Can package name have underscore in Java?

Can package name have underscore in Java?

In Java you can use underscore ( _ ) in your package names and it conforms to Java naming conventions.

Can Java package names contain dashes?

The SUN-era Java Language Specification gives a suggested convention: If the domain name contains a hyphen, or any other special character not allowed in an identifier (§3.8), convert it into an underscore.

What are the naming conventions followed in Java?

Naming Conventions in Java

• Class names should be nouns, in mixed cases with the first letter of each internal word capitalized. Interfaces names should also be capitalized just like class names.
• Use whole words and must avoid acronyms and abbreviations.

Can package names have Underscores?

Package names are all lowercase, with consecutive words simply concatenated together (no underscores).

What is package keyword?

Using packages. In a Java source file, the package that this file’s class or classes belong to is specified with the package keyword. This keyword is usually the first keyword in the source file. Classes can also be used directly without an import declaration by using the fully qualified name of the class.

What is a named package in Java?

A package as the name suggests is a pack(group) of classes, interfaces and other packages. In java we use packages to organize our classes and interfaces. We have two types of packages in Java: built-in packages and the packages we can create (also known as user defined package).

Can package names have hyphens?

You are right, the simple answer is: You are NOT allowed to use the hypen in package names. If you have a unique package name build from a domainname containing a hyphen you have to translate it to the underscore.

What are variable naming conventions?

The rules and conventions for naming your variables can be summarized as follows: Variable names are case-sensitive. The convention, however, is to always begin your variable names with a letter, not ” $ ” or ” _ “. Additionally, the dollar sign character, by convention, is never used at all.

What is naming convention of identifiers in Java?

All identifiers should begin with a letter (A to Z or a to z), currency character ($) or an underscore (_). After the first character, identifiers can have any combination of characters. A keyword cannot be used as an identifier.

Can package name Camelcase?

Use com. stackoverflow. mypackage . The package names do not follow camel casing or underscores or hyphens package naming convention.

When to add underscore in package names in Java?

if the package name begins with a digit or other character that is illegal to use as the beginning of a Java name, or if the package name contains a reserved Java keyword, such as “int” the suggested convention is to add an underscore. So, underscore is suggested only in special cases, into which your naming problem does not seem to fall.

What is the standard convention for package names in Java?

Also, Google Java Style Guidespecifies 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, notcom.example.deepSpaceor com.example.deep_space.

Why does my Java package name start with an int?

This can occur if the domain name contains a hyphen or other special character, if the package name begins with a digit or other character that is illegal to use as the beginning of a Java name, or if the package name contains a reserved Java keyword, such as “int”.

Why are package names all lower case in Java?

Naming Conventions Package names are written in all lower case to avoid conflict with the names of classes or interfaces. Companies use their reversed Internet domain name to begin their package names—for example, com.example.mypackage for a package named mypackage created by a programmer at example.com.