API links

All of the above information is pretty much obsolete by now, it's all can be found in one place these days: http://www.javaref.com/

Java API's

API name	link
J2SE1.4.2	http://java.sun.com/j2se/1.4.2/docs/api/index.html
J2SE1.3.1	http://java.sun.com/j2se/1.3/docs/api/
J2EE1.4	http://java.sun.com/j2ee/1.4/docs/api/
JAXP 1.0	http://java.sun.com/xml/jaxp/dist/1.0.1/docs/api/
Xalan	http://xml.apache.org/xalan-j/apidocs/index.html

Online Web Tutorials from http://www.w3schools.com

name	link
HTML	http://www.w3schools.com/html/default.asp
XML	http://www.w3schools.com/xml/default.asp
XSL	http://www.w3schools.com/xsl/xsl_languages.asp
JavaScript	http://www.w3schools.com/js/default.asp

Jakarta

name	link
Commons Lang	http://jakarta.apache.org/commons/lang/api/index.html
Commons BeanUtils	http://jakarta.apache.org/commons/beanutils/api/index.html