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Kotlin Interview Questions and Answers

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Related differences

Java vs Kotlin

Ques 1. What is Kotlin?

Kotlin is an open-source, general-purpose, statically typed programming language. It is JVM-based and may be used in all projects where Java is currently used.

It may be used to create Android apps, server-side apps, and a variety of other applications. It is an improved version of Java and is completely interoperable with it. We can even mix Kotlin and Java in the same project.

It blends Object Oriented Programming (OOPs) and functional programming in a platform that is unlimited, self-contained, and unique. It also enables functional twinning using microcodes. 

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Ques 2. Who has created Kotlin?

The JetBrains team created Kotlin. The language was initially launched in February 2016 after a project began in 2010 to develop it. The Apache 2.0 license was used to create Kotlin. 

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Ques 3. Tell some good features about Kotlin?

  • Programs written in Kotlin do not require semicolons. This makes the code more readable and easy to understand.
  • This language enables the interchange and usage of Java in a variety of ways.
  • Furthermore, code written in Java and Kotlin can coexist in the same project.
  • The type system of Kotlin is designed to eliminate NullPointerException from code.
  • Writing new code in Kotlin will take you less time.
  • Kotlin code is even easier to deploy and manage at scale.

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Ques 4. Tell me about the top features of Kotlin.

  • Compact code: Kotlin is an OOPs-based programming language with code lines that may be reduced by up to 40% when compared to Java, making it an excellent choice for software development.
  • Open Source: Kotlin for Android is open-source and uses the JVM to combine the benefits of OOPs and functional programming.
  • Simple Language: When working with Kotlin, compiling the code is simple, resulting in improved performance for Android development. It also explains which types of data functions can be used throughout the code.
  • High number of extensions: Without modifying the code, Kotlin may support a variety of extension functions. It aids developers in making existing code more appealing and wonderful.
  • Full Java Interoperability: Java code can utilize Kotlin code, and Kotlin code can use Java code. So, if you're familiar with OOPS programming, switching to Kotlin development is simple. Also, if there are any Java-based applications, they can be used with Kotlin's environment.
  • Smart Cast: Smart casting is a technique that reduces the cost of an application while also improving its speed and performance. It uses typecasting or immutable data to manage the efficiency of programming. This technique is supported by Kotlin.
  • Low Learning Curve: Kotlin is preferred by businesses due to its low adoption cost. Most significantly, it is simple for developers to learn, especially if they have programming experience.

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Ques 5. What are the various data types available in Kotlin? Explain them.

Primitive data types are the most basic data types in Kotlin, and all others are reference types like array and string. Kotlin contains all data types as objects. Following are the different data types available in Kotlin:

Integer Data Type -

Data TypeSpace Required
byte8 bits
short16 bits
int32 bits
long64 bits

Floating Point Data Type - 

Data TypeSpace Required
float32 bits
double64 bits

Boolean Data Type - 

True or false is the only bit of information represented by the Boolean data type. In Kotlin, the Boolean type is the same as in Java. 

Data TypeSpace Required
boolean1 bit

Character Data Type - 

Small letters (a-z), capital letters (A-Z), numerals (0-9), and other symbols are represented by the character data type.

Data TypeSpace Required
char8 bits

String Data Type -

Strings are represented in Kotlin by the type String. A string value is often a sequence of characters enclosed in double quotations ("). The space required in this case depends on the number of characters in the string.

Array Data Type -

The Array class in Kotlin is used to represent arrays. It has the get and set functions that, due to operator overloading conventions, can be used as  ‘[]’  as well. The space required by the array also depends on the number of elements it posses.

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