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From: markspace <markspace@nospam.nospam>
Newsgroups: comp.lang.java.programmer
Subject: Re: Where is Java class located on Linux systems?
Date: Sat, 21 Jun 2014 23:52:09 -0700
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On 6/21/2014 8:52 PM, Tom Tylor wrote:

> For the "import ...;" lines, I just wonder where the class files are
> located on my system. Can anyone help?
>

On the classpath.  I'm a little fuzzy on the exact details, and it 
depends what tool you use (each IDE will have its own rules, for 
example) but generally speaking each tool will read the classpath to 
resolve any imports.

http://docs.oracle.com/javase/tutorial/essential/environment/paths.html

The latest compilers (javac) use a special abbreviated file to reference 
system classes.  This doesn't include classes from rt.jar which you 
normally shouldn't access.  So if a class from the sun.* hierarchy stops 
being located during a compile, you have to use a special little bit of 
magic to get javac to use the full rt.jar.