The Java documentation is in web pages.
If you have downloaded the Java documentation, it should be in a a directory like this one
Click on index.html to get the first page of documentation.
If, however, you get to it over the web, first go to http://www.javasoft.com/ . If it doesn't come up (it should be a new top-level window) then open a new browser window and try this link http://www.javasoft.com/ .
Follow the Documentation link to get to a page that allows you to get to a variety of documentation in a variety of forms. I had to scroll down a bit to get the jdk1.1.6 link:
Following the link to Java Platform 1.1 documentation, we come to the entry page of the documentation, the same page we would get to by clicking on index.html in the downloaded documentation (first image, above).
Click on the JDK API Documentation to skip down the page to this:
Click and you get to a list of the packages. You will spend most of your time in the documentation jumping around this page:
