Java to kotlin translate

Java to Kotlin File Conversion

Many projects and applications are coded using Java programming language. In a Kotlin application, you can have Java files along with Kotlin files. But, if you like to convert your Java code to Kotlin code, you may do so.

To migrate from Java to Kotlin, Kotlin Official is providing tools via online, which is using official Kotlin site, or offline, which is using IntelliJ IDEA integrated development environment.

A quick route for the above said methods is given below.

1. Use IntelliJ IDEA Main menu -> Code -> Convert Java File to Kotlin File
2. You can use the online converter from Kotlin Official Website. https://try.kotlinlang.org/ -> Convert from Java

Of course, we shall go in detail using a step by step process and screenshots to better understand the process to convert Java code to Kotlin code.

Note: If you are using IntelliJ IDEA or any other IDE with Kotlin Plugin, you can write Kotlin code along with Java code in the same .kt file.

Use IntelliJ IDEA – Convert Java File to Kotlin File

IntelliJ IDEA is an Integrated Development Environment by JetBrains.

Following are the steps to convert your Java File to Kotlin File using IntelliJ IDEA,

Step 1: Open your Project in IntelliJ IDEA, and open the Java file.

Step 2: In the main menu bar, click on “Code”. Click on the item “Convert Java File to Kotlin File”

Step 3: If you get a message “Some code in the rest of your project may require corrections after performing this conversion. Do you still want to find such code and correct it too?”, you may click OK.

Step 4: Finally, your Java file is converted to a Kotlin file. Try running it.

Try Online “Convert from Java”

Step 1: Hit the URL “https://try.kotlinlang.org/” in your favorite browser and click on “Convert from Java” button, highlighted in the below picture.

Step 2: Paste you Java Code in the left editor box and click on “Convert to Kotlin” button present in the bottom right corner of the window.

Conclusion

In this Kotlin Tutorial, we learned how to convert Java File to Kotlin File.

If you are doing Android application development using Kotlin, you may refer how to convert Java File in Android application to Kotlin File.

Related Tutorials

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Java to kotlin translate

This free online converter lets you convert code from Java to Kotlin in a click of a button. To use this converter, take the following steps —

1. Type or paste your Java code in the input box.
2. Click the convert button.
3. The resulting Kotlin code from the conversion will be displayed in the output box.

Key differences between Java and Kotlin

Characteristic	Java	Kotlin
Syntax	Java has a verbose syntax with a lot of boilerplate code, whereas Kotlin has a concise and expressive syntax that reduces the amount of code needed to accomplish the same task.	Kotlin has a concise and expressive syntax that reduces the amount of code needed to accomplish the same task compared to Java.
Paradigm	Java is an object-oriented programming language that supports imperative and declarative programming paradigms, whereas Kotlin is a statically-typed programming language that supports both object-oriented and functional programming paradigms.	Kotlin is a statically-typed programming language that supports both object-oriented and functional programming paradigms.
Typing	Java is a statically-typed language, which means that the type of a variable is determined at compile-time, whereas Kotlin is also a statically-typed language but supports type inference, which means that the type of a variable can be inferred by the compiler.	Kotlin is a statically-typed language that supports type inference, which means that the type of a variable can be inferred by the compiler.
Performance	Java has a reputation for being fast and efficient due to its Just-In-Time (JIT) compiler, which compiles bytecode into machine code at runtime. Kotlin also has good performance, but it is slightly slower than Java due to its additional features.	Kotlin has good performance, but it is slightly slower than Java due to its additional features.
Libraries and frameworks	Java has a vast collection of libraries and frameworks, including Spring, Hibernate, and Struts, which are widely used in enterprise applications. Kotlin can also use these libraries and frameworks, but it also has its own set of libraries and frameworks, such as Ktor and Anko.	Kotlin can use Java’s vast collection of libraries and frameworks, but it also has its own set of libraries and frameworks, such as Ktor and Anko.
Community and support	Java has a large and active community with a wealth of resources and support available, including documentation, forums, and tutorials. Kotlin’s community is growing rapidly, but it is still smaller than Java’s.	Kotlin’s community is growing rapidly, but it is still smaller than Java’s. However, there are still a wealth of resources and support available, including documentation, forums, and tutorials.
Learning curve	Java has a steep learning curve due to its verbose syntax and complex concepts, such as object-oriented programming and memory management. Kotlin has a much gentler learning curve due to its concise syntax and ease of use.	Kotlin has a much gentler learning curve than Java due to its concise syntax and ease of use.

