Kotlin vs Java – Difference between Kotlin and Java

This tutorial is about Kotlin vs Java i.e. difference between Kotlin and Java.

Kotlin and Java both are JVM based and platform independent languages and there are various similarities in them. Kotlin and Java program on compilation converted into .class file which is executed by JVM. Still there are various dissimilarities between them that I have discussed below in tabular form.

Kotlin vs Java

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Kotlin vs Java – Difference between Kotlin and Java

Kotlin Java
Developed By Kotlin was developed by JetBrains. Andrey Breslav was team leader of project Kotlin. First version of Kotlin was released in 2016. Java was developed by Sun Microsystems which was later acquired by Oracle Corporation. James Gosling was the lead developer of Java. First version of Java was released in 1995.
Code Size In Kotlin we have to write 30-40% less code as compared to Java. In Java we have to write more code as compared to Kotlin.
Null Safety Kotlin does not have null pointer exception problem. Various ways are provided to deal with this exception. NullPointerException is most common problem in Java that is occurred when we try to access a member having null reference.
Checked Exception Kotlin doesn’t have checked exception feature. Java have checked exception feature.
Operator Overloading Kotlin allows operator overloading. Programmer can define the operators working according to need. Java doesn’t support operator overloading.
Use of Semicolon It is optional to write semicolon at the end of statements. In Java each statement must be terminated by semicolon.
App Size Android app built with Kotlin has more size because it contains Kotlin as well as Java libraries. Also Gradle build time slower for Kotlin as compared to Java. Android app built with Java has less size as compared to Kotlin. Gradle build time for Java is little faster as compared to Kotlin.

There are various new features added in Kotlin that are not in Java. On the other hand some of Java features are missing in Kotlin also. You can learn difference between Kotlin and Java in detail by visiting below link of Kotlin official site.


Comment below if you have any queries or found any information incorrect and missing in above tutorial for Kotlin vs Java.

2 thoughts on “Kotlin vs Java – Difference between Kotlin and Java”

  1. The source you have mentioned are great and informative. I have also come accross this Kotlin Android tutorial. Thanks for sharing this article. Cheers!!!

  2. I think the decision not to have checked exceptions in Kotlin is a mistake that can be remedied, and the solution may work in a way better than in Java. I agree that Java checked exceptions are problematic, but I only agree to this because there was perhaps not enough foresight in their implementation. I make this assertion because, well, checked exceptions were a very new concept when they were first implemented in Java, and it is hard now for Java to revert these flaws.

    So, the sketch of a solution I think would be better is to have some form of modular control over how checked exceptions are handled in the code of a Kotlin project. This control would become part of the project’s descriptor. One could instruct the compiler that modules’ checked exceptions can be explicitly declared to be caught. The result being that source modules residing in a project where checked exceptions were caught needed to catch or explicitly throw these checked exceptions.

    Hence, I think Java’s checked exception mechanism, while valuable, has a flaw in its implementation. Kotlin might avert repeating this flaw by implementing a specific type of checked exception and writing code that ensures these exceptions are caught or explicitly thrown at the level of the project. The behaviour of the compiler can then be a decision levied by the developer at the project level.

    I hope that suggestion is useful.

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