How to Choose the Best Online Java Compiler and Runner

We bet you’ve ever been in a situation like this before. You’re coding, doing your thing and everything is going great! Then the devil reincarnates himself in the computer in front of you, and the C++ compiler you were using just crashes. Aaargh! You just want to throw it from the tallest building and watch it smash into a thousand pieces!… Well, um, we don’t advocate for that.

What if there was a saner way of getting your work done without incurring the cost of a new computer? Well, there is! Because we’re here to help. Today, we’ll be discussing the best online Java compilers and runners you can find. But before we get into the juicy stuff, for the newbies reading this (we love you guys), let’s give you a crash course on what a Java compiler is and whether it’s handy in the Java functional programming.

What Is a Compiler

A compiler, in general, is a unique program that reads and processes information written in a given programming language and then converts the data into machine language; of which a machine can then utilize to execute a given function. There are quite a number of languages that a programmer can use to write codes and statements. Some worth mentioning are FORTRAN, COBOL, C, C++ and of course; the one, the only, the heavyweight champion…Java!

What Are the Pros and Cons of Using a Java Compiler?

  1. Programs created by compilers are efficient and further self-contained. One of the biggest advantages of using a compiler to create a program is that the program ends up being self-contained. What do we mean by this? Well, programs have already been compiled in machine language, thus they are ready to be read and executed by machines. You don’t have to purchase a second application. or some kind of package for execution. For example, say the program is compiled for Windows 10 on a 64x bit processor, all you require is Microsoft’s Windows operating system and you’re good to go!
  2. There is great hardware optimization. Despite the fact that focusing on one hardware package has its disadvantages, compiling a program specifically for the package in question can further increase the program’s performance. That’s because users of a program can be able to send specific and detailed options to the compiler regarding the specifications of the hardware it will be executed on. This then allows the compiler to generate a machine code that is extremely efficient under the hardware in question; as opposed to a more generic setup. One can truly optimize the performance of a program to suit their needs.
java compiler pros
java compiler cons
  1. Compilers cause programs to be hardware specific. The function of a compiler is to translate given code into a specified machine language. Because of this, the programs created are designed for specific operating systems such as Microsoft’s Windows, OS X, Linux; just to mention a few. That means for a programmer who is trying to market his product to a large audience, the developer must create different versions of the given code to be compatible with different systems. The developer thus has to spend days or even months doing that! And this ultimately delays the whole project.
  2. The compile time for large projects is exhausting. When it comes to creating simple programs, a compiler can be quick and awesome. You can get the program up and running in no time. The same cannot be said however for large projects. They can take quite a large amount of time to be compiled. This is especially so during the development stage. Oh, how much time programmers can spend just being idle!

So now that you are aware of the pros and cons of using a compiler during programming, you can plan yourself accordingly. If you are a pro-java compiler fan, here are 5 online java compiler websites that can be really helpful to you!

Pick the Best Online Java Code Tester

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1. CompileJava.Net

This is by far one of the simplest online tools to use for compiling, executing or even editing your given Java code. It has quite an efficient online java code tester. All you need to do is simply copy and paste your Java code. Then click on compile and you’re all set! You then get to see the results on the browser. This website has been online since 2013. And the best thing is that it’s free for use to all. That means using a free interpreter and debugging tool. And who doesn’t love freeware?


Browxy has an amazing online compiler and good java editor. It ranks to date as one of the most popular to use. That’s because it has a user friendly interface that makes the compiling process easy and fun! You first have to open an account with in order monitor your code. You can also submit some parts of your code online, and further access other users’ codes for educational purposes. The website further gives you 3 optional views.

  • Log view
  • Console view
  • Applet view

3. is an online programming website that provides multiple compiler options for quite a number of languages including Java. The great thing about this website is that you get the opportunity to share your work as well as sample that of others. That being said, their compiler and editor are very efficient; and are usually used in hackathons due to their speed and efficiency.


Tutorialspoint have one of the best Java compilers that offer multiple features such as creating and handling your own Java project, saving your developed code, and further downloading the code.

5. has one of the most comprehensive and pragmatic Java compiler’s online. You get awesome key features such as source code downloads, public code viewing; not to mention the option of syntax highlighting. You can further monitor your code at any instant.

How to Choose the One and Only

So there are our top 5 recommended online Java compilers! Still confused about which one to pick? Here are a few tips on choosing the right one for you:

  • Your project size determines the type of compiler to use. If you are working on a large project, you should probably go for an online compiler that allows online project saving, monitoring and so forth.
  • Check out the reviews from past and present users. This is important in helping you determine their credibility.
  • Test the waters first before committing fully to a given project.

So there you go! Instead of relying on how to compile Java in terminal, you can simply use the above online websites. If you’d like further info on Java compiling, just contact us and we will help you with any assignments or projects related to Java. We are more than happy to start an epic journey of transforming you into the Java guru that you are and share Java for everyone solutions!

Choose the best online Java compiler and runner to be your handy companion!