2.3 - Why use Interfaces?
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Practice Questions
Test your understanding with targeted questions
What is an interface in Java?
💡 Hint: Think of it as a contract.
Can a class implement multiple interfaces?
💡 Hint: Recall the definition of multiple inheritance.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What is an interface in Java?
💡 Hint: Consider what ‘abstract’ means.
Is it possible for a class to implement more than one interface?
💡 Hint: Think about how different functionalities might be integrated.
2 more questions available
Challenge Problems
Push your limits with advanced challenges
Imagine you're creating a software application for an online store. Define an interface called 'Purchasable' with a method 'purchase()'. Implement this interface in classes 'Book', 'Electronics', and 'Clothing'. Describe how each class might behave differently when 'purchase()' is called.
💡 Hint: Think about the different purchasing processes for various item types.
You are asked to improve the maintainability of an application by introducing interfaces. Current classes have tightly-bound dependencies. Explain how you would use interfaces to achieve this goal.
💡 Hint: Consider how you can decouple components in your system.
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