Java is a product of Sun Microsystems. Here are some Web sites that contain Java resources online, most of them at Sun:
http://developer.netscape.com/tech/java/— Netscape's “Java Developer Central” contains a good amount of useful information.
http://java.sun.com— This is the main Java site, and it's filled with information.
http://java.sun.com/docs/— The Java documentation is available online here. It's a good place to refer to.
http://java.sun.com/j2se/— You can find Java 2 Standard Edition 1.4, which is the current version of the Java software development kit, at this site.
http://java.sun.com/j2se/1.4/docs/index.html— This is the Java documentation for version 1.4.
www.javaworld.com— This site carries a great number of Java resources ...