Kotlin vs Java: Differences and Similarities

If you’re working in thriving fields like Android improvement, it is best to know the variations between two of essentially the most used programming language — Kotlin vs. Java.

Each Kotlin and Java take pleasure in immense reputation as programming languages. Typically, it may create confusion when it’s important to decide one language in your android improvement mission. Additionally, for many who wish to study a trending programming language, a lack of know-how about them makes it exhausting for them to determine. 

To resolve these issues, we carry you the highest variations between Kotlin and Java.

What Is Kotlin?

Kotlin is a brand new technology programming language that grew to become open-sourced in 2012. This language goals to carry the very best options of object-oriented programming and useful programming into one language.

what is Kotlin

This statically-typed language was designed to make use of in Android and JVM environments. Nonetheless, you should use it on Javascript and native machine code by way of LLVM. Android creator Google introduced in 2017 that they like Kotlin because the programming language for Android improvement.

Notable Options of Kotlin

  • Being a null-safe language, Kotlin can stop errors normally attributable to absent parameters that builders didn’t initialize accurately. 
  • Kotlin allows you to implement your data in Java. Therefore, builders can code Android apps utilizing each Java and Kotlin collectively. 
  • Whereas engaged on this language, builders don’t want to make use of “null” or “nil”. Consequently, errors attributable to lacking sorts and parameters may be prevented.
  • Kotlin doesn’t contain the usage of pointless tokens or key phrases. Therefore, the code stays concise, and builders can simply learn it.
  • Because of the automated getters and setters technology, writing and studying the code turns into simpler for the builders. 

What Is Java?

The only approach to outline Java is that it’s an object-oriented programming language. It runs in JVM (Java Digital Machine) and is normally used for backend or standalone app improvement.

what is Java

Operating Java in an internet browser required a Java applets plugin enabling. Nonetheless, this can be a difficult job and includes safety dangers. Fortunately, you’ll be able to run Java nearly on any OS.  

Furthermore, the Android working system is coded in Java. It makes it the go-to programming language for Android app improvement. 

Notable Options of Java

  • In contrast to programming languages like C and C++, Java is compiled into platform-independent byte code. Regardless of which platform you run it on, the JVM can interpret the byte code all around the internet.
  • The design of the Java language is really easy that one can study it with out a lot effort. When you perceive the fundamentals of OOP Java, mastering it is going to solely be a matter of time.
  • Since Java is an object-oriented language, builders can use it for prolonged tasks. 
  • Java is a superb choice if you wish to develop a virus-free and tamper-proof app. It even helps a public-key encryption-based authentication technique. 
  • Being an architecture-neutral and platform-dependent language, Java is extremely transportable. You may run it on any platform of your alternative.
  • In the event you evaluate Java with languages like C or C++, you’ll discover it extra dynamic than the remaining. Apps designed with Java comprise intensive run-time data that you should use to confirm and resolve object accesses at run-time.

Kotlin and Java: Similarities

Kotlin and Java: Similarities

Earlier than we evaluate Kotlin vs. Java, let’s take a look at the similarities between these two languages. 

  • Essentially the most distinguished similarity is that they each compile to bytecode which will get executed by the JVM. 
  • Each Java and Kotlin assist object-oriented programming.
  • Kotlin and Java have comparable programming syntax, although they aren’t precisely the identical. Nonetheless, a Java developer can perceive Kotlin code with out a lot problem.

Kotlin vs. Java: Variations

On this part, we’ve got mentioned the variations between Java and Kotlin.

Kotlin vs. Java: Differences

Null Security

A NullPointerException happens while you try to make use of a reference pointing to a null location in reminiscence whereas referencing an object. These points are virtually not possible to forestall, and your app can crash once they happen.

Kotlin is a null-safe language that retains you secure from this challenge. A Kotlin variable is non-nullable by default that throws an error throughout compilation. Programmers who need a null variable have to outline it explicitly. Therefore, you’ll not see any Kotlin app crashing at run-time because of a null pointer as a result of it detects any doable NullPointerExceptions at compile time.

Java programmers already know why individuals name NullPointerExceptions their mortal enemies. Whereas engaged on this language, builders should usually examine for doable NullPointerExceptions and deal with them to forestall them from occurring throughout run-time and initialization.


If you’re speaking about object-oriented programming, inheritance is one among its important ideas. It implies that the hierarchical class construction ensures {that a} baby class naturally inherits the properties of a dad or mum class.

Kotlin builders can use extension capabilities to attain prolonged options with out creating a brand new class. Consequently, you want to cope with fewer code and courses with these extension capabilities.

Java customers have to create a brand new baby class in the event that they wish to lengthen the performance of an current class. This new baby class not solely inherits from the dad or mum class but in addition provides house for additional performance.

Kind Inference

In Kotlin, there isn’t a have to declare the variable sort explicitly. Even when you don’t pronounce it, Kotlin will assume the sort.

In Java typing, it’s important to explicitly specify the sort (string, float, and so forth.) whereas declaring a variable. Additionally, to make use of an outlined primitive variable as a special primitive sort, builders should explicitly “solid” a variable to the opposite sort. The identify of this course of is typecasting.

The sensible casts characteristic is accessible on Kotlin. With this attribute, you hardly ever have to typecast your variables explicitly. The language means that you can use the “is-checks” key phrase to make the compiler examine for immutable values and carry out implicit casting.

As you’ll be able to see, utilizing the sensible casting and sort inference of Kotlin, you’ll be able to do away with the manually typing and variable casting of Java.

Information Lessons

To create a category in Java includes writing some boilerplate code. To retailer information in a category, you could carry out duties like defining the constructors, toString capabilities, getter and setter strategies, the hashCode, and so forth. The entire thing is a trouble and may end up in some foolish syntax errors.

