In order to evaluate your statements instantly without creating a project and compiling whole source code, Oracle recently introduced JShell in Java 9. JShell is a similar tool like other compiled language own for statements interpretation, sometimes called REPL (read-eval-print loop). It helps programmer to quickly evaluate code snippets without compiling the whole code. read more http://coding-guru.com/jshell-java-9-interpreter-repl-getting-started-with-examples-and-video-tutorial/