002 - Object-Oriented Programming Concepts

Question 1

A software object’s state is stored in ___.

Answer 1

Class fields

Question 2

software object’s behavior is exposed through ___.

Answer 2

Methods

Question 3

Hiding internal data from the outside world, and accessing it only through publicly exposed methods is known as data ___.

Answer 3

Encapsulation

Question 4

A blueprint for a software object is called a ___.

Answer 4

Class

Question 5

Common behavior can be defined in a ___ and inherited into a ___ using the ___ keyword.

Answer 5

Superclass 
Subclass 
Extends

Question 6

A collection of methods with no implementation is called an ___.

Answer 6

Interface

Question 7

A namespace that organizes classes and interfaces by functionality is called a ___.

Answer 7

Package

Question 8

The term API stands for ___?

Answer 8

Application programming interface

Question 9

Real-world objects contain ___ and ___.

Answer 9

States and behaviors

Question 10

______ is a software bundle of related state and behavior.

Answer 10

An object

Question 11

__________ are often used to model the real-world objects that you find in everyday life

Answer 11

Software objects

Question 12

_______ is a blueprint or prototype from which objects are created

Answer 12

A class

Question 13

__________ is a contract between a class and the outside world.

Answer 13

An interface

Question 14

_______ is a namespace for organizing classes and interfaces in a logical manner.

Answer 14

A package

Question 15

Placing your code into ________ makes large software projects easier to manage.

Answer 15

packages

Question 16

________ operate on an object’s internal state and serve as the primary mechanism for object-to-object communication.

Answer 16

Methods

Question 17

The source code for an object can be written and maintained independently of the source code for other objects.

Answer 17

Modularity

Question 18

By interacting only with an object’s methods, the details of its internal implementation remain hidden from the outside world.

Answer 18

Information-hiding

Question 19

If an object already exists (perhaps written by another software developer), you can use that object in your program.

Answer 19

Code re-use

Question 20

If a particular object turns out to be problematic, you can simply remove it from your application and plug in a different object as its replacement

Answer 20

Pluggability and debugging ease

Question 21

your bicycle is an ______ of the ____of ____known as bicycles

Answer 21

your bicycle is an instance of the class of objects known as bicycles

Question 22

Object-oriented programming allows classes to ______ commonly used state and behavior from other classes.

Answer 22

inherit

Question 23

each class is allowed to have one direct ________, and each ________has the potential for an unlimited number of ________:

Answer 23

each class is allowed to have one direct superclass, and each superclass has the potential for an unlimited number of subclasses:

Question 24

to inherit from a class, we use the keyword

Answer 24

extends

Question 25

____________ is a group of related methods with empty bodies

Answer 25

an interface

Question 26

to declare the use of an interface, we use the keyword

Answer 26

implements

Question 27

When is the interface contract forced?

Answer 27

At compile time

Question 28

The _____________________ contains the complete listing for all packages, interfaces, classes, fields, and methods supplied by the Java SE platform.

Answer 28

Java Platform API Specification