Where is the standard java package located on the HDD?

When I do an import like this:

import java.awt.event.MouseEvent;

I can use the 开发者_Python百科methods/fields from that Class. I'm just wondering where this package is actually located on my HDD.

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It depends on your system and your JRE emplacement.

On Mac OS it's in /System/Library/Frameworks/JavaVM.framework/Home/bundle/Classes/classes.jar

On Windows or Linux in $JAVA_HOME/jre/lib/rt.jar (thanks @kuropenguin for the information)
$JAVA_HOME depending on where you've installed your JDK.

On other systems, you'll have to look for yourself.

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If you have the class present in Eclipse you kan find the physical placement in the Properties for the class.