java class loader

[Raj Joe]

steps
1.I install JDK
2.Set path for bin directory in my env variable
3.Write a simple java class
4.Run the java class with commend (java test.java)

How are JDK classes loaded for test.java(which imports eg java.io.* etc).
How does Java commend recognize the jdk classes.

[Tony Morris]

http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ClassLoader.html
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html [getContextClassLoader method - this forum won't allow the direct link]