Some students ask questions: How to get the help of JDK?
1 Online, you can go directly to http://java.sun.com/j2se/1.4.2/docs/api/ view API http://java.sun.com/j2se/1.4.2/docs/index.html View documentation
2 If you are not online, or when you are not satisfied, you can download the CHM version of JDK's help to http://dl5.mydown.com/test/ziliao/jdk140.chm to download the CHM version, ready-to-peer help file style
Since the file is more than 30 M, you can't release it to public mailbox, please download it yourself.