Everand Logo

Welcome to Everand!

  • Discover millions of ebooks, audiobooks, and so much more with a free trial

    From $11.99/month after trial. Cancel anytime.

    Cracking Kotlin Interview: Solutions to Your Basic to Advanced Programming Questions
    Cracking Kotlin Interview: Solutions to Your Basic to Advanced Programming Questions
    Cracking Kotlin Interview: Solutions to Your Basic to Advanced Programming Questions
    Ebook165 pages1 hour

    Cracking Kotlin Interview: Solutions to Your Basic to Advanced Programming Questions

    By Swati Saxena

    ()

    Read preview

    About this ebook

    This book covers all the possible interview and coding questions in Kotlin. This book is based on Kotlin programming language and its comparison to Java.

    With a complete overview of OOPs, null safety, generics, and many other exciting features, this book is a perfect choice for fresher and experienced Java developers who want to learn more about this alternative JVM language.
    LanguageEnglish
    PublisherBPB Online LLP
    Release dateApr 18, 2020
    ISBN9789389845273
    Cracking Kotlin Interview: Solutions to Your Basic to Advanced Programming Questions

    Read more from Swati Saxena

    Related to Cracking Kotlin Interview

    Related ebooks

    Operating Systems For You

    View More
    View More

    Related podcast episodes

    Related articles

    • UNLIMITED

      Create Smaller Sized Apps With React

      Nov 19, 2019

      You may not be surprised that some developers have criticised Electron (see tutorials LXF256), mostly regarding the memory usage of its final binaries. The initial binary is over 100MB, because a major chunk of code from Chrome is embedded. When you

      6 min read

    • UNLIMITED

      Disrupting Databases

      Nov 17, 2020

      Part of our last hacking feature in LXF258 involved setting up the Metasploitable virtual machine and attacking it. We’d encourage you to do that too, (you’ll find all the information you need at https://github.com/rapid7/metasploitable3). But this t

      3 min read

    • UNLIMITED

      How To Use Mojolicious For Web Scraping

      Mar 8, 2022

      Part One Don’t miss next issue! Subscribe on page 16 Mark Gardner is a software developer and blogger with over 25 years of IT experience. You can reach him at www.phoenixtrap.com and @markjgardner. The map function is designed to transform a list or

      5 min read

    • UNLIMITED

      Access Your Mac Anywhere

      Nov 8, 2022

      Access Your Mac Anywhere
      2 min read

    • UNLIMITED

      Create A RESTful Server In Go

      Oct 19, 2021

      Create A RESTful Server In Go
      8 min read

    • UNLIMITED

      An Introduction To Rabbitmq

      Jun 29, 2021

      RabbitMQ is a Message Broker, which means that it can safely hold messages generated by applications and make them available to other applications. The main advantages are reliability, support for clustering and high-availability queues, tracing capa

      1 min read

    • UNLIMITED

      Usability

      Oct 19, 2021

      Usability
      3 min read

    • UNLIMITED

      Basic Concepts

      Jul 2, 2019

      A messaging system such as Kafka enables you to send messages between processes, applications and servers. Applications connect to Kafka to send or get data. Strictly speaking, a Kafka ‘topic’ is a unit of storage in Kafka: data in Kafka is stored in

      1 min read

    • UNLIMITED

      Build A Mac Server

      Sep 19, 2023

      Build A Mac Server
      10 min read

    • UNLIMITED

      Websocket

      Mar 7, 2023

      Mihalis Tsoukalos is a systems engineer and a technical writer. He is the author of Go Systems Programming and Mastering Go. You can reach him at @mactsouk. This tutorial covers the WebSocket protocol and how to work with it using the Go programming

      8 min read

    • UNLIMITED

      Creating Flutter apps

      Aug 22, 2023

      Credit: https://flutterawesome.com/calculator-create-with-flutter/ David Bolton has been programming Flutter apps for a couple of years but this is the first time he’s done Flutter development on Linux. The Flutter plugin includes tools for insertin

      9 min read

    • UNLIMITED

      How To Develop A RESTful Client In Go

      Nov 16, 2021

      Mihalis Tsoukalos is a systems engineer and technical writer. He’s the author of Go Systems Programming and Mastering Go. You can reach him at @mactsouk. The subject of this month’s tutorial is RESTful services. In particular, you’re going to learn h

      9 min read

    • UNLIMITED

      Join the Pod, Man!

