[news.eclipse.newcomer] Re: Eclipse how to: compile a single file or onl

[Jeff Myers <jefmyers@xxxxxxxxxx>]

Mansour,

If you have Build Automaticly enabled in your workspace, the Java source 
is built every time you save the file with modifications. The resulting 
class files are hidden in the Package Explorer, but you can see them in 
the Navigator view. So basically, everything should be automatically 
built, and you can export your JAR whenever you want.  Alternatively, 
you can set up an Ant task to build your project and create your JAR, 
and run that using the External Tools function.  Details for using Ant 
within Eclipse are available in the help docs.

Hope this helps,
 - Jeff