What is ideone?
Ideone is something more than a pastebin; it’s an online compiler and debugging tool which allows
to compile and run code online in more than 40 programming languages.
How to use ideone?
Choose a programming language, paste your source code and input data into text boxes. Then check or uncheck run code(whether to execute your program) and private (whether not to list your paste in the recent pastes page) checkboxes, click the submit button and watch your snippet being executed.
Java Compiler Snapshot:-
Click On image to Enlarge ..