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Learn Basics – Module 4 Lesson 3 – Quiz

Last updated: November 26, 2025

Written by: komal

Learn Java Basics
Lesson 3: Interfaces
Learn Basics – Module 4 Lesson 3 – Quiz

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Question 1 of 4

1. Question

Which relationship type best describes the connection between a class and an interface?

The "IS-A" relationship (e.g., A Car IS-A Vehicle).
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The "HAS-A" relationship (e.g., A Car HAS-A Engine).
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The "CAN-DO" relationship (e.g., A Task CAN-DO Export).
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The "WAS-A" relationship (e.g., A Butterfly WAS-A Caterpillar).
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Question 2 of 4

2. Question

In Java, a class can extend only one superclass. How many interfaces can a single class implement?

Many (multiple interfaces).
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Up to two.
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Only one.
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None, unless the class is abstract.
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Question 3 of 4

3. Question

If the Task class declares that it implements the Exportable interface, but it fails to provide an implementation for the abstract exportToCSV() method, what happens?

The code compiles, but throws an error when the method is called.
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The compiler generates a default implementation automatically.
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The Task class automatically becomes an interface itself.
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The compiler triggers an error because Task failed to fulfill the interface contract.
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Question 4 of 4

4. Question

Why were default methods introduced in Java 8?

To allow interfaces to hold state variables like integers and strings.
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To allow us to add new methods to an interface without breaking the classes that already implement it.
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To prevent classes from overriding specific methods.
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To force all implementing classes to rewrite their code.
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