A Review Paper on Kotlin Programming Language

International Journal of Trend in Scientific Research and Development (IJTSRD)
Volume 5 Issue 4, May-June 2021 Available Online: www.ijtsrd.com e-ISSN: 2456 – 6470
@ IJTSRD | Unique Paper ID – IJTSRD42529 | Volume – 5 | Issue – 4 | May-June 2021 Page 1182
A Review Paper on Kotlin Programming Language
Siddhi Sanjay Shinde, Prof. Pratibha Adkar
MCA Department, Modern College of Engineering, Pune, Maharashtra, India
ABSTRACT
There are many alternative programming languages like C,C++,JAVA,Python,
etc. Every artificial language has its advantages and downsides, features.
What’s Kotlin? Why the android developers choose this is often that Kotlin is
to enable mixed-language projects. Kotlin also introduces improved syntax,
still as concise expressions and abstractions. Using Kotlin with Java reduces
excessive boilerplate code, which could be a huge win for Androiddevelopers.
Kotlin has been included as another to the quality Java compiler. Many
concepts in Kotlin helps programmers to begin with Kotlin is meant to be an
industrial-strength object-oriented language, and a "better language" than
Java, but still be fully interoperable with Java code, allowing companies to
form a gradual migration from Java to Kotlin. Some benefits of Kotlin are that
semicolons are optional as an announcement terminator; in most cases, a
newline is sufficient for the compiler to deduce that the statement has ended.
Kotlin variable declarations and parameter lists have the information type
come after the variable name (and with a colon separator), thesameasBASIC,
Pascal, and Typescript.
KEYWORDS: Android, Architecture, Feature, Application of Java and Kotlin
How to cite this paper: Siddhi Sanjay
Shinde | Prof. Pratibha Adkar "A Review
Paper on Kotlin Programming Language"
Published in
International Journal
of Trend in Scientific
Research and
Development(ijtsrd),
ISSN: 2456-6470,
Volume-5 | Issue-4,
June 2021, pp.1182-
1185, URL:
www.ijtsrd.com/papers/ijtsrd42529.pdf
Copyright © 2021 by author (s) and
International Journal ofTrendinScientific
Research and Development Journal. This
is an Open Access article distributed
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Commons Attribution
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1. INTRODUCTION
Kotlin languages, including (butnotlimitedto)Java,Scala,C#
and Groovy. One in all the foremost ideas behind Kotlin is
being pragmatic, i.e., being a linguisticcommunicationuseful
for day-to-day development, which helps the users get the
task done via its features and its tools. Thus, many design
decisions were and still are influenced by how beneficial
these decisions are for Kotlin users. Kotlin may well be a
multiplatform, statically typed, general-purpose linguistic
communication. Currently, as of version 1.4, it supports
compilation to the following platforms.
JVM (Java Virtual Machine)
JS (JavaScript)
Native (native binaries for various architectures)
The type system of Kotlin distinguishes at compile time
between nullable and not-nullable types, achieving null-
safety, i.e., guaranteeing the absence of runtime errors
caused by the absence burning (i.e., null Value). Kotlin also
extends its static type system with elements of gradual and
flow typing, for better interoperability with other languages
and straightforward development. Kotlin is an object-
oriented language which also incorporates lots of functional
programming elements. From the object-oriented side, it
supports nominal subtyping with bounded parametric
polymorphism (akin to generics) and mixed-site
variance. From the functional programming side, it's first-
class support for higher-order functions andlambda literals.
This specification covers Kotlin/Core,i.e.,fundamental parts
of Kotlin which should function mostly the identical way
irregardless of the underlying platform.
2. APPLICATION DEVELOPMENT:
The platform organizations needed to develop, deploy and
manage mobile apps are made from many components and
tools which allow a developer to write, test and deploy
applications into the target platform environment.
