Question 1

How is the Object class equals() method implemented?

Accepted Answer

The Object class equals() method returns

Question 2

Which of the following is NOT true regarding abstract methods?

Accepted Answer

A)  Abstract methods must be implemented in child classes. 
B)  Abstract methods have no body. 
C)  Abstract methods use the abstract keyword in declarations. 
D)  Abstract methods are inherited by their children. 
A)  Abstract methods must be implemented in child classes. 
B)  Abstract methods have no body. 
C)  Abstract methods use the abstract keyword in declarations. 
D)  Abstract methods are inherited by their children.

Question 3

The  Object  class  equals() method returns a boolean value indicating whether the objects are equal. This  equals() method considers two objects to be equal only if they have the same ____.

Accepted Answer

A)  address 
B)  value 
C)  hash code 
D)  number of characters 
A)  address 
B)  value 
C)  hash code 
D)  number of characters

Question 4

What is an abstract class? Give an example and explain how it works.

Accepted Answer

Sometimes, a parent class is so general

Question 5

The ____ method is useful in debugging a program because it can be used to display and examine values.

Accepted Answer

A)  finalize() 
B)  toString() 
C)  notify() 
D)  equals() 
A)  finalize() 
B)  toString() 
C)  notify() 
D)  equals()

Question 6

It is common to create an interface when you want a class to implement behavior from more than one parent.

Accepted Answer

A) True 
 B)False

Question 7

Give an example of how you can create an interface to have a class implement behavior from more than one parent.

Accepted Answer

Suppose that you want to create an inter

Question 8

If you attempt to instantiate an object from an abstract class, you receive an error message from the compiler that you have committed a(n) ____.

Accepted Answer

A)  LogicError 
B)  InstantiationError 
C)  SyntaxError 
D)  ObjectError 
A)  LogicError 
B)  InstantiationError 
C)  SyntaxError 
D)  ObjectError

Question 9

Match between columns
                        Premises: An alternative to multiple inheritance available in Java

Accepted Answer

The Answer of hash code and interface and functional interface is...

Question 10

public abstract class Shape 
{ 
    private int length; 
    private int width; 
    private int height; 
    ----Code here---- 
} 
Using the above code, create the statement in the place indicated that will create an abstract calculateArea() method in the abstract Shape class.

Accepted Answer

public abs

Question 11

Match between columns
                        Premises: A method that is inherited

Accepted Answer

The Answer of concrete class and java.lang and virtual classes is...

Question 12

When you create a number of classes that inherit from each other, as well as multiple interfaces that you want to implement with these classes, you often will find it convenient to place these related classes in a(n) ____.

Accepted Answer

A)  group 
B)  package 
C)  abstract class 
D)  file 
A)  group 
B)  package 
C)  abstract class 
D)  file

Question 13

Match between columns
                        Premises: A class-naming conflict

Accepted Answer

The Answer of multiple inheritance and lambda expression and anonymous is...

Question 14

The code above provides an example of an interface class. Explain the purpose and advantages of creating interfaces that store related constants.

Accepted Answer

The purpose for creating an interface co

Question 15

Describe the two method types programmers of an abstract class can include.

Accepted Answer

* Nonabstract methods, like those you ca

Question 16

Match between columns
                        Premises: Has no name and is defined inside another class

Accepted Answer

The Answer of equals() method and public , static , is...

Question 17

The AnimalReference application shown above contains a generic Animal reference variable into which you can assign concrete Animal objects. Explain how this example uses polymorphism and why it is important.

Accepted Answer

If you create an Animal class and variou

Question 18

An application's ability to select the correct subclass method is known as ____.

Accepted Answer

A)  implementing methods 
B)  dynamic method binding 
C)  implicit casting 
D)  method fixing 
A)  implementing methods 
B)  dynamic method binding 
C)  implicit casting 
D)  method fixing

Question 19

The Object class equals() method returns a(n) ____ value indicating whether the objects are equal.

Accepted Answer

A)  int 
B)  equals 
C)  null 
D)  boolean 
A)  int 
B)  equals 
C)  null 
D)  boolean

Question 20

Classes from which objects can be instantiated are called constant classes.

Accepted Answer

A) True 
 B)False

How is the Object class equals() method implemented?

Which of the following is NOT true regarding abstract methods?

The Object class equals() method returns a boolean value indicating whether the objects are equal. This equals() method considers two objects to be equal only if they have the same ____.

What is an abstract class? Give an example and explain how it works.

The ____ method is useful in debugging a program because it can be used to display and examine values.

It is common to create an interface when you want a class to implement behavior from more than one parent.

Give an example of how you can create an interface to have a class implement behavior from more than one parent.

If you attempt to instantiate an object from an abstract class, you receive an error message from the compiler that you have committed a(n) ____.

public abstract class Shape { private int length; private int width; private int height; ----Code here---- } Using the above code, create the statement in the place indicated that will create an abstract calculateArea() method in the abstract Shape class.

When you create a number of classes that inherit from each other, as well as multiple interfaces that you want to implement with these classes, you often will find it convenient to place these related classes in a(n) ____.

The code above provides an example of an interface class. Explain the purpose and advantages of creating interfaces that store related constants.

Describe the two method types programmers of an abstract class can include.

The AnimalReference application shown above contains a generic Animal reference variable into which you can assign concrete Animal objects. Explain how this example uses polymorphism and why it is important.

An application's ability to select the correct subclass method is known as ____.

The Object class equals() method returns a(n) ____ value indicating whether the objects are equal.

Classes from which objects can be instantiated are called constant classes.

Creating Your First Java Classes

Using Data

Using Methods, Classes and Objects

More Object Concepts

Making Decisions

Looping

Characters, Strings and the Stringbuilder

Arrays

Advanced Array Concepts

Introduction to Inheritance

Exception Handling

File Input and Output

Introduction to Swing Components

Using Javafx and Scene Builder

Filters

Exam 11: Advanced Inheritance Concepts

How is the Object class equals() method implemented?

Which of the following is NOT true regarding abstract methods?

The Object class equals() method returns a boolean value indicating whether the objects are equal. This equals() method considers two objects to be equal only if they have the same ____.

What is an abstract class? Give an example and explain how it works.

The ____ method is useful in debugging a program because it can be used to display and examine values.

It is common to create an interface when you want a class to implement behavior from more than one parent.

Give an example of how you can create an interface to have a class implement behavior from more than one parent.

If you attempt to instantiate an object from an abstract class, you receive an error message from the compiler that you have committed a(n) ____.

public abstract class Shape { private int length; private int width; private int height; ----Code here---- } Using the above code, create the statement in the place indicated that will create an abstract calculateArea() method in the abstract Shape class.

When you create a number of classes that inherit from each other, as well as multiple interfaces that you want to implement with these classes, you often will find it convenient to place these related classes in a(n) ____.

The code above provides an example of an interface class. Explain the purpose and advantages of creating interfaces that store related constants.

Describe the two method types programmers of an abstract class can include.

The AnimalReference application shown above contains a generic Animal reference variable into which you can assign concrete Animal objects. Explain how this example uses polymorphism and why it is important.

An application's ability to select the correct subclass method is known as ____.

The Object class equals() method returns a(n) ____ value indicating whether the objects are equal.

Classes from which objects can be instantiated are called constant classes.

Creating Your First Java Classes

Using Data

Using Methods, Classes and Objects

More Object Concepts

Making Decisions

Looping

Characters, Strings and the Stringbuilder

Arrays

Advanced Array Concepts

Introduction to Inheritance

Exception Handling

File Input and Output

Introduction to Swing Components

Using Javafx and Scene Builder

Filters