Variable Declaration Rules in Java

Variable is an identifier which holds information or another variable is an identifier whose worth can be changed at the execution time of project. Variable is an identifier which can be utilized to distinguish info information in a project.

Language structure

Variable_name = esteem;

Guidelines to announce a Variable

  • Each variable name ought to begin with either letters in order or underscore ( _ ) or dollar ( $ ) image.
  • No space are permitted in the variable presentations.
  • But underscore ( _ ) no extraordinary image are permitted amidst variable assertion
  • Variable name dependably ought to exist in the left hand side of task administrators.
  • Greatest length of variable is 64 characters.
  • No watchwords ought to get to variable name.

Note: Actually a variable likewise can begin with ¥,¢, or some other cash sign.

Case of Variable Declaration


class Sum


open static void main(String[] args)


int _a, ¢b, ¥c, $d, result;






System.out.println("Sum is :" +result);




Entirety is : 100


Variable revelations

In which adequate memory will be dispensed and holds default values.

Sentence structure

Datatype variable_name;

byte b1;Variable in java

Variable instatement

It is the way toward putting away client characterized values at the season of portion of memory space.

Quality is doled out to a variable if that is as of now proclaimed or instated.

Sentence structure

Variable_Name = esteem

int a = 100;Variable

Sentence structure

int a= 100;

int b;

b = 25;/ – > direct allocated variable

b = a;/ – > doled out worth in term of variable

b = a+15;/ – > doled out worth as term of expression