      May 30, 2023

      Join the Pod, Man!
      8 min read

    • UNLIMITED

      Top 10 Programming Languages

      Jan 5, 2023

      Top 10 Programming Languages
      8 min read

    • UNLIMITED

      Are Docker Containers a Good Idea for Laptops?

      Mar 31, 2020

      Docker containers are cool. If you haven’t yet played with Docker, you’re missing a large world of easily deployed applications. For example, I can deploy NodeRed, Plex, Jupyter Lab, and Nextcloud servers, and run them behind a Traefik reverse proxy

      2 min read

    • UNLIMITED

      Develop TCP/IP Servers And Clients

      Aug 23, 2022

      RUST OUR EXPERT Get the code for this tutorial from the Linux Format archive: www. linuxformat. com/archives ?issue=293. You can learn more about Rust at www. rust-lang.org. This month we’ll learn how to develop TCP/IP servers and clients in Rust

      10 min read

    • UNLIMITED

      What Is The Future Of Game Streaming Now That Stadia Is Dead?

      Oct 31, 2022

      Once hyped as being ‘the future of gaming’, the Google Stadia game streaming service was officially, just three years after launch and before even making it to Australian shores. When game streaming first launched we did have some apprehension about

      2 min read

    • UNLIMITED

      Metrics & Visuals In Go

      Nov 17, 2020

      Mihalis Tsoukalos is a DataOps engineer and a technical writer. He’s the author of Go Systems Programming and Mastering Go, 2nd edition. The subject of this tutorial is two-fold. First, it’s about creating a Go application that exports metrics to P

      7 min read

    • UNLIMITED

      Hacking Away

      May 2, 2023

      It was a great experience to attend the Collabora Productivity Hackfest and talks in Cambridge. Not just to get up to speed on the latest online office technologies – which you can read about on page 90 – but to meet and encounter the depth of enthus

      1 min read

    • UNLIMITED

      EBPF To Enhance Kubernetes Monitoring

      Apr 1, 2022

      The introduction of Docker and Kubernetes has brought a dramatic revolution in the IT industry. Unlike the traditional methods of developing and deploying software, Kubernetes or K8s uses scaling and automated deployment. Thanks to the Linux function

      4 min read

    Related categories

    Reviews for Cracking Kotlin Interview

    0 ratings

    0 ratings0 reviews

    What did you think?

    Tap to rate

    Review must be at least 10 words

      Book preview

      Cracking Kotlin Interview - Swati Saxena

      CHAPTER 1

      Core Concepts

      Name some features which Kotlin supports but not Java?

      Ans. Important Kotlin features that Java doesn’t have are:

      Null Safety

      Operator Overloading

      Coroutines

      Range expressions

      Smart casts

      Companion Objects

      Name some features which Kotlin supports but not Java?

      Ans. Two strings in Kotlin can be compared as:

      (a) Using == operator

      fun main(args: Array) {

      val a: String = kotlin is easy

      val b: String = kotlin is + easy

      if(a==b){

      println( a and b are equal.)

      } else {

      println( a and b are not equal.)

      }

      }

      (b) Using compareTo()

      fun main(args: Array) {

      var a: String = apple

      var b: String = apple

      var result = a.compareTo(b)

      if(result==0){

      println(Strings ‘$a’ and ‘$b’ are equal.)

      } else if(result < 0){

      println(’$a’ is less than ‘$b’ lexically.)

      } else{

      println(’$a’ is less than ‘$b’ lexically.)

      }

      b = banana

      result = a.compareTo(b)

      if(result==0){

      println(Strings ‘$a’ and ‘$b’ are equal.)

      } else if(result < 0){

      println(’$a’ is less than ‘$b’ lexically.)

      } else{

      println(’$a’ is less than ‘$b’ lexically.)

      }

      // passing ignoreCase to compareTo

      a = appLE

      b = aPple

      println(\nIgnoring Case…)

      result = a.compareTo(b, true) // ignoreCase = true

      if(result==0){

      println(Strings ‘$a’ and ‘$b’ are equal.)

