Inner class access to outer members in Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an inner class in Kotlin?

An inner class in Kotlin is a class defined inside another class that can access the members of its outer class directly.

intermediate

How does an inner class access the outer class's members?

An inner class can access the outer class's properties and functions directly using the <code>this@OuterClassName</code> syntax if needed.

beginner

What keyword is used to declare an inner class in Kotlin?

The <code>inner</code> keyword is used before the class declaration to make it an inner class that holds a reference to the outer class.

intermediate

What happens if you declare a nested class without the <code>inner</code> keyword?

A nested class without <code>inner</code> is static and cannot access the outer class's members directly.

intermediate

Show how to access an outer class property named <code>name</code> from an inner class in Kotlin.

Inside the inner class, use [e-mail] to access the outer class's name property.

Which keyword makes a Kotlin nested class an inner class with access to outer members?

A inner

B outer

C nested

D static

The inner keyword allows the nested class to access the outer class's members.

How do you refer to the outer class instance from inside an inner class?

A this.outer

B this@OuterClassName

C super

D outer.this

Use this@OuterClassName to explicitly refer to the outer class instance.

What is true about a nested class without the inner keyword?

A It cannot access outer class members directly

B It can access outer class members directly

C It is the same as an inner class

D It automatically inherits outer class

A nested class without inner is static and cannot access outer class members.

Which of these is a valid way to declare an inner class in Kotlin?

A static inner class InnerClass {}

B class inner InnerClass {}

C class InnerClass inner {}

D inner class InnerClass {}

The correct syntax is inner class InnerClass {}.

Why would you use an inner class instead of a nested class?

A To make the class static

B To prevent access to outer class

C To access outer class members easily

D To avoid creating an instance of outer class

Inner classes hold a reference to the outer class and can access its members.

Explain how an inner class in Kotlin can access the members of its outer class. Include syntax examples.

Think about how the inner class keeps a reference to the outer class instance.

Describe the difference between a nested class and an inner class in Kotlin regarding access to outer class members.

Focus on the presence or absence of the inner keyword.