Sotirios-Efstathios Maneas

About Sotirios-Efstathios Maneas

Sotirios-Efstathios (Stathis) Maneas is a postgraduate student at the Department of Informatics and Telecommunications of The National and Kapodistrian University of Athens. His main interests include distributed systems, web crawling, model checking, operating systems, programming languages and web applications.

Online Java Compiler – What options are there

In this tutorial we will discuss about online Java compilers. Online Java compilers offer the ability to develop programs online, compile them, execute them and finally, download them. In case you don’t have the Java Runtime Environment (JRE) or the Java Development Kit (JDK) installed on your local machine, online compilers can help you overcome this situation by providing a text editor and an online compiler.

Moreover, online compilers can be useful when you don’t have the required permissions to install Java on a local machine and you do want to quickly execute a Java application. However, notice than an online compiler is not able to match the capabilities of an IDE, but is able to support a subset of an IDE’s operations. In the rest of this tutorial, we will discuss about a number of existing online Java compilers and their characteristics.

Compile Online

Compile Online provides the capability of online compilation and execution of a large number of programming languages, including Java. The interface for the Java programming language can be found here. The Java Virtual Machine (JVM) is being executed using the following parameters:

-Xmx128M -Xms16M

Thus, you should be careful while allocating memory for your application.

This website also provides the following features:

  • Creation of multiple Java files.
  • Command Line arguments.
  • Stdin input parameters.
  • Source code download.


Ideone is an online compiler and debugging tool which allows you to compile source code and execute it online. Alongside with Java, Ideone also supports a large number of programming languages. Ideone imposes the following rules about online compilation:

  • Duration of compilation: 10 seconds.
  • Duration of execution: 5 seconds for logged in users and 15 seconds for registered users.
  • Total memory usage: 256 MB.

Ideone also provides the following capabilities:

  • Syntax highlighting.
  • Stdin input parameters.
  • Source code download.


JDoodle provides an easy way to compile and execute Java code online. JDoodle contains a very attractive interface that offers the following features for execution:

  • Command Line arguments.
  • Stdin input parameters.
  • Source code download.
  • Auto completion.

Compile Java

Compile Java is a fast and functional online Java compiler that always runs the latest version of Java. Compile Java automatically splits multiple public classes to separate files.

Compile Java is able to provide the following features:

  • Optional command-line arguments.
  • Download compiled source files (.java, .class, .jar).
  • Online download link.
  • Syntax highlighting.


RexTester provides a simple interface to compile and execute Java code that also offers the following features:

  • Stdin input parameters.
  • Source code download.

This was a tutorial about Java online compilers.

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