IT Java Chapter 7 Test

Garbage Collector

A built-in function of the Java VM that frees memory as objects are no longer needed or referenced

Nested Class

A class within another class

Hierarchy

A structure that categorizes and organizes relationships among ideas, concepts of things with the most general or all-encompassing component at the top and the more specific, or component with the narrowest scope, at the bottom.

Class Method

Can only access class attributes

Overriding Methods

Changing the definition (body) of an inherited method to suit the subclass.

Overloading

Having more than one constructor or method with the same name but different arguments

Dynamic Method Dispatch

The process of selecting which implementation of a polymorphic operation (method or function) to call at run time.

What does UML stand for?

Unified Modeling Language

Default Constructor

a constructor with no parameters

Mutator Method

a method that changes the state of an object

Method

a procedure or function that is encapsulated as part of a class

UML

a software modeling process that enables system developers to create a blueprint showing the overall functionality of the program being engineered

Class

a template for Java objects

Variable Argument Method

a way to call a method with variable number of arguments

Inheritance

allows classes to gain methods and data by extending to another class (Super class)

Initialize

assign a value

Finalizers

called just before an object is removed by the garbage collector

Polymorphism

concept that allows classes to have different behaviors but same structure of its super class

Instantiate

creating a class object

Object

instance of a class

extends

keyword that declares the superclass of the current class

Static Modifier

keyword that makes something without first creating an instance of a variable

this

keyword used to access variables and methods in a class

Reference

name of a variable associated with an object

default

no access modifier, public

Null

object reference that has not been instantiated

new

operator used to create an instance of a class

Public Access Modifiers

permits access from anywhere

Private Access Modifiers

permits access from only inside of the class

Accessor Method

returns information about an object

Constructor

special method that initializes instance variables

Encapsulation

the hiding of implementation details

Access Modifiers

used to specify accessibility of variables, methods, and classes

Static Variable

variable declared with static modifier and there can only be one of the variable