Multiple interface implementation in Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does it mean to implement multiple interfaces in Kotlin?

It means a class can follow the rules (methods and properties) of more than one interface, allowing it to have behaviors from all those interfaces.

beginner

How do you declare a class that implements two interfaces named A and B in Kotlin?

Use a colon and separate the interfaces with commas, like: <br> <code>class MyClass : A, B { ... }</code>

intermediate

If two interfaces have a method with the same name, how does Kotlin handle it when a class implements both?

Kotlin requires the class to override the method and explicitly specify which interface's method to use or provide its own implementation.

intermediate

What keyword is used in Kotlin to call a specific interface's method implementation inside an overriding method?

The keyword is super with the interface name, like super<InterfaceName>.method().

beginner

Why is multiple interface implementation useful in Kotlin?

It allows a class to combine different behaviors from multiple sources without inheriting from multiple classes, which Kotlin does not support.

How do you declare a Kotlin class that implements interfaces A and B?

A class MyClass implements A, B

B class MyClass : A, B

C class MyClass extends A, B

D class MyClass inherits A, B

In Kotlin, use a colon and separate interfaces with commas: class MyClass : A, B

What must you do if two interfaces have a method with the same name and your class implements both?

A Rename one of the interface methods

B Nothing, Kotlin handles it automatically

C Override the method and specify which interface's method to use

D Use inheritance instead of interfaces

Kotlin requires you to override the method and explicitly choose or provide your own implementation.

Which keyword lets you call a specific interface's method inside an overriding method?

A super<InterfaceName>.method()

B base.method()

C this.method()

D parent.method()

Use super with the interface name in angle brackets to call that interface's method.

Why can't Kotlin classes inherit from multiple classes?

A Because Kotlin supports multiple interface implementation instead

B Because Kotlin does not support inheritance

C Because interfaces are the same as classes

D Because Kotlin only supports single inheritance

Kotlin supports only single class inheritance but allows multiple interfaces to be implemented.

What is the main benefit of implementing multiple interfaces?

A Combining behaviors from different sources without multiple class inheritance

B Making code run faster

C Avoiding the use of classes

D Automatically resolving method conflicts

Multiple interfaces let a class have many behaviors without inheriting from multiple classes.

Explain how Kotlin handles method conflicts when a class implements multiple interfaces with the same method name.

Think about how you tell Kotlin which method to use.

Describe the syntax to implement multiple interfaces in a Kotlin class and why this is useful.

Focus on the declaration and the benefit.