Java Software has two separate bundles of source code that you can obtain at no charge:

• The Java 2 SDK, Standard Edition itself contains a file called src.zip that contains the source code for the public classes in the java package. Because this does not contain sun.* classes, you cannot do a complete build of the Java technology from these source files. These source files are for your information, to supplement the documentation, so you can see how Java technology works.
• The full source code release is available from us by going to the Community Source Code Licensing web site..

Source:Frequently Asked Questions About Java

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