Package names

• Package names should be all lower case without underscores or other special characters.
• Package names begin with the reversed authority part of the web address of the company of the developer. This part can be followed a by project/program structure dependent package substructure.
• Don’t use plural form. Follow the convention of the standard API which uses for instance java.lang.annotation and not java.lang.annotations.
• Examples: com.yourcompany.widget.button, com.yourcompany.core.api

Class, Interface and Enum Names

• Class and enum names should typically be nouns.
• Interface names should typically be nouns or adjectives ending with …able.
• Use mixed case with the first letter in each word in upper case (i.e. CamelCase).
• Match the regular expression ^[A-Z][a-zA-Z0-9]*$.
• Use whole words and avoid using abbreviations unless the abbreviation is more widely used than the long form.
• Format an abbreviation as a word if the it is part of a longer class name.
• Examples: ArrayList, BigInteger, ArrayIndexOutOfBoundsException, Iterable.

Method Names

Method names should typically be verbs or other descriptions of actions

• They should match the regular expression ^[a-z][a-zA-Z0-9]*$.
• Use mixed case with the first letter in lower case.
• Examples: toString, hashCode

Variables

Variable names should be in mixed case with the first letter in lower case