Data Classes

In the event you use Kotlin in your app mission, you should not have to cope with any such downside. The Kotlin characteristic of incorporating information courses can repair this challenge. For storing information in a category, builders have to outline a category utilizing the key phrase “information.” This step will mechanically produce the everyday boilerplate code throughout compile time. 

This performance considerably will increase readability and eliminates pointless fluff out of your code.

Checked Exceptions

Java helps checked exceptions, an surprising occasion or error that happens throughout the run-time of program execution. When these exceptions are checked at compile-time, they’re referred to as checked exceptions.

On the flip facet, Kotlin provides no assist for checked exceptions. So, even with uncaught exceptions, this language doesn’t throw any errors at compile time. Nonetheless, many programmers assume eradicating checked exceptions from Kotlin was horrible. 

Practical Programming

Functional Programming

Practical programming is a characteristic that units these two languages aside. This programming paradigm connects every thing in a pure mathematical capabilities fashion. It reduces code redundancy, simplifies the options to math issues, and improves maintainability.

Kotlin includes useful strategies, together with operator overloading, lazy analysis, and higher-order capabilities. So, you probably have a useful programming background, you’ll be able to simply study Kotlin. Nonetheless, no useful programming idea is accessible on Java.

Scalability and Reliability

Whereas engaged on a improvement mission, your language must be scalable and dependable. In these two elements, each Kotlin and Java are comparable. Additionally, these rely on how builders write the code utilizing the language.

Whereas Kotlin provides a null security characteristic to make the code extra dependable, Java can obtain the identical outcome by checking and catching null pointer exceptions.

Reminiscence Utilization

Reminiscence is one other necessary efficiency metric to weigh in these two languages. Everybody needs their app to load and run quicker, which implies decrease reminiscence utilization that helps quick program execution.

On this facet, Kotlin is lagging behind Java. In the event you assume that top reminiscence utilization can hamper your app’s consumer expertise, it is best to use Java.


In comparison with Java, Kotlin is simpler to learn due to its null pointer security characteristic and information courses. Apart from having higher readability, Kotlin comes with a concise code the place you’ll be able to simply perceive the core logic and discover bugs.

Studying Curve and Adaptability 

Java is without doubt one of the oldest languages that has been round for a very long time. The reason being easy: it’s comparatively simple to study and grasp for any wannabe or professional programmer. Furthermore, academics usually use Java to show object-oriented programming ideas to their college students.

Kotlin can also be an easy-to-learn language. Since it’s interoperable with Java, individuals discover it simple to undertake. Builders with Java tasks can add performance utilizing Kotlin code with out migrating their whole mission. Due to this fact, Java and Kotlin builders can seamlessly collaborate.

Documentation and Neighborhood

Java boasts an enormous developer group due to its presence within the improvement area for a very long time. Due to this fact, you usually tend to discover a decision to your downside from the huge and useful Java group.

Although Kotlin has comparatively fewer builders in its group, the adoption has elevated because the announcement from Google.

Within the following desk, we’ve got made face to face comparability between Java and Kotlin.

Standards Kotlin Java
Null Security It comes with the null-safe characteristic The null-safe characteristic isn’t obtainable in Java
Inheritance Doesn’t have to create a brand new class baby for prolonged functionalities We have to create a brand new class baby for prolonged functionalities
Kind Inference Specific declaration of variable sort isn’t wanted Requires express declaration of variable sort
Information Lessons Can simply incorporate information courses Cautious creation of knowledge courses is required
Checked Exceptions Doesn’t provide assist for Checked Exceptions Gives assist for Checked Exceptions
Practical Programming Out there in Kotlin Unavailable in Java
Reliability Null security characteristic Null pointer exceptions characteristic
Reminiscence Utilization Use extra reminiscence house Much less reminiscence utilization that facilitates fast app load
Readability Code is concise and straightforward to learn It comes with much less readability than Kotlin
Studying Curve and Adaptability  Straightforward to study and undertake Tremendous-easy to study and implement
Documentation & Neighborhood Has a rising group It has an enormous group

Is Kotlin Changing Java in Android Growth?

As you already know, Google has taken a Kotlin-first strategy to Android improvement and recommends others to develop such apps with Kotlin. Talking of Android Jetpack libraries, most of them are both written in Kotlin or assist its options.

Is Kotlin Replacing Java in Android Development

Then again, Google nonetheless provides 100% assist to Java for Android improvement. In the event you look into the prevailing Android apps, most are constructed with a mixture of Java and Kotlin code. Additionally, there may be not the faintest chance that Android will cease supporting Java quickly. 

If you’re questioning whether or not Kotlin will change Java for Android improvement, the reply is not any. Not solely Android SDK is written largely in Java, a lot of the Android apps you employ as we speak embody Java. Furthermore, the Android OS is constructed upon JVM. So, shifting from Java to Kotlin would imply a significant transformation within the Android ecosystem.

The above dialogue made it clear that Kotlin won’t utterly change Java. As a consequence of Google’s Kotlin first strategy, it’d lose some market share to Kotlin inside the Android ecosystem. Nonetheless, Java will stay a preferred programming language on the earth.

Wrapping Up

Each mission supervisor ought to know the important thing elements of a language that may decide the success of app improvement. After going by way of this submit, they may have the ability to perceive the variations between Kotlin and Java and discover out which one fits their necessities for growing highly effective Android apps.

Individuals who wish to study a programming language for a profession swap or begin their profession as a developer can even get benefitted from this submit. Relating to studying, it’s higher to study Java first after which Kotlin. For Java, you’ll be able to attempt any of those on-line programs.

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