Constant Names in Java

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The names of constants in interface types should be, and final variables of class types may conventionally be, a sequence of one or more words, acronyms, or abbreviations, all uppercase, with components separated by underscore _ characters Constant names should be descriptive and not unnecessarily abbreviated Conventionally they may be any appropriate part of speech Examples of names for constants include MIN_VALUE, MAX_VALUE, MIN_RADIX, and MAX_RADIX of the class Character
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Names of elds that are not final should be in mixed case with a lowercase rst letter and the rst letters of subsequent words capitalized Note that well-designed classes have very few public or protected elds, except for elds that are constants (final static elds) ( 686) Fields should have names that are nouns, noun phrases, or abbreviations for nouns Examples of this convention are the elds buf, pos, and count of the class javaioByteArrayInputStream and the eld bytesTransferred of the class javaioInterruptedIOException Obscuring involving eld names is rare
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Local Variable and Parameter Names
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A group of constants that represent alternative values of a set, or, less frequently, masking bits in an integer value, are sometimes usefully speci ed with a common acronym as a name pre x, as in:
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interface ProcessStates { int PS_RUNNING = 0; int PS_SUSPENDED = 1; }
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Obscuring involving constant names is rare:
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Constant names cannot obscure method names, because they are distinguished syntactically 687 Local Variable and Parameter Names
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Local variable and parameter names should be short, yet meaningful They are often short sequences of lowercase letters that are not words For example: Acronyms, that is the rst letter of a series of words, as in cp for a variable holding a reference to a ColoredPoint Abbreviations, as in buf holding a pointer to a buffer of some kind Mnemonic terms, organized in some way to aid memory and understanding, typically by using a set of local variables with conventional names patterned after the names of parameters to widely used classes For example:
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b for a byte c for a char f for a float
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One-character local variable or parameter names should be avoided, except for temporary and looping variables, or where a variable holds an undistinguished value of a type Conventional one-character names are:
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in and out, whenever some kind of input and output are involved, patterned after the elds of System off and len, whenever an offset and length are involved, patterned after the parameters to the read and write methods of the interfaces DataInput and DataOutput of javaio
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Constant names normally have no lowercase letters, so they will not normally obscure names of packages or types, nor will they normally shadow elds, whose names typically contain at least one lowercase letter
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i, j, and k for integers l for a long o for an Object s for a String v for an arbitrary value of some type Local variable or parameter names that consist of only two or three lowercase letters should not con ict with the initial country codes and domain names that are the rst component of unique package names ( 77)
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What s in a name That which we call a rose By any other name would smell as sweet
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Packages
PROGRAMS are organized as sets of packages Each package has its own set of
names for types, which helps to prevent name con icts A top level type is accessible ( 66) outside the package that declares it only if the type is declared public The naming structure for packages is hierarchical ( 71) The members of a package are class and interface types ( 76), which are declared in compilation units of the package, and subpackages, which may contain compilation units and subpackages of their own A package can be stored in a le system ( 721) or in a database ( 722) Packages that are stored in a le system may have certain constraints on the organization of their compilation units to allow a simple implementation to nd classes easily A package consists of a number of compilation units ( 73) A compilation unit automatically has access to all types declared in its package and also automatically imports all of the public types declared in the prede ned package javalang For small programs and casual development, a package can be unnamed ( 742) or have a simple name, but if code is to be widely distributed, unique package names should be chosen ( 77) This can prevent the con icts that would otherwise occur if two development groups happened to pick the same package name and these packages were later to be used in a single program