      } else if(result < 0){

      println(’$a’ is less than ‘$b’ lexically.)

      } else{

      println(’$a’ is less than ‘$b’ lexically.)

      }

      }

      Output

      Strings ‘apple’ and ‘apple’ are equal.

      ‘apple’ is less than ‘banana’ lexically.

      Ignoring Case…

      Strings ‘appLE’ and ‘aPple’ are equal.

      Differentiate among ==, ===, .equals() in Kotlin?

      Ans.

      Structural Equality (‘==’)

      == operator is used to compare the data of two variables.

      == operator in Kotlin only compares the data or variables, whereas in Java or other languages == is used to compare the references.

      The negated counterpart of == in Kotlin is != which is used to compare if both the values are not equal to each other.

      Referential equality (‘===’

      === operator is used to compare the reference of two variable or object.

      It will only be true if both the objects and variables pointing to the same object.

      The negated counterpart of === in Kotlin is !== which is used to compare if both the values are not equal to each other. For values which are represented as primitive types at runtime (for example, Int), the === equality check is equivalent to the == check.

      .equals method

      .equals(other: Any?) method is implemented in Any class and can be overridden in any extending class.

      .equals method compares the content of the variables or objects just like == operator but it behaves differently in case of Float and Double comparison.

      Example:

      val first = Integer(10)

      val second = Integer(10)

      println(first == second) //true

      println(first.equals(second)) //true

      println(first === second) //false

      ………….

      class Employee (val name: String)

      val emp1 = Employee(Swati)

      val emp2 = Employee(Swati)

      println(emp1 == emp2) //false

      println(emp1.equals(emp2)) //false

      println(emp1 === emp2) //false

      println(emp1.name == emp2.name) //true

      println(emp1.name.equals(emp2.name)) //true

      println(emp1.name === emp2.name) //true

      Explain the use of init() in Kotlin?

      Ans. A constructor is used to initialize the class properties. It is a special member function which is called when an object is instantiated (created).

      In Kotlin, there are two constructors:

      (a) Primary constructor:used to initialize a class

      (b) Secondary constructor:allows you to put additional initialization logic

      The primary constructor is part of the class header.

      Example:

      class Student(val subject: String, var fee: Int) {

      // class body

      }

      The primary constructor has a constrained syntax, and cannot contain any code.

      To put the initilization code (not only code to initialize properties), initializer block is used. It is prefixed with init keyword.

      Example:

      fun main(args: Array) {

      val student1 = Student(swati, 25)

      }

      class Student(Name: String, Age: Int) {

      valname:String

      var age: Int

      // initializer block

      init {

      name= Name.capitalize()

      age = Age

      println(First Name = $name)

      println(Age = $age)

      }

      }

      What is repeat() in kotlin?

      Ans. Repeat statement is like while loop, which executes a block of code, N-number of times (without any condition).

      If you want to print a statement for N times without condition or looping, repeat() is used in Kotlin.

      Example:

      fun main(args: Array) {

      repeat(5) {

      println(Swati Computers)

      }

      }

      How does the program written in Kotlin run and what is the entry point of Kotlin programs?

      Ans. The Kotlin program once compiled, can run on standard Java Virtual Machine (JVM) like other programming codes. And, like many other programming languages main() function is the entry point of the Kotlin.

      State the differences between Val and Var?

      Ans.

      Val: Val, which is the short form of value, is a constant and it cannot be changed once assigned.

      Var: Var, which is the short form of variable, is a storage location that accepts the reassignment of values that have the same data types.

      How to instantiate class in Kotlin?

      Ans. There is no new keyword in kotlin to instantiate a class.

      You can create class object as:

      class XYZ

      var a= XYZ()

      val b = XYZ()

      What is lazy and lateinit in kotlin?

      Ans. Both lazy and lafeinitare used to delay the property initialization in kotlin.

      Lazy is a method, which can be assign to val only. The value would be created at runtime when it is required.

      val x: Int by lazy{100 }

      Lateinit is a modifier, which is used to set the value to the var when required.

      Lateinit var y: String

      How to create static method in kotlin?

      Ans. Kotlin does not support static keyword. To create a static method, you can use a companion object.

      Example:

      In java:

      class Static

      {

      public static

      Enjoying the preview?
      Page 1 of 1