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Top 5 Java to Kotlin Converter Online in 2023

Kotlin and Java are two popular programming languages. Kotlin is an open-source language that runs on Java Virtual Machine (JVM). It lets you combine functional programming and Object Oriented Programming to create a self-sufficient, unrestrained, and distinctive platform.

Whereas, Java is a network-centric and object-oriented programming language available for multiple platforms. However, a significant chunk of programmers prefer Kotlin over Java as the former fills the gaps in the latter.

For example, Kotlin allows you to create extension functions, something Java does not allow. Such shortcomings of Java which are strengths of Kotlin trigger many developers to convert Java to Kotlin.

Are you also a programmer looking for an online converter to convert Kotlin to Java? If yes, you have arrived at the correct article.

This write-up introduces you to the best Java to Kotlin converters, along with some online tools to convert Kotlin code to Java if you wish to do so. Let us get started with them without any ado.

Best Online Tools to Convert Kotlin to Java and Vice Versa

The following are some of the top online converters for converting Kotlin to Java or Java to Kotlin depending on your requirements.

1. JavaInUse

Let us first introduce you to JavaInUse. It is among the most popular online Java to Kotlin converter tools. What we liked the most about this tool is its friendly interface. No matter whether you are an expert coder or a beginner, you can use this tool hassle-freely.

All you need to do is, put your Java code in the editable input section and click on the “Submit” button to get the result in Kotlin. Moreover, it also doubles up as an online Kotlin to Java converter.

The following is the link to try this one of the best online converters for changing Java to Kotlin or vice versa.

2. Android Studio

Next, we have Android Studio as one of the best Java to Kotlin converters. Most programmers prefer Android Studio as it is extremely easy to use.

With Android Studio, you can convert Java to Kotlin in three simple steps. Firstly, you need to open the file of the source code which is to be converted. Secondly, you are required to select the Android Project and right-click the source code file. Lastly, you should click on the option to convert Java File to Kotlin File.

Moreover, there is also an option to convert Kotlin to Java in Android Studio. Simply, open the Kotlin class or file, follow the path Tools>Kotlin>Show Kotlin Bytecode, choose JVM 8 target, and Decompile bytecode to change the code from Kotlin to Java.

3. IntelliJ IDEA

IntelliJ IDEA is yet another intelligent program to convert Java to Kotlin and the other way around. If you have IntelliJ IDEA at your disposal, you can make the conversion in two easy steps.

Firstly, open your project on IntelliJ IDEA, right-click the Java file, and choose the option that lets you convert Java file to Kotlin file. Lastly, click on Yes to convert the code from Java to Kotlin.

In case you want to convert Kotlin to Java online, IntelliJ IDEA functions as an excellent Kotlin to Java converter. You can make the necessary conversion by launching the Kotlin project, following the path Tools>Kotlin>Show Kotlin Bytecode, and selecting the Decompile option.

4. ExtendsClass

ExtendsClass can be a good choice if you are looking for a free online Java to Kotlin converter. This tool’s simplicity caught our attention at first glance.

You can convert your Java code to Kotlin online in three quick steps. You can simply input or drag and drop/copy and paste your code in the editor, select “convert” to compile your source code, and then “Download File” or “Copy to clipboard” your converted code.

Additionally, ExtendsClass also functions as an online Kotlin to Java converter. The steps to convert the code from Kotlin to Java remain the same as described above.

5. Kotlin Playground

Here comes Kotlin Playground, a fascinating online Kotlin to Java and Java to Kotlin converter. The best thing about this tool is that you do not need to be an expert to use it. Even novice programmers and developers can use Kotlin Playground to convert their codes from one coding language to another. Simply, try the tool from the following link to make code conversions.

Summing Up

In this article, we looked at the top Java to Kotlin converters and the tools to convert Kotlin codes to Java. You can choose any tool from the above list according to your requirements.

If you have any questions or suggestions about this article, please get in touch with us through the comments section. We will be pleased to hear from you and answer all your questions.

Siddharth Jain

Siddharth is a technophile who loves to share his knowledge and love for technology. He likes to pen down all his learning and observations that might help the tech readers. Apart from being a technophile, he is a well-learned pianist.

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