Internet Computing - Quiz 1

False

To program in Java we must have an IDE (true/false)

compiled, interpreted

Java program is \____ and \____ to native machine code

attributes, methods

In the context of Object oriented programming, classes have \____ and \_____

false

Objects are templates for Classes (true/false)

true

Objects are instances of classes and objects have an identity (true/false)

Writing, compilation, interpretation, execution

Steps for running a java program

true

The file name must match the name of the public class defined in a file (true/false)

Aggregation

If a class has an attribute of which is another class, the relationship is called:

implements

\____ is the keyword used to connect classes and interfaces

Private, Protected, "Default", Public

The order of access modifiers from most restrictive to not restrictive

Encapsulation

Interfaces are provided for clients to access a component. Interfaces ensure a proper \____ of the component

allows

List \______ duplicate entries

does not allow

Set \____ duplicates

final

\_____ is the keyword if you do not want a class to be inherited by others

Packages

\______ are used to organize related classes

"has a"

Aggregation in OOAD defines \____ relationship between 2 classes

"is a"

Inheritance in OOAD defines \____ relationship between 2 classes

true

A superclass implements an interface in Java (true/false)

super()

Keyword to invoke the constructor of the superclass

Overriding

\______ is termed as creating a new method with the same signature as a method in the superclass

Use case diagram

To describe the interactions between actors and use cases in a system

Association

Which type of relationship in a use case diagram indicates that an actor is involved in a use case?

Arrays

Not a part of the Java collection framework

Inheritance

The method to create hierarchy between classes by inheriting other classes

Abstract classes

base class used to provide common interface/behavior for its subclasses; cannot be instantiated

Abstract methods

Methods declared in an abstract class do not have any implement; signature of a method

extends

Keyword to implement inheritance

Public

Accessible to everyone

Default

Protected access; only access to classes in a current package

Protected

Can only be accessed within the class or classes that are inheriting from classes

Private

Can only be accessed within the class

Constructors

Methods used to initiate a class and its attribute

Static

Creates one copy for the entire scope (class)

Final

Prohibits overriding of method and extensions of classes

Interfaces

A collection of abstract methods and static final variables that defines a set of behaviors for a class to implement;

Interfaces

Utilized in polymorphism to set up methods to be overridden later with actual class instantiations

Polymorphism

Allows objects of different classes to be treated as if they were objects within the same class

Overloading

Same method name, different parameters

Overriding

Same method but subclass overwrites superclass's method

List

Prioritizes the order of elements, contains null and duplicates

Sets

Order does not matter and can only have unique values

Sets

Allows a null

Maps

key-value pairs, keys cannot be duplicates but values can