Creating instances without new keyword in Kotlin - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an instance of the class without using the 'new' keyword.

Kotlin

class Person(val name: String)

val person = [1]("Alice")

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

Amake Person

Bnew Person

Ccreate Person

DPerson

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'new' keyword which is not used in Kotlin.

Trying to use other keywords like 'create' or 'make'.

In Kotlin, you create instances by calling the class name like a function, without using the 'new' keyword.

2fill in blank

medium

Complete the code to instantiate the data class without 'new'.

Kotlin

data class Car(val model: String, val year: Int)

val car = [1]("Toyota", 2020)

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

ACar

BCar()

Ccreate Car

Dnew Car

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'new' keyword.

Calling the class with empty parentheses when parameters are required.

In Kotlin, you create an instance by calling the class name with arguments directly, no 'new' keyword needed.

3fill in blank

hard

Fix the error by completing the code to create an instance of the class without 'new'.

Kotlin

class Book(val title: String)

val book = [1]("Kotlin Guide")

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

ABook

Bnew Book

Ccreate Book

DBook()

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'new' keyword.

Calling the class without required parameters.

Kotlin creates instances by calling the class name with parameters directly, no 'new' keyword.

4fill in blank

hard

Fill both blanks to create an instance of the class without 'new' and access its property.

Kotlin

class User(val username: String)

val user = [1]("john_doe")
println(user.[2])

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

AUser

Bname

Cusername

Dnew User

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'new' keyword to create instance.

Accessing a property name that does not exist.

Create the instance by calling the class name directly and access the property by its correct name.

5fill in blank

hard

Fill all three blanks to create an instance, call a method, and print the result without using 'new'.

Kotlin

class Calculator {
    fun add(a: Int, b: Int): Int = a + b
}

val calc = [1]()
val sum = calc.[2](5, 7)
println([3])

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

ACalculator

Badd

Csum

Dnew Calculator

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'new' keyword to create instance.

Calling a method name incorrectly.

Printing the wrong variable.

Create the instance by calling the class name directly, call the method by its name, and print the variable holding the result.