A. Front-end development tools
Front-end development tools are focused on the user
interface and user experience (UI-UX) and provide the
following abilities:
UI design tools
SDKs to access device features
Cross-platform accommodations/support
B. Back-end servers
Back-end tools pick up where the front-end tools leave off,
and provide a set of reusable services that are centrally
managed and controlled and provide the following abilities:
Integration with back-end systems
User authentication-authorization
Data services
Reusable business logic
IJTSRD42529

International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470
Figure 1: shows how all the modules should interact
3. WHAT IS KOTLIN?
It is an open-source statically typed artificial language
designed by JetBrains. Yep, the identical guys who created
IntelliJ IDEA. You will say “IntelliJ is that the best IDE for
JAVA, those people know the way to try to to the things, this
Kotlin can be a very good tool” – and you're right! I mean, if
you wish JAVA and think it's a cool language then Kotlin is
even cooler. Kotlin is object-oriented and supports
functional programming features. It’s designed for the JVM
(Java Virtual Machine). What does that mean? That’s fully
compatible with JAVA. Actually, to be honest, Kotlin is Java
with some extra pieces of stuff. What does that mean?Those
languages are often employed in parallel within the same
project. For instance, you'll be able to easily use JAVA
libraries in Kotlin’s project, but Kotlin gives you more out of
the box. It’s focused on interoperability, safety, clarity, and
tooling support. You’ll use it to a code Back-end server,
Android Apps or maybe iOS app usingKotlinNative.Another
interesting fact is that you simply can compile Kotlin to
JavaScript.
OK, that sounds good, but why is it better than JAVA? The
primary argument which involves my mind is Kotlin’s
syntax. When working with Kotlin, we are able to reduce the
code by plenty of lines. Such code are more transparent and
straightforward to grasp. JAVAcouldbea verynicelanguage,
but because the project expands, the amount of code lines
increases logarithmically. Eventually, you'll need a major
amount of your time to seek out what you're searchingforin
your code. Developers of Kotlin triedtoinduceeliminatethis
disadvantage, and that they did so o.k. i'll not show you each
difference in syntax because it might take way more space
than a blog article ever should, but I can explaintheessential
idea in simple cases. What number DTO objects have you
ever written? All of them looks almost like getters, setters,
hash Code, equals, to String, and constructors? For easy
objects like as an example Student together with his id first
Name, surname, age, country it'd be over 50 code lines.
4. KOTLIN ARCHITECTURE:
Kotlin could be an artificial language and has its own
architecture to allocate memory and produce a high quality
output to the tip user. Following are the various scenarios
where Kotlin compiler will work differently, whenever it's
targeting different other reasonably languages like Java and
JavaScript. Kotlin compiler creates a byte code which byte
code can run on the JVM, which is precisely adequate to the
byte code generated by the Java .class file. Whenever two
byte coded file runs on the JVM, they will communicate with
one another and this is often how an interoperablefeatureis
established in Kotlin for Java.
Figure 2: Kotlin Architecture
5. FEATURES OF KOTLIN:
Kotlin compiles to JVM bytecode or JavaScript Like Java,
Bytecode is that the compiled format for Kotlin programs
also. Bytecode means Programming code that, once
assembled, is run through a virtual machine rather than the
computer’s processor.
Kotlin can use all existing Java Frameworks and Libraries
Kotlin are often learned quickly, and it's approachable It are
often rapidly learned by simply reading the language
reference. The syntax is clean and intuitive(easy to use and
understand).
6. JAVA ARCHITECTURE :
Java Architecture is a collection of components, i.e., JVM,
JRE, and JDK. It integrates the process of interpretation and
compilation. It defines all the processes involved in creating
a Java program. Java Architecture explains each and every
step of how a program is compiled and executed.
Java Architecture can be explained by using the following
steps:
There is a process of compilation and interpretation in
Java.
Java compiler converts the Java code into byte code.
After that, the JVM converts the byte code into machine
code.
The machine code is then executed by the machine.
