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In JRE, Sun’s internal packages are prefixed with 2 top-level domains (sun and com). For example,
com.sun.security.jgss
sun.security.jgss
It seems pretty random to me which prefix they choose. I am curious what rules Sun uses for this.
The “com.sun” convention is the more preferable format because it follows the “naming conventions” that have been established for naming Java packages.
http://java.sun.com/docs/codeconv/html/CodeConventions.doc8.html
You’re supposed to use your unique company or personal website URL as the first few words in the package to guarantee uniqueness in the namespace. The ones that start with “sun” were probably not intended to be exposed to the outside world.