Question 1

An advantage to making a method ____________________ is that the compiler knows there will be only one version of the method.

Accepted Answer

The answer of An advantage to making a method ____________________...

Question 2

Usually, the subclass constructor only needs to initialize the ____ that are specific to the subclass.
A) objects
B) data fields
C) methods
D) constructors

Accepted Answer

The data fields of the subclass are the ones that are specific to the subclass since they are not inherited from the superclass. Therefore, it is only necessary to initialize these data fields in the subclass constructor.

Question 3

Which statement correctly declares a sedan object of the Car class?
A) sedan Car = new sedan();
B) sedan Car  = new sedan();
C) Car sedan = new Car();
D) new sedan() = Student;

Accepted Answer

The correct syntax for declaring an object of a class is to use the class name followed by the object name, and then use the "new" keyword to instantiate the object with the class constructor. In this case, the class is Car and the object name is sedan, so the correct syntax is "Car sedan = new Car();"

Question 4

You can use the ____ modifier with methods when you don't want the method to be overridden.
A) override
B) access
C) final
D) end

Accepted Answer

The final modifier is used to indicate that a method cannot be overridden by any subclasses. This is useful when you want to ensure that a specific implementation of a method will always be used, regardless of any subclasses that may be created.

Question 5

In most Java classes, the keyword private precedes each data field, and the keyword ____________________ precedes each method.

Accepted Answer

The answer of In most Java classes, the keyword private...

Question 6

When you create parent and child classes of your own, the child classes use ____ constructors.
A) two
B) three
C) four
D) six

Accepted Answer

The answer of When you create parent and child classes...

Question 7

When you employ ____, your data can be altered only by the methods you choose and only in ways that you can control.
A) virtual method calls
B) polymorphism
C) information hiding
D) inlining

Accepted Answer

Information hiding is a programming concept that allows specific information to be hidden from the user and only accessed through methods that are explicitly provided. This means that your data can only be altered in ways that you have defined in your program, which gives you more control and helps prevent unintentional changes or errors in your code. Virtual method calls, polymorphism, and inlining are all related but do not necessarily provide the same level of control over data manipulation.

Question 8

Using the keyword ____ provides you with an intermediate level of security between public and private access.
A) protected
B) this
C) super
D) secure

Accepted Answer

The keyword "protected" in object-oriented programming languages is used to denote member variables and methods that are accessible within the same class and its subclasses, but not outside of them. This provides an intermediate level of security that is not as restrictive as private access but not as open as public access. Therefore, choice A is the best answer.

Question 9

If jrStudent is an object of Student, which of the following statements will result in a value of true?
A) Student = instanceof jrStudent
B) jrStudent instanceof Student
C) instanceof Student = jrStudent
D) Student instanceof jrStudent

Accepted Answer

The correct syntax for the instanceof operator is "object instanceof Class". Therefore, the only statement that correctly checks if jrStudent is an instance of the Student class is "jrStudent instanceof Student". This will result in a value of true if jrStudent is indeed an object of the Student class.

Question 10

Within a subclass, you can think of the keyword ____ as the opposite of super.
A) sub
B) this
C) protected
D) not

Accepted Answer

The keyword "this" refers to the current object that the method or constructor is being called on, while "super" refers to the parent class of the current class. "this" is often used to differentiate between instance variables and local variables within a method or constructor, while "super" is used to call a method or constructor from the parent class. Therefore, "this" can be thought of as the opposite of "super" within a subclass.

Question 11

The classes you create in ____________________ programming languages can inherit data and methods from existing classes.

Accepted Answer

The answer of The classes you create in ____________________ programming...

Question 12

Which of the following statements depicts the valid format to call a superclass constructor from a subclass constructor?
A) superclass(name, score);
B) subclass(name, score);
C) extends(name, score);
D) super(name, score);

Accepted Answer

In order to call a superclass constructor from a subclass constructor, we need to use the "super" keyword followed by the arguments passed to the superclass constructor. Therefore, option D - super(name, score); - is the correct format.

Question 13

Which of the following statements will create a class named Red that is based on the class Color?
A) public class Red extends Color
B) public Red class extends Color
C) public Color class expands Red
D) public extend Red class Color

Accepted Answer

The correct syntax for creating a class that extends another class is "public class Subclass extends Superclass". Choice A follows this syntax and creates a subclass named Red that extends the superclass Color. Choice B is incorrect syntax, and choices C and D use incorrect keywords and order.

Question 14

The methods in a subclass can use all of the data fields and methods that belong to its parent, with one exception: ____ members of the parent class are not accessible within a child class's methods.
A) private
B) public
C) final
D) protected

Accepted Answer

Private members of the parent class are not accessible within a child class's methods, whereas all other types of members (public, final, and protected) are accessible.

Question 15

The term ____________________ means "many forms."

Accepted Answer

The answer of The term ____________________ means "many forms."...

Question 16

When you create a class and do not provide a(n) ____, Java automatically supplies you with a default one.
A) constructor
B) argument
C) header
D) name

Accepted Answer

When a class is created and no constructor is defined, Java will automatically provide a default constructor.

Question 17

If a ____ method has the same name as a parent class method and you use the name with a child class object, the child method hides the original.
A) final
B) static
C) protected
D) private

Accepted Answer

When a static method in a child class has the same name as a static method in a parent class, it is known as method hiding. This is because static methods are associated with the class, not instances of the class.

Question 18

You are never aware that ____ is taking place; the compiler chooses to use this procedure to save the overhead of calling a method.
A) information hiding
B) polymorphism
C) overriding
D) inlining

Accepted Answer

The given statement refers to the process of inlining, where the compiler replaces the function call with the actual code to save the overhead of calling a method. The other options - information hiding, polymorphism, and overriding - are not relevant in this context.

Question 19

You would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?
A) private or protected
B) private
C) protected
D) public

Accepted Answer

The answer of You would like to make a member...

Question 20

Programmers and analysts sometimes use a graphical language to describe classes and object-oriented processes. This language is called ___________________________________.

Accepted Answer

The answer of Programmers and analysts sometimes use a graphical...

Quiz 10: Introduction to Inheritance

An advantage to making a method ____________________ is that the compiler knows there will be only one version of the method.

Usually, the subclass constructor only needs to initialize the ____ that are specific to the subclass.

Which statement correctly declares a sedan object of the Car class?

You can use the ____ modifier with methods when you don't want the method to be overridden.

In most Java classes, the keyword private precedes each data field, and the keyword ____________________ precedes each method.

When you create parent and child classes of your own, the child classes use ____ constructors.

When you employ ____, your data can be altered only by the methods you choose and only in ways that you can control.

Using the keyword ____ provides you with an intermediate level of security between public and private access.

If jrStudent is an object of Student, which of the following statements will result in a value of true?

Within a subclass, you can think of the keyword ____ as the opposite of super.

The classes you create in ____________________ programming languages can inherit data and methods from existing classes.

Which of the following statements depicts the valid format to call a superclass constructor from a subclass constructor?

Which of the following statements will create a class named Red that is based on the class Color?

The methods in a subclass can use all of the data fields and methods that belong to its parent, with one exception: ____ members of the parent class are not accessible within a child class's methods.

The term ____________________ means "many forms."

When you create a class and do not provide a(n) ____, Java automatically supplies you with a default one.

If a ____ method has the same name as a parent class method and you use the name with a child class object, the child method hides the original.

You are never aware that ____ is taking place; the compiler chooses to use this procedure to save the overhead of calling a method.

You would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?

Programmers and analysts sometimes use a graphical language to describe classes and object-oriented processes. This language is called ___________________________________.