Java Naming Conventions Collection 2021

Java Naming Convention Collection 2021.md

They must be followed while developing software in java for good maintenance and readability of code. Java uses CamelCase as a practice for writing names of methods, variables, classes, packages and constants.

camelCase

camelCase is a naming convention in which the first letter of each word in a compound word is capitalized, except for the first word.

  newStudent;
  getNewStudent()
  myVariableNameHere;

Classes and Interfaces

• Class names should be nouns, in mixed case with the first letter of each internal word capitalised. Interfaces name should also be capitalised just like class names.

• Use whole words and must avoid acronyms and abbreviations.

    interface Student
    class OldStudent implements Student
  
    interface Grade
    class ComputerGrade implements Grade

Methods

• Methods should be verbs

• camelCase

    void applyChangeOfGrade(int studentId);
    void addStudentComment(string newComment);
    void closedGradingPeriod(int gradingPeriodId);

Variables

• Variable names should be short yet meaningful.

• Variables can also start with either underscore(‘_’) or dollar sign ‘$’ characters.

• Should be mnemonic i.e, designed to indicate to the casual observer the intent of its use.

• One-character variable names should be avoided except for temporary variables.

• Common names for temporary variables are i, j, k, m, and n for integers; c, d, and e for characters.

  // variables for ComputerGrade class
  int studendId = 201812345;
  int year = 2021;

Constant variables

• Should be all uppercase with words separated by underscores (“_”).

• There are various constants used in predefined classes like Float, Long, String etc.

  static final int MAX_SCORE = 100;
  
  // Some  Constant variables used in predefined Float class
  public static final float POSITIVE_INFINITY = 1.0f / 0.0f;
  public static final float NEGATIVE_INFINITY = -1.0f / 0.0f;
  public static final float NaN = 0.0f / 0.0f;

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, like com, edu, gov, mil, net, org.

• Subsequent components of the package name vary according to an organisation’s own internal naming conventions.

  com.sun.eng
  ph.edu.univeristy.esb
  
  // java.lang packet in JDK
  java.lang