Java Coding Convention and Rules to Declare the Name convention

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Java Naming conventions

Java Naming Convention For Classes

• Class name start with upper case letter and every inner word starts with upper case letter.
• This convention is also known as camel case convention.
• The class name should be nouns.

Example:- The example of java naming convention for classes are  listed below

String , StringBuffer ,InputStreamReader ……etc

public class Emp

{ 

//Business Logic

}  

Java Naming Convention For Interface

• Interfaces starts with upper case and every inner word starts with upper case letter.

Example:The example of java naming convention for Interfaces are listed below 

Serializable Cloneable RandomAccess…etc

interface Printable 

{ 

//Business Logic

}  

Java Naming Convention For Enum

• Enum starts with upper case letter and every inner word are starts with capital letter.

Example : 

Enum, ElementType, RetentionPolicy…etc

Java Naming Convention For Annotation

• Annotation starts with upper case letter and every inner word are starts with capital letter.

Example :
Override, FunctionalInterface …etc

Java Naming Convention For Method

•  Method name starts with lower case letter and every inner word starts with upper case letter.
•  This convention is also known as mixed case convention
• Method name should be verbs.

Example:-

 post() charAt() toUpperCase()

class Employee 

{ 

//method 

void draw() 

{ 

//Business Logic

} 

}  

Java Naming Convention For Variable

• Variables start with lower case letter and every inner word starts with upper case letter.

Example :-

 out in pageContext …etc

class Employee 

{ 

//variable 

int id; 

//Business Logic

}  

Java Naming Convention For Packages

• Package Package name is always must written in lower case letters.

Example :- 

java.lang java.util java.io …etc

  package com.javatpoint; //package 

class Employee 

{ 

//Business Logic

}

Java Naming Convention For Keywords

• Keywords While declaring keywords every character should be lower case.

Example: 

try,if,break,continue…..etc

Java Naming Convention For Constants

• Constants:-While declaring constants all the words are uppercase letters .

Example: MAX_PRIORITY MIN_PRIORITY NORM_PRIORITY

class Employee 

{ 

//constant 

 static final int MIN_AGE = 18; 

//Business Logic

}  

NOTE:- The coding standards are mandatory for predefined library & optional for user defined library

but as a java developer it is recommended to fallow the coding standards for user defined library also.