Search inside the API

How can I search inside the API about a specific class or method?
For example I know that there a class called Scanner in the package of the java.util , but I can't find it
Also if I want to search about any method, can't I search about the method or the class inside the API by typing its name then find it.
I have already downloaded the JDK6 Doc,and use it
Is there any way for helping me?I face this problem many times.and I need help.

To search for a class, I go to:
http://java.sun.com/javase/6/docs/api/index.html
Press "all classes" in the top left frame then search the lower frame for the class name (Ctrl-F and type name in Firefox).
For a method, notice the "Index" link in the right frame -- it takes
you to an A--Z list of all methods.

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