Variables and Data types in Java

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Variables:

Variables are used to store data in a computer’s memory. In other words, we can say, variables are just like a container that holds the value while the java program executed. There are three types of variables in java:

1- Local

2- Instance

3- Static

Rules for declaring identifier (Variable name)

1- All identifiers must begin with a letter, currency character, or underscore.

2- Blank spaces are not allowed.

3- An identifier name is case-sensitive.

4- A keyword cannot be used as an identifier.

Declaring variables:

byte age = 28;

short salary =32500;

float price = 25.50f;

char name = ‘v’;

boolean flag=true;

Data types:

There are two types of data types in java.

1- Primitive Data type

2- Non- primitive Data types

Primitive Data type:

There are mainly eight types of primitive data types:

Types	Size	Range	Default Value
byte	1 Byte	[-128, 127]	0
short	2 Byte	[-32,768 , 32,767]	0
int	4 Byte	[-2³¹ , 2³¹-1 ]	0
long	8 Byte	[-2⁶³ , 2⁶³-1]	0
float	4 Byte	[-] See Java Doc	0.0f
double	8 Byte	[-]See Java Doc	0.0d
char	2 Byte	[A, B, C…]	'\u0000'
boolean	1 Byte	[True, False]	False

Non-Primitive Data type:

Non- Primitive data types refer to objects and hence they are called Reference Data types. Objects can be accessed through reference data types. Example of non-primitive data types includes String, Array, Classes, and Interface, etc.

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