Why do package names often begin with "com" [duplicate] Why do package names often begin with "com" [duplicate] java java

Why do package names often begin with "com" [duplicate]


java package

It's just a namespace definition to avoid collision of class names. The com.domain.package.Class is an established Java convention wherein the namespace is qualified with the company domain in reverse.

java package

Wikipedia, of all places, actually discusses this.

The idea is to make sure all package names are unique world-wide, by having authors use a variant of a DNS name they own to name the package. For example, the owners of the domain name joda.org created a number of packages whose names begin with org.joda, for example:

  • org.joda.time
  • org.joda.time.base
  • org.joda.time.chrono
  • org.joda.time.convert
  • org.joda.time.field
  • org.joda.time.format

java package

It's the domain name spelt out in reverse.

For example, one of my domains is hedgee.com. So, I use com.hedgee as the base name of all my packages.

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