What's a "java doc" or "java document"? Do you mean a file with extension .java, better known as a Java source code file? If so, you'll need to know the Java language before you can understand any of it.
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Or it used to be... Since they moved it to Oracle's servers the API pages tend to be very slow now and then. That's why it's a good idea to download the Javadoc pages and copy them to your local hard drive. Should the online pages give problems you can still browse your local copy.