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Though you will find lots of it on the Internet the best and the most recent for your particular JDK is your JDK itself!
Every copy of JDK comes with a program called javadoc when javadoc is run with a class name as a parameter it produces the documentation for that class in HTML format.
(Note: this works with all the classes of the JDK and other classes where the Author has provided javadoc tags in his code, so when in doubt try).