8. Datatype and Variable

Datatype

It is a container where we create variable to store data.

There are two types of datatypes :-

1) Primitive Datatype :- Primitive datatype helps the programmer to create primitive type variables which helps us to store primitive data.

2) Non-Primitive Datatype :- Unlike primitive data types, these are not predefined. These are user-defined data types created by programmers. These data types are used to store multiple values.

There are five types of non-primitive data types in Java. They are as follows:

1. Class

1. Object

1. String

1. Array

1. Interface

Variable

Variables are the container where we store data in java we create variable with the help of datatypes.

[Note - In java we cannot use a variable without declaring.]

Syntax - Datatype variablename ;
               byte age ;

Variable Initialization statement :-  Assigning value to create variable is known as variable initializing statement.

ex - age = 10 ;

grade = '*' ;

salary = 5.00.00f/f ;

Example for data declaration  -

class var1

{

public static void main (String[]args)

{

     int num ;

     char grade ;

     float salary  ;

}

}

   ## For Example, declaring and printing variable -

    class var2

    {

     public static void main (String [] args)

     {

       int number = 123456 ;

       char grade = ' * ' ;

       float salary = 5000.00f ;

      System.out.println(number) ;

      System.out.println(grade) ;

      System.out.println(salary) ;

     }

    }