||What Is Java|
|Subject:||Interpreting source code|
If you're going to wait until runtime to compile from Java bytecode to native, they ask, why not save the developer a step by interpreting not Java bytecode, but Java source?
Shameless-plug-department: The Kawa project (http://www.gnu.org/software/kawa) has taken this approach since 1996. Kawa compiles source code in multiple languages (Scheme, XQuery, Emacs Lisp) on-the-fly into Java bytecodes. If you type an expression or load a source file it gets immediately executed. However, function definitions and other complicated expressions get automatically and invisibly compiled to bytecodes which are immediately loaded using the Java