The jars in the j2sdk1.4.2/lib directory provide the extra functionality of the java development environment - such as the java compiler. The jre/lib folder contains the non-developer runtime jars.
Tim
--------------------------- "Your morbid fear of losing,
destroys the lives you're using." - Ozzy
jre/lib/ext
is used for external jars - third party jars like oracle, apache, and other stuff.
You don't need to specify lib/ext in the classpath.
- So if you produce a standalone jar, use it explicitly.
- If you need multiple jars, but only seldom, use the classpath.
- If you have a jar which you use often, put it into lib/ext.
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