Figure 3: Java Architecture

7. FEATURES OF JAVA:
In Java, everything is an Object. Java may be easily extended
since it's supported the item model.
Java is intended to be easy to find out. If you understand the
essential concept of OOP Java, it'd be easy to master.
Java compiler generates an architecture-neutral object file
format, which makes the compiled code executableon many
processors, with the presence of Java runtime system.
8. THE PROBLEMS MANY COMPANIES FACEFORUSING
JAVA FOR APPLICATION DEVELOPMENT:
Java comes with limitations prefer it causes problems with
Android API design.
Being a verbose language, Java requires writing more
code because it carries a far better risk of bugs and
errors.
This linguistic communication is slower compared to
many other languages since it requires many memory.
The syntax that Java uses are going to be a small amount
complicated or cumbersome while comparing to other
languages like C + or Python.
With Java, it's impossible to access certain content
which is able to be incompatible with the device or
equipment getting used.
It isn’t easy to access the new Java enhancements in
mobile development.
There are times when Java causes problems with
Android API design.
Test-DrivenDevelopmentforJava requireswritingmore
code and carries some way higher risk of programming
errors and bugs
Java could also be a small amount slower with relation
to other programminglanguagesandtakesmanysystem
memory.
9. FUNCTIONS IN KOTLIN:
Function may perhaps be a gaggle of inter related block of
code which performs a particular task. Functionisemployed
to interrupt a program into different sub module. It makes
reusability of code and makes programmoremanageable. In
Kotlin, functions are declared using fun keyword. There are
two types of functions counting on whether it's available in
standard library or defined by user.
Standard library function
Kotlin Standard library function is built-in library functions
which are implicitly present in library and available for use.
For example
fun main(args: Array<String>)
{
var number = 25
var result = Math.sqrt(number.toDouble())
print("Square root of $number is $result")
}
User defined function
User defined function is a function which is created by user.
User defined function takes the parameter(s), perform an
action and return the result of that action as a value.
Kotlin functions are declared using the fun keyword. For
example:
fun functionName() {
// body of function
}
10. CLASSES AND OBJECT IN KOTLIN:
Kotlin Class
Kotlin class is similar to Java class, a class is a blueprint for
the objects which have common properties. Kotlin classes
are declared using keyword class.
Syntax of Kotlin class declaration
class className { // class header
// property
// member function
}
Kotlin object
Kotlin object is created in two steps, the first is to create
reference and then create an object.
var obj1 = className()
11. CONSTRUCTOR:
Kotlin has two types of Constructors primary as well as
secondary constructor. Constructoristhekeywordisusedto
declare the secondary constructoranditshouldalwaysrefer
to the primary constructor.
Secondary constructors are not at all common in Kotlin
language. We mainly use Secondary constructor is when we
need to extend the class which provides multiple
constructors that initializes the class in different ways.
Following is an example of Secondary Constructor:
Class Login {
constructor(data1: String) {
// some code to be written
}
constructor(data1: String, number: Int) {
//some codeto be written
}
}
This Secondary constructor feature is missing in Java as the
main objective of Secondary constructor is it reduces the
lines of code.
12. CODE DIFFERENCES:
Developers now praise Kotlin for being concise.Thiswasthe
quality which Java is not used to, however, java is more
readable over concision. The Java code is big and time-
consuming as compared to Kotlin as the Java code takes
more number of code and as compared to Kotlin takes very
less amount of code so that's why the developers are
switching to Kotlin to save time and energy.
Figure 4: Java Code

Above is the simple prime function which is written in Java.
As seen in the above diagram the Java code takes 19 lines of
code for a simple prime program. The code written is very
lengthy and time-consuming as compared to Kotlin code
which is shown in the diagram below.
Figure 5: Kotlin Code
It may not seem like much Java code but the Kotlin code of
this calculator can be written with less code of lines of the
code which took in Java code. The Kotlin code took only
around 14 lines of code which is half of the Java code for a
simple calculator.
