member member A member of a class which is either a field or a method class method, class variable

inner class
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' any public class in other packages
if a class is not declared public
then it is accessible only to members of the same package
only one superclass implementation for all its instance methods unless the class is abstract its own source file several similar objects behaviour from its superclass data associated with each object private or protected
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
nested class Object class a class type whose instances are the values of the class type 1 class definition private or protected an implements clause to declare that it contains methods for each of the operations specified by the interface methods that are inherited from the class's 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 nested class whose instance exists within an instance of its enclosing class and has direct access to the instance members of its enclosing instance static or not

instance member Members member instance method, instance variable

member variable
bold = mandatory
italic = non-terminal
normal font = optional
the block where it is declared giving the data type followed by the name of the variable a class or an object or a primitive datum other variables and methods in any class in the same package by default value only values that are of the same type as the variable or a subtype of the variable's type to refer to an object or a class or a primitive datum field variable an assignment statement
public
or private
or protected
the code in its class a class outside of a method a class or an object comment if it is non-obvious as private as possible class variable, instance variable

method
bold = mandatory
italic = non-terminal
normal font = optional
Methods all instance variables of all objects of its class an object by instantiating a class other methods and variables in any class in the same package by default
when a method is called
and the method's parameter is a primitive type
then the memory allocated for that parameter holds a copy of the parameter itself
a block of implementation code its caller from only one place which should be the last statement return statement unless it has a void return type member function an argument to a method or constructor
the behaviour of an object
or the behaviour of a class
a class or an object a class specification its return type
public
or private
or protected
instance variables, class variables from other objects the super method to invoke a method declared in the superclass a method in a superclass with the same name a comment at its head if the method is non-obvious method signature a value that is of the return type of the method or a subtype of that type Code that specifies some of the behaviour of a class or instance public except for those that will definitely need to be called from outside the package static method, instance method

Next kbTop: member of a package Up: kbTop Previous kbTop: mechanism

Subject	have syntax rule	destroy in	add	declare	protect	is a subtopic of	name after	access	declare by	create	refer to	access by		extend	has part	provide	place in	represent	inherit	return to	contain	use by	have purpose	is a synonym of	have access level	pass as	have example	instantiate you	implement	import from	have scope	be part of	belong to	order	is a kind of	initialize by	be a descendant of	define	specify by	have access modifier	be accessible to	hide	declare anywhere in	use	override	have syntax	have benefit	be a member of	have	have part	return	has definition	be	is partitioned into
class member						Members																every method of the class		static member											member																	A member of a class which is either a field or a method		class method, class variable
inner class	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'	any public class in other packages					if a class is not declared public then it is accessible only to members of the same package	only one superclass		implementation for all its instance methods unless the class is abstract	its own source file	several similar objects	behaviour from its superclass		data associated with each object				private or protected		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	nested class		Object class	a class type whose instances are the values of the class type	1 class definition	private or protected				an implements clause to declare that it contains methods for each of the operations specified by the interface	methods that are inherited from the class's 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 nested class whose instance exists within an instance of its enclosing class and has direct access to the instance members of its enclosing instance	static or not
instance member						Members																													member																			instance method, instance variable
member variable	bold = mandatory italic = non-terminal normal font = optional	the block where it is declared							giving the data type followed by the name of the variable		a class or an object or a primitive datum	other variables and methods in any class in the same package by default			value						only values that are of the same type as the variable or a subtype of the variable's type		to refer to an object or a class or a primitive datum	field											variable	an assignment statement				public or private or protected	the code in its class		a class outside of a method					a class or an object	comment if it is non-obvious				as private as possible	class variable, instance variable
method	bold = mandatory italic = non-terminal normal font = optional					Methods		all instance variables of all objects of its class		an object by instantiating a class		other methods and variables in any class in the same package by default	when a method is called and the method's parameter is a primitive type then the memory allocated for that parameter holds a copy of the parameter itself		a block of implementation code					its caller from only one place which should be the last statement	return statement unless it has a void return type			member function		an argument to a method or constructor			the behaviour of an object or the behaviour of a class			a class or an object	a class		specification			its return type		public or private or protected		instance variables, class variables from other objects		the super method to invoke a method declared in the superclass	a method in a superclass with the same name				a comment at its head if the method is non-obvious	method signature	a value that is of the return type of the method or a subtype of that type	Code that specifies some of the behaviour of a class or instance	public except for those that will definitely need to be called from outside the package	static method, instance method