Question 1

Non-abstract classes are called ________.

Accepted Answer

A) real classes. 
B) instance classes. 
C) implementable classes. 
D) concrete classes. 
A) real classes. 
B) instance classes. 
C) implementable classes. 
D) concrete classes.

Question 2

Declaring a method final means:

Accepted Answer

A) it will prepare the object for garbage collection. 
B) it cannot be accessed from outside its class. 
C) it cannot be overloaded. 
D) it cannot be overridden. 
A) it will prepare the object for garbage collection. 
B) it cannot be accessed from outside its class. 
C) it cannot be overloaded. 
D) it cannot be overridden.

Question 3

Which of the following could be used to declare abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments)?

Accepted Answer

A) public int method1(); 
B) public int abstract method1(); 
C) public abstract int method1(); 
D) public int nonfinal method1(); 
A) public int method1(); 
B) public int abstract method1(); 
C) public abstract int method1(); 
D) public int nonfinal method1();

Question 4

Polymorphism enables you to:

Accepted Answer

A) program in the general. 
B) program in the specific. 
C) absorb attributes and behavior from previous classes. 
D) hide information from the user. 
A) program in the general. 
B) program in the specific. 
C) absorb attributes and behavior from previous classes. 
D) hide information from the user.

Question 5

Which keyword is used to specify that a class will define the methods of an interface?

Accepted Answer

A) uses 
B) implements 
C) defines 
D) extends 
A) uses 
B) implements 
C) defines 
D) extends

Question 6

Classes and methods are declared final for all but the following reasons:

Accepted Answer

A) final methods allow inlining the code. 
B) final methods and classes prevent further inheritance. 
C) final methods are static. 
D) final methods can improve performance. 
A) final methods allow inlining the code. 
B) final methods and classes prevent further inheritance. 
C) final methods are static. 
D) final methods can improve performance.

Question 7

It is a UML convention to denote the name of an abstract class in ________.

Accepted Answer

A) bold. 
B) italics. 
C) a diamond. 
D) there is no convention of the UML to denote abstract classes-they are listed just as any other class. 
A) bold. 
B) italics. 
C) a diamond. 
D) there is no convention of the UML to denote abstract classes-they are listed just as any other class.

Question 8

Which of the following statements is false?

Accepted Answer

A) An advantage of inheritance over interfaces is that only inheritance provides the is-a relationship. 
B) Objects of any subclass of a class that implements an interface can also be thought of as objects of that interface type. 
C) When a method parameter is declared with a subclass or interface type,the method processes the object passed as an argument polymorphically. 
D) All objects have the methods of class Object. 
A) An advantage of inheritance over interfaces is that only inheritance provides the is-a relationship. 
B) Objects of any subclass of a class that implements an interface can also be thought of as objects of that interface type. 
C) When a method parameter is declared with a subclass or interface type,the method processes the object passed as an argument polymorphically. 
D) All objects have the methods of class Object.

Non-abstract classes are called ________.

Declaring a method final means:

Which of the following could be used to declare abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments)?

Polymorphism enables you to:

Which keyword is used to specify that a class will define the methods of an interface?

Classes and methods are declared final for all but the following reasons:

It is a UML convention to denote the name of an abstract class in ________.

Which of the following statements is false?

Introduction to Computers and Java

Introduction to Java Applications

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Exception Handling

Gui Components: Part 1

Graphics and Java 2D

Strings

Files,streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

JavaFX

Filters

Exam 10: Object-Oriented Programming: Polymorphism

Non-abstract classes are called ________.

Declaring a method final means:

Which of the following could be used to declare abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments)?

Polymorphism enables you to:

Which keyword is used to specify that a class will define the methods of an interface?

Classes and methods are declared final for all but the following reasons:

It is a UML convention to denote the name of an abstract class in ________.

Which of the following statements is false?

Introduction to Computers and Java

Introduction to Java Applications

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Exception Handling

Gui Components: Part 1

Graphics and Java 2D

Strings

Files,streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

JavaFX

Filters