Writing large and huge projects becomes easier when we
write code in Kotlin as compared to Java. The Kotlin
Syntax is concise and readable.
13. ADVANTAGES
OF KOTLIN:
Maximize the productivity
Kotlin may be a programming language that's supported
Java. Kotlin can easily get obviate aggravations furthermore
as obsolescence of Java. Kotlin could be a clear compact and
dynamic language. Kotlin can maximize the productivity of
the developer’s team because it takes little time to write
down and also you'll deploy it pretty fast.
Works with existing Java Code
Kotlin is interoperable with Java codes. Kotlin is persistent
with Java and then many other related frameworks and
tools. So switching to Kotlin is far easy. If the merchandise
you're building can’t only be written in Kotlin, you'll be able
to use the opposite one and both will beusedtogethereasily.
Less Buggy
As we all know Kotlin could be a clear andcompactcodebase
so it doesn't leave any space for creatinganymistakes,italso
helps to produce more stable codes in production. The
compiler will identify every possible mistake at a compile-
time span sans any tumult.
14. DISADVANTAGES
OF KOTLIN:
Different from Java
Though Kotlin and Java have too many resemblances but
still, there are some differences too. App developers just
can’t make the switch if they need inadequate knowledge
about Kotlin.
Compilation Speed
In some cases, Kotlin works even faster than Java while
performing incremental builds. Butitshouldbe remembered
that Java will still stay incomparable after we speak about
clean building.
Less Kotlin professionals
Kotlin has the sky-high popularityindeveloper’scommunity
still only few programmers areavailableduringthisfield.the
very fact about Kotlin is developers have to have in-depth
knowledge about this language but nowadaysit'sreallyhard
to search out experienced experts within the domain of
Kotlin.
15. CONCLUSION:
Kotlin is overall a programming language that every coder
has ever dreamt of, when working tediously on Java. It
makes Android programming lot more interesting and easy
to learn. It reduces complexity of code and helps you take
care in managing your code in a crisper manner. Taking
everything into account,ifyouareanAndroiddeveloper, you
got to give Kotlin a try. Its automated syntax converter that
detects Java code as soon as you paste it in your current file,
is a boon since it converts most of the Java code seamlessly.
What else would you want a programming language to be
like? In a nutshell, Kotlin is the next big thingthatyoushould
totally switch to, if you are a hardcore Android lover. Even
after some of the drawbacks that it still has, it helps yousave
ample amount of time in a much neater and helpful way. So
go ahead, grab on your PC, download the Kotlin plugin for
your Android Studio and get started. There won’t be any
better time to learn Kotlin since it’s newly arrived and not
many people have a major experience with it.
16. REFERENCES:
[1] Java vs. Kotlin: Should you be usingKotlinforAndroid
Development? by Jessica Thornsby -
https://code.tutsplus.com/articles/java-vs-kotlin-
should-you-be-using-kotlin-for-android-
development--cms-27846
[2] Kotlin (Programming Language) -
https://en.wikipedia.org/wiki/Kotlin_(programming
language)
[3] AndroidDoc (2018a) Array map android developers.
URL
https://developer.android.com/reference/android/s
upport/v4/util/ArrayMap, [Online; accessed17-July-
2018]
[4] “What are the advantages of Kotlin over Java? “,
viewed on 8thMay, 2018, from
“https://www.quora.com/in/What-are-the-
advantages-of-Kotlin-over-Java
[5] Atomic Kotlin is the book and associated learning
resources by Bruce Eckel and Svetlana Isakova.
[6] Schildt, the Complete ReferenceJava,SeventhEdition,
Chapter 1, page 9
[7] https://en.wikipedia.org/wiki/Kotlin_(programming_
language)
[8] https://www.javatpoint.com/features-of-java
[9] https://www.udacity.com/course/kotlin-bootcamp-
for-programmers--ud9011
[10] https://kotlinlang.org/

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