programming methodology -defines objects whose behaviors and interactions accomplish a given task

has characteristics or attributes -value of object attributes give object states -behaviors:actions -method:behavior, piece of java

organizing classes -take on properties of objects from another class -avoid repetition -apply inheritance-'extends'

program component that contains the heading -describe all the public methods-other specify certain methods -'implements'

collections of related classes and interfaces -use all classes with program or class 'import'

methods is not used to return a value

list of variables in a method declaration

actual value

declared outside the method

collection of statements that grouped together to perform oepration -'this'

declared within a method definition

restricting access

-no restriction -invoke anywhere

-name cannot be used to access it outside class definition -cannot be invoked

public method returns data from a private instance variable -getter

-changes the data stored in private instance variable -setter

process of combining data and actions into a single item -groups instnc vrbls and mthds into a class -hides implementation details

enables existing class to define new class -subclass, child class, descendant class

-existing class that the derived class is built upon -superclass, parent class, ancestor class

ability of an object to take many forms

-used to specify methods that a class must implement -contains headings

keyword for package

keyword for interface

keyword for inheritancd

is a special method that is used to create and initialize an object

is shared by all the objects of its class

is a mrthod that can be invoked without using any subject

occurs when multiple methods have the same name within the same class

desribes the structure of a class by displaying the class name

methods name and the number and types of its paraneters are called

allow many meaning to be associated to one method name