Online Kotlin to Java Converter
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You can also type the input code below.
How to use this tool?
This free online converter lets you convert code from Kotlin to Java in a click of a button. To use this converter, take the following steps -
- Type or paste your Kotlin code in the input box.
- Click the convert button.
- The resulting Java code from the conversion will be displayed in the output box.
Examples
The following are examples of code conversion from Kotlin to Java using this converter. Note that you may not always get the same code since it is generated by an AI language model which is not 100% deterministic and gets updated from time to time.
Example 1 - Is String Palindrome
Program that checks if a string is a palindrome or not.
Kotlin
Java
Example 2 - Even or Odd
A well commented function to check if a number if odd or even.
Kotlin
Java
Key differences between Kotlin and Java
| Characteristic | Kotlin | Java |
|---|---|---|
| Syntax | Kotlin has a more concise and expressive syntax compared to Java. It supports features like null safety, extension functions, and operator overloading. | Java has a more verbose syntax compared to Kotlin. It does not support null safety, extension functions, or operator overloading. |
| Paradigm | Kotlin is a multi-paradigm language that supports both object-oriented and functional programming. | Java is an object-oriented language that supports some functional programming concepts through the use of lambda expressions. |
| Typing | Kotlin is a statically typed language that supports type inference. | Java is a statically typed language that does not support type inference. |
| Performance | Kotlin has similar performance to Java as it compiles to bytecode that runs on the Java Virtual Machine (JVM). | Java has good performance due to its efficient bytecode and just-in-time (JIT) compilation. |
| Libraries and frameworks | Kotlin has good interoperability with Java libraries and frameworks. It also has its own set of libraries and frameworks like Ktor and kotlinx. | Java has a vast ecosystem of libraries and frameworks like Spring, Hibernate, and Apache Struts. |
| Community and support | Kotlin has a growing community and is backed by JetBrains, the company behind popular IDEs like IntelliJ IDEA and Android Studio. | Java has a large and mature community with extensive documentation and support. |
| Learning curve | Kotlin has a relatively low learning curve for Java developers as it is interoperable with Java and has a similar syntax. It also has good documentation and resources. | Java has a moderate learning curve for beginners due to its verbose syntax and concepts like object-oriented programming and memory management. |
Frequently Asked Questions
How do I convert Kotlin to Java using CodeConvert AI?
Simply paste your Kotlin code into the input box and click the Convert button. Our AI will analyze your Kotlin code and produce equivalent Java code in seconds, preserving the original logic and structure.
Is the converted Java code accurate?
The AI produces high-quality Java code that preserves the logic and functionality of your original Kotlin code. It handles common patterns, data structures, and idioms for both Kotlin and Java. For complex or performance-critical code, we recommend reviewing and testing the output.
Can I also convert Java back to Kotlin?
Yes! CodeConvert AI supports bidirectional conversion. You can convert Java to Kotlin just as easily by using our Java to Kotlin converter. Try the Java to Kotlin Converter
Is the Kotlin to Java converter free?
Yes. You can convert Kotlin to Java for free without creating an account for up to 2 conversions per day. For more conversions and higher limits, sign in for free — every account gets 5 credits per day with support for up to 25,000 characters per conversion.
What types of Kotlin code can be converted to Java?
This tool can convert a wide range of Kotlin code to Java, from simple functions and algorithms to complete programs with classes, error handling, and complex logic. The AI understands both Kotlin and Java idioms and produces natural-looking code.
What are the benefits of signing in?
Signing in unlocks CodeConvert AI's Pro tool, which includes more powerful AI models, an integrated chat assistant, code execution, personal notes, conversion history, and an enhanced interface. Every account gets 5 free credits per day (renewed daily) with support for up to 25,000 characters per conversion — no credit card required.
