Interface declaration and implementation in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an interface named 'Drivable'.

Kotlin

interface [1] {
    fun drive()
}

Drag options to blanks, or click blank then click option'

ADrivable

BCar

CDriveable

DVehicle

Attempts:

3 left

💡 Hint

Common Mistakes

Using a class name instead of an interface name.

Misspelling the interface name.

The interface name should be 'Drivable' as declared.

2fill in blank

medium

Complete the code to implement the 'Drivable' interface in the 'Car' class.

Kotlin

class Car : [1] {
    override fun drive() {
        println("Driving the car")
    }
}

Drag options to blanks, or click blank then click option'

ADrivable

BRunnable

CVehicle

DDriveable

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong interface name.

Forgetting to override the 'drive' method.

The 'Car' class implements the 'Drivable' interface, so it must use 'Drivable' after the colon.

3fill in blank

hard

Fix the error in the code by completing the interface method declaration correctly.

Kotlin

interface Drivable {
    fun [1]()
}

Drag options to blanks, or click blank then click option'

ADrive

Bdrive

Cdriving

Ddrives

Attempts:

3 left

💡 Hint

Common Mistakes

Capitalizing the method name incorrectly.

Using a different method name than in the class.

The method name in the interface should be 'drive' to match the implementation.

4fill in blank

hard

Fill both blanks to declare an interface and implement it in a class.

Kotlin

interface [1] {
    fun start()
}

class Motorcycle : [2] {
    override fun start() {
        println("Motorcycle started")
    }
}

Drag options to blanks, or click blank then click option'

AStartable

BRunnable

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for interface and implementation.

Confusing interface names with class names.

The interface name is 'Startable' and the class 'Motorcycle' implements it.

5fill in blank

hard

Fill all three blanks to create an interface with two methods and implement it in a class.

Kotlin

interface [1] {
    fun start()
    fun stop()
}

class Bicycle : [2] {
    override fun start() {
        println("Bicycle started")
    }
    override fun [3]() {
        println("Bicycle stopped")
    }
}

Drag options to blanks, or click blank then click option'

AOperable

Cstop

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong method names in override.

Mismatch between interface and class names.

The interface is named 'Operable', the class implements it, and the method to override is 'stop'.