In Java, why might you create a subclass that extends a class?

To build a specialized version of the class with extended capabilities

To remove all methods from the superclass

To convert the class into an interface

In Java, extending a class primarily serves to:

Create a specialized class that inherits and possibly adds features

Reduce its visibility to private

Given the statement: public class FinalExam extends GradedActivity, what is the relationship between FinalExam and GradedActivity?

FinalExam is a subclass of GradedActivity

FinalExam is a superclass of GradedActivity

FinalExam and GradedActivity are unrelated

GradedActivity is a subclass of FinalExam

A constructor for FinalExam is shown as public FinalExam(int questions, int missed). What is the most likely purpose of this constructor based on the class fields?

To set numQuestions and numMissed, and compute pointsEach

To initialize score in GradedActivity

To create an empty FinalExam with default values

Strategic reasoning: If FinalExam extends GradedActivity, how can FinalExam compute and store the overall score for the exam so that getGrade() from GradedActivity works? Choose the best approach based on the provided members.

Call setScore(double) from FinalExam after computing the score so GradedActivity's getGrade() can use it

Override getGrade() in FinalExam and ignore GradedActivity

Make score public and set it directly in FinalExam

Use getNumMissed() to replace score

Which statement best describes private members of a superclass in relation to a subclass?

They are not inherited but still exist in memory when a subclass object is created.

They are inherited and directly accessible in the subclass.

They are inherited but only accessible through protected methods.

They are removed when a subclass object is created.

In an object-oriented system, how can a subclass access a private member of its superclass?

By using public methods of the superclass that expose the private member.

By declaring the member as private again in the subclass.

By referencing the member directly with super.privateMember.

It cannot be accessed in any way.

Which statement is true about public members of a superclass?

They are inherited and may be directly accessed from the subclass.

They are not inherited by the subclass.

They are inherited but cannot be accessed directly.

They exist only when the superclass object is created, not the subclass.

A subclass object is created. What happens to the superclass's private members according to the rules provided?

They exist in memory but are not inherited and require public methods for access.

They do not exist in memory for the subclass object.

They are promoted to public members in the subclass.

They become protected members automatically.

A FinalExam object needs to expose how many questions were missed and the points per question. Which pair of methods from the UML diagram should be used?

getPointsEach() and getNumMissed()

Which statement best describes constructor behavior in inheritance?

Constructors are not inherited.

Constructors are inherited by subclasses.

Only parameterized constructors are inherited.

Constructors are inherited only if marked public.

When a subclass object is created, which constructor executes first by default if available?

Superclass default (no-arg) constructor

Any parameterized constructor in subclass

The most recently defined constructor

If the superclass defines only a parameterized constructor and no default constructor, what must subclasses do?

Provide a constructor and call a superclass constructor

Provide no constructors and rely on inheritance

Use this() to skip superclass initialization

Declare the subclass as abstract to avoid constructors

Which statement about calling a superclass constructor in a subclass is correct?

It must be the first Java statement in the subclass constructor.

It can appear anywhere in the subclass constructor.

It must be the last Java statement in the subclass constructor.

It is optional when a default constructor exists in the superclass.

In the presence of a parameterized constructor in the superclass, which additional option allows subclasses to avoid explicitly calling super(...)?

Superclass provides a no-arg constructor

Subclass provides a static method

Subclass marks its constructor private

What is the primary purpose of using super(...) within a subclass constructor?

To initialize the superclass part of the object

To call another constructor in the same class

To import methods from the superclass

Choose the correct execution order when both superclass and subclass define constructors and the subclass calls super(...).

Superclass constructor executes first, then subclass constructor body.

Subclass constructor body executes, then superclass constructor.

Order is undefined and depends on the JVM.

A subclass has no constructor defined. The superclass has a public no-arg constructor. What happens on instantiation of the subclass?

Superclass constructor is automatically called first

Compilation error due to missing subclass constructor

Subclass constructor is synthesized and runs before the superclass

Which rule applies when designing subclass constructors if the superclass provides only parameterized constructors?

Subclasses must define a constructor and call a superclass constructor using super(...)

Subclasses may omit constructors; the compiler will add a default that calls super()

Subclasses must define a default constructor only

Subclasses cannot be instantiated

Which constructor executes first in a class inheritance hierarchy when creating a subclass object?

The most recently defined constructor

The constructor with the most parameters

In Java, where are you allowed to write a super statement that calls a superclass constructor?

Only in the subclass’s constructor

In static initialization blocks

If a super statement appears in a subclass constructor, what is its required position?

It can be anywhere after variable declarations

It must follow a call to this()

What happens if a subclass constructor does not explicitly call a superclass constructor in Java?

