java 2 SDK

You're on the right track.

If you are familiar with DOS, you can set with the following command:
PATH=c:\"program files"\java\jdk1.6.xxx\bin;%PATH%
However, you may be better off setting it using Window's environmental variables by:
Start/control panel/System/Advanced/Environmental Variables/
In the System Vairables Window, scroll down to PATH, highlight it and click the button "edit", and add the Java path, usually in the form of:
c:\program files\java\jdk1.6.0_0N\bin
Note that in Windows, the double quotes surrounding "Program Files" are not necessary.

An even better solution is to use a text editor that can compile and execute Java with the control-1/control-2 keys after your editing. One example is the editor called Textpad. They have it in many languages but not Chinese. There are instructions to install the Java options so there is a one-key compile and another for running. Textpad is free for trial, and a minimum for purchace at the following site:
http://www.textpad.com/

Another option is JCreator, which is dedicated to Java. It does a good job of editing, compile and run. The IDE is excellent. The paid version has an option whereby the method parameters are displayed during typing. It is completely free.
http://www.jcreator.com/

If you need more clarifications, PM any time.