NAMING CONVENTION

NAMING CONVENTION

The naming convention or rules in Java is classified into two categories: Pascal Naming Convention (PNC) and Camel Naming Convention (CNC). Generally, PNC method is used for classes whereas, CNC is applied for methods and variables.

         In PNC method, suppose if you want to name your class with many words like ‘xoxo waves’, then you have to name the first letter of each word in capital without leaving space.

Eg) public class XoxoWaves

         In CNC method, when more words are used in naming, the 1^st letter should be small whereas the other 1^st letter of each word should be typed in capitals.

Eg) int numberEleven=22;

         This is the universal naming format applied all over the world, so that people from anywhere can understand the Java language.

Important rules to remember

• ·      Semi-colon should be used at the end of each single statement
• ·      While defining a method or class, semi-colon is not used but curly braces are used instead
• ·      The statement after ‘//’ is not considered during compiler execution
• ·  For single line comments, ‘//’is used and for multi-line comments it becomes difficult to type ‘//’ at each line. Hence ‘/*’ is used at the starting line of the comment and ‘*/’ is used at the end
• ·      Comments are useful to recognize the code operation in future and it can also help others to easily understand the code
• ·   Variable names are case- sensitive in Java and hence must be carefully used to avoid error conditions
• ·      Variable names can have digits, letters and two signs ‘_’ (underscore) and ‘$’ symbols are allowed
• ·   Variable names can start with either an alphabet or sign but not with a numeral
• ·  Variable name should not be a keyword used in Java like int, byte, long,etc…

Defining a constant variable

Generally, the variables defined in Java can be subjected to several operations and can be varied. But a constant variable is one whose value is fixed throughout the entire programing. Changes made to this constant variable leads to error.

        class reference{
            public static void main(String args[]){
            byte no_1=22;
            no_1=33;
            System.out.println(no_1);
            }
        }

 In this code, the no_1 is initially assigned 22 but later it’s changed to 33. Hence while printing no_1, 33 is printed. Fixed constants should be declared with a key word ‘final’.

        final byte no_2=22;

        no_2=33;

        System.out.println(no_2);

 Here, the Java compilation process results in the following error since the no_2 variable is a constant. Hence, it’s clear that modifying a constant result in error.

Output error

PREVIOUS

                                                                                                                            NEXT