Java vs Kotlin: Key Differences

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Java vs Kotlin: Key Differences

Check out this post to learn more about the fundamental differences between Java and Kotlin.

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Java: Pros and Cons

When it comes to Android app development, a major portion of developers choose Java. This can be explained by the fact that Android itself was written in Java. 

Java was developed by Sun Microsystems over 20 years ago, which is now a property of Oracle. Nowadays, it is considered to be the second most active language on GitHub.


  • Has a large and well-versed community, therefore, a number of great educational materials
  • Relatively simple and clear, which makes it easy to master
  • A language with a lot of features, regularly updated, and open source
  • While mostly used for Android, Java works perfectly for cross-platform development
  • Has relatively high development speed
  • Applications created with Java are more lightweight than those that were made with the help of Kotlin
  • Has checked exceptions that improve error detecting and solving


  • Java requires a lot of memory and, therefore, can be slow sometimes
  • Not very suitable for Android API design because of a number of limitations
  • Requires a lot of manual work, which increases the number of potential errors

Kotlin: Pros and Cons

Kotlin is considered Java’s alternative, which was initially created to add more functions to Java and solve its most crucial problems. Like Java, Kotlin has object-oriented features but is not limited to them, since it also has functional ones.

The main purposes of this language are to ensure tooling support, interoperability, security, and legibility. It is matched with Java easily, so developers won’t have to learn it from the ground up if they already know Java. As for Java, it is used for Android app and desktop development.


  • Has user-friendly and understandable coding norms
  • Divides large apps into smaller layers and works faster and more efficiently with them
  • Doesn’t require any variable data type specifications, unlike Java
  • Uses a lot of function types and specialized language structures like lambda expressions
  • Allows developers to create extension functions easily, which are not available in Java
  • Provides a very simple and almost automated way of creating data classes


  • Has a small community of developers and, therefore, a lack of learning materials and professional assistance
  • Unlike Java, it doesn’t have a function of checked exceptions, which may lead to errors
  • Compilation may take more time with Kotlin than with Java
  • Doesn’t have public fields that allow callers of an object change accordingly to representation
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Published at DZone with permission of Galyna Sereda . See the original article here.

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