Java is a general-purpose programming language that is class-based and object-oriented. It is intended to let application developers write once, run anywhere (WORA), meaning that compiled Java code can run on all platforms that support Java without the need for recompilation. Java applications are typically compiled to bytecode that can run on any Java virtual machine (JVM) regardless of the underlying computer architecture.

Features:
- Compile and run your program
- View program output or detailed error
- Advanced source code editor with syntax highlighting, bracket completion and line numbers
- Open, save, import and share Java files.
- Customize the editor

Limitations:
- Internet connection is required for compilation
- Maximum program running time is 20s
- Some file system, network and graphics functions may be limited
- This is a batch compiler; interactive programs are not supported. For example, if your program provides an input prompt, enter the input in the Input tab prior to compilation.