Java automatically calls super() before the subclass constructor code executes

The subclass constructor runs without any superclass constructor

A superclass lacks both a default constructor and a no-arg constructor. What must a subclass that inherits from it do?

Explicitly call one of the existing constructors that the superclass does have

Nothing; Java inserts a default constructor for the superclass

Declare a no-arg constructor in the subclass

Use this() to avoid calling the superclass

Which statement best describes the rule about calling a superclass constructor from methods other than the subclass constructor?

It is not allowed; the superclass constructor cannot be called from any other method

It is allowed using super anywhere

It is allowed only in static methods

It is allowed if the method is private

Consider a subclass constructor that begins with some logging statements and then calls super(). Which outcome aligns with Java’s constructor rules?

Fails to compile because super() must be the first statement

Compiles and runs; order of statements is flexible

Compiles but throws an exception at runtime

Runs but ignores the logging statements

Which statement best explains why a subclass might override a superclass method?

Because the subclass is more specialized and may need a more suitable method

To ensure the superclass method is always called first

To change the method name for readability

What happens when an object of the subclass invokes an overridden method?

The subclass’s version is executed

The superclass’s version is executed

Both versions execute sequentially

Which phrase from the material defines method overriding?

A subclass may have a method with the same signature as a superclass method

A subclass defines additional methods

A superclass calls a subclass method

Select the true statement about overriding from the material.

Overriding uses the same signature as the superclass method

Overriding requires changing the parameter list

Overriding is possible only if the subclass removes the method from the superclass

Overriding always changes the return type

Why might a subclass replace an inadequate superclass method?

To provide a more suitable implementation for the specialized subclass

To prevent objects from invoking methods

To force compilation-time binding

Which pair correctly matches method name and return type shown for GradedActivity?

CurvedActivity(percent: double): void

In the CurvedActivity class, which member listed is a constructor?

CurvedActivity(percent: double)

Which statement correctly distinguishes overloading from overriding?

Overloading uses different signatures for methods with the same name; overriding uses the same signature

Overloading requires the same signature; overriding requires different signatures

Overloading happens only across classes; overriding happens only within a class

Overloading and overriding are identical concepts

When a method overrides another method, how do their signatures compare?

They can be either the same or different

ITC C209 Final Term Quiz 1

Authored by Dr. Celestial-Valderama

Information Technology (IT)

University

Used 2+ times

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75 questions

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MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which statement best reflects the concept of inheritance introduced in this section?

Specialized objects are unrelated to general objects.

Specialized objects are versions of more general objects found in the real world.

General objects are always more complex than specialized objects.

Inheritance only applies to physical size differences.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which option correctly pairs a specialized object with its more general object according to the concept of inheritance?

Bee → Animal

Grasshopper → Insect

Dalmatian → Mammal

Chihuahua → Reptile

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Consider the labeled grasshopper diagram. Which reasoning best explains how inheritance helps organize its features?

Inheritance lists every body part of any organism.

Inheritance lets the grasshopper inherit common insect traits (head, thorax, abdomen, wings) while adding its own specifics.

Inheritance removes differences between insects.

Inheritance applies only to mammals, not insects.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which statement best defines the "Is a" relationship in inheritance?

A relationship where two objects share no characteristics

A relationship indicating one object is a specialized version of another

A relationship where objects are unrelated but interact

A relationship that only applies to methods, not classes

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Select the example that illustrates an "Is a" relationship.

A car has wheels

A Great Dane is a dog

A flower needs sunlight

An insect eats plants

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

In an "Is a" relationship, what does the specialized object inherit from the general object?

Only its name

All characteristics of the general object

None of its characteristics

Only private data fields

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which statement correctly applies the concept to Java?

Inheritance in Java creates a "has a" relationship among classes

Inheritance in Java is used only for code duplication

Inheritance in Java can create an "is a" relationship among classes

Inheritance in Java cannot extend class capabilities

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ITC C209 Final Term Quiz 1

Which statement best reflects the concept of inheritance introduced in this section?

Which option correctly pairs a specialized object with its more general object according to the concept of inheritance?

Consider the labeled grasshopper diagram. Which reasoning best explains how inheritance helps organize its features?

Which statement best defines the "Is a" relationship in inheritance?

Select the example that illustrates an "Is a" relationship.

In an "Is a" relationship, what does the specialized object inherit from the general object?

Which statement correctly applies the concept to Java?

In Java, why might you create a subclass that extends a class?

In Java, extending a class primarily serves to:

In Java, which keyword is used in the class header to indicate that one class is a subclass of another?

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