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.

[472 byte] By [eMerooa] at [2007-11-26 19:06:03]