What is the convention for word separator in Java package names

Question

How should one separate words in package names  Which of the following are correct   com stackoverflow my package  Snake Case using underscore  com stackoverflow my-package  Kebab Case using hyphens  com stackoverflow myPackage  Camel Case  com stackoverflow MyPackage  Pascal Case   What is the general standard

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Underscores look ugly in package names  For what is worth  in case of names compound of three or more words I use initials  for example  com company app ingresoegresofijo  ingreso egreso fijo  - gt  com company app iefijo  and then document the package purpose in package-info java

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Concatenation of words in the package name is something most developers don t do    You can use something like    com stackoverflow mypackage  Refer JLS Name Declaration

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Here s what the official naming conventions document prescribes      Packages      The prefix of a unique package name is always written in all-lowercase ASCII letters and should be one of the top-level domain names  currently com  edu  gov  mil  net  org  or one of the English two-letter codes identifying countries as specified in ISO Standard 3166  1981       Subsequent components of the package name vary according to an organization s own internal naming conventions  Such conventions might specify that certain directory name components be division  department  project  machine  or login names       Examples         com sun eng   com apple quicktime v2   edu cmu cs bovik cheese      References   java sun com - Code Conventions Naming     Note that in particular  anything following the top-level domain prefix isn t specified by the above document  The JLS also agrees with this by giving the following examples         com sun sunsoft DOE   gov whitehouse socks mousefinder   com JavaSoft jag Oak   org npr pledge driver   uk ac city rugby game      The following excerpt is also relevant      In some cases  the internet domain name may not be a valid package name  Here are some suggested conventions for dealing with these situations          If the domain name contains a hyphen  or any other special character not allowed in an identifier  convert it into an underscore    If any of the resulting package name components are keywords then append underscore to them    If any of the resulting package name components start with a digit  or any other character that is not allowed as an initial character of an identifier  have an underscore prefixed to the component        References   JLS 6 1 Package Names

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All three are not the conventions   Use com stackoverflow mypackage   The package names do not follow camel casing or underscores or hyphens package naming convention   Also  Google Java Style Guide specifies exactly the same  i e  com stackoverflow mypackage  convention      5 2 1 Package names      Package names are all lowercase  with consecutive words simply concatenated together  no underscores   For example  com example deepspace  not com example deepSpace or com example deep space           Google Java Style Guide  5 2 Rules by identifier type  5 2 1 Package names

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The official naming conventions aren t that strict  they don t even  forbid  camel case notation except for prefix  com in your example    But I personally would avoid upper case letters and hyphenations  even numbers  I d choose com stackoverflow mypackage like Bragboy suggested too    hyphenations  -  are not legal in package names   EDIT  Interesting - the language specification has something to say about naming conventions too   In Chapter 7 7 Unique Package Names we see examples with package names that consist of upper case letters  so CamelCase notation would be OK  and they suggest to replace hyphonation by an underscore   mary-lou  -   mary lou   and prefix java keywords with an underscore   com example enum  -   com example  enum    Some more examples for upper case letters in package names can be found in chapter 6 8 1 Package Names

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Anyone can use underscore    its Okay   No one should use hypen -  its Bad practice   No one should use capital letters inside package names  Bad practice   NOTE  Here  Bad Practice  is meant for technically you are allowed to use that  but conventionally its not in good manners to write   Source  Naming a Package docs oracle

[java] What is the convention for word separator in Java package names?

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