Online Java Compiler: 10 Best Options for Students

Updated: Oct 11, 2020
8 min read

Why do you need an online Java compiler? Well, for many Java beginners, the requirement is very simple, and that is to play around with Java code to get a hang of programming, without getting into the trouble of setting up the system. 

For students, it is more about receiving and sharing code assignments with ease, with teachers, fellow students, and project teams. Furthermore, over the last few years, conducting interviews using online tools has become a common practice. Interviewers provide live coding problems to students, and students write programs live in the browser, compile the java code, run and get the results. 

This article will help you select the java compiler that suits your requirements, you might want to try a few before settling for the one that meets your requirements. Our team at has spent some time analyzing multiple java compilers and given below is the list of compilers that do the job best –

1. JDoodle

JDoodle is fast becoming the online java compiler of choice. It has one of the most simple and intuitive interfaces to play around with. You can easily write, edit, run, save, share, and evaluate your code in realtime, in the browser. You can save your projects for later use as well. 

JDoodle supports all standard Java libraries, you just have to start off with the coding. You can also add libraries available in the public domain on Maven with a couple of clicks. Apart from Java, JDoodle supports many other programming languages including C/C++, Python, Ruby, Scala, Groovy, Rust, Go, Kotlin, and many more. 

You also get URL for the code project, which can be shared with others with ease, and hence pair programming and peer review becomes an absolute breeze. 

JDoodle also comes with a feature that allows you to create online courses and assignments, it is the Guru plan of JDoodle but is currently absolutely free to use. 

Read more about JDoodle here at – JDoodle

2. GDB Online Compiler

GDB is a new entrant in the world of online compilers but a mighty one, offering a lot of features and ease of use. Like JDoodle, GDB compiler also supports multiple other languages and provides many productivity features. 

One feature that makes it very useful is the in-built debugger. You write programs, run into errors, set breakpoints to debug the code, and fix issues. Option to monitor variable values at breakpoints provides hints about the errors in the code.

Some other features include code formatter to beautify the code automatically, the option to download and save files, command-line arguments, and much more. 

Try GDB Online

3. – Java Online

Browxy is one of my favorites and is available out there for a few years now. Browxy is popular among beginners and provides a ready to use online java environment.

One cool thing about Browxy is the three views it provides, as below:

  1. Console view
  2. Applet view
  3. Log view for analysis and error reporting. 

You can create an account to keep track of your code, upload snippets, save projects, run through snippets, and to submit snippets publicly to help others and much more. 

Something that you might find cool about this tool is ready to use examples/snippets, you can open these snippets with one click, then compile, run, execute and see the results. Few example snippets include – CSV writer, password generator, Loan calculator, animated gif creator, and much more. 

Try Browxy

4. is the mighty beast and supports more than 50 programming languages online. Over the last few years, has grown from a very basic editor to a features rich online development environment, can’t really call it just an online compiler for java. 

The key USP of is being lightweight while still carrying all the features to help you write and compile code with ease and minimum effort. 

Key features offered by Repl.It include  – 

  • Option to include third party Jar files, libraries and java frameworks
  • Linting which is lightning fast
  • Debugger for catching the errors with ease
  • Hot module reload for live updates
  • Cloud support for saving projects
  • Many ready to use examples
  • Terminal emulator loaded with features
  • Some advanced features include API integration which can be used to include compiler features in third party websites or apps. 

Talking about the popularity of, it is used by teachers of many universities including Carnegie Mellon University, Trinket and Flatiron school to name a few. 

Check out –

5. to Compile Java Online

Well, Piaza is a new kid on the block, still in beta at the time of writing. Piaza, however, is more advanced and targets commercial space, it has a free version available though. interface is available in Japanese, English, and Spanish, you can choose what you want, with Piaza free version, you can save your code, link git account and auto-sync the code. 

There are few options to customize the editor, set themes, change fonts, colors, etc. and much more. It also offers features for realtime collaboration using team mode.

Piaza also has a cloud version for web development, where development environments of varied configurations are available ready to use. 

Try here – compiler online

6. Ground

This one is from the house of TutorialsPoint, which is a popular programming website that hosts tutorials on various programming languages including Java. While going through java tutorials, you can write, compile and run the code right there in the browser, and see the output live. 

Doesn’t offer too many features but does the basic job fairly well. You get options to save the code, create projects, download code, share, and much more. The key purpose is that students should not leave the website to compile the code elsewhere. 

Check out TutorialsPoint Java compiler here at – Coding Ground – Tutorials Point

7. also offers a very sophisticated java compiler and uses its own proprietary Sphere engine. Ideone lets you monitor the time taken for code execution, memory utilization, compiler errors, runtime errors, etc. and much more. 

You can customize the user interface as per your requirements, download the source code, mark the project public for others to use your code snippets, mark the code private for your own viewing later on, and much more. You also get a syntax highlighting option in here.

The proprietary sphere engine used by Ideone is also available for other businesses for commercial use and is used majorly in hackathons and coding interviews etc.

Read more here at –

8. Rextester – Simple Java Compiler

This is another good online java compiler, started off as a Regular Expression tester but is fast becoming a compiler of choice among the community of Java developers. 

I love the code wall feature on Rextester, where you see a running list of code snippets submitted by others, select one, run it, and see the result for yourself.

Collaboration is another cool feature of Rextester, start the code, share the URL with your team, and start editing together. 

Try Rextester

9. Cloud 9

Let us talk about an enterprise-grade cloud development environment as well. This is not just an online java compiler, this is a full-featured collaboration tool for large teams and for large scale complex projects. 

Cloud 9 is very popular among big organizations and is a leading commercial player in the market of online development tools. You wouldn’t miss a single feature that you find in an offline desktop java compiler. 

Talking about the mere mortals i.e. “students and beginner programmers”, Cloud 9 also has a free tier that offers one free public workspace, one private space, and a bit more which is more than enough to get started free of cost. 

Check Cloud9 here at – Cloud9


This one has a specific purpose and that is to hire developers remotely by conducting online interviews. Interviewers can create coding sessions and create with multiple candidates, who can work on the problems live in the browser and submit the code for executions. 

More information here at –


There are a number of compilers online these days bringing in a host of features. Most of the features that you used to see in offline tools are now available in one or the other online compiler. 

The world of online compilers might move more towards use case-specific tools. for example is in essence an online java compiler but focused mainly on creating sessions for conducting online interviews. 

JDoodle, ReplIt etc. focus more on student-teacher communication, where assignment creation and sharing become absolutely easy. Cloud9 is an enterprise-grade development environment. 

The era of setting up compilers on servers or local machines is gone now and we all love online compilers for the ease of use, connectivity, ease of sharing, and much more. Do share your experience with the online java compiler with our readers, via comments.

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