JAVA VARIABLES

JAVA Variables

• Variables are container which is used to store some data values.
• The types and size of value will be declared by the data types.
• We use assignment operator (=) to assign a value to a variable.

Rules Must Be Followed:

⮚ The first character must always be an alphabet or an underscore.

⮚  It should be formed using only letters, numbers, or underscore.

⮚  Uppercase and lowercase are distinct

⮚  A keyword cannot be used as a variable name.

⮚  It should not contain any whitespace character.

⮚  The name must be meaningful.

Declaring The Variable

As a programmer we can create a variable in two approaches, you must specify the data type and assign it a value:

Approach 1:

datatype variable_name ;  //variable declaration

variable_name=value; //variable intialization

Syntax:

int a;

a=100;

Approach 1:

datatype variable_name=value;  //variable declaration and inialization

Syntax:

int a=100;

double b=100.11;

Program:

public class variable{

public static void main(String args[])

{

    int a = 10;

    System.out.println(a);

}

}

Output:

10