Kotlin Interfaces

What is an Interface?

An interface defines methods that a class must implement.

It allows flexible and reusable design.

Basic Interface

Implementing an Interface

Using the Interface

Multiple Interfaces

Default Methods

Interface Properties

Full Example

Why Interfaces are Important

• Enable abstraction
• Allow multiple inheritance
• Improve flexibility
• Used in real-world systems

Common Mistakes

• Forgetting override
• Trying to store state
• Not implementing required methods

Practice

Create an interface and implement it.

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