Java Data Types

A data type in Java represents the size and different values that can be stored in a variable. A Java data type is a set of values and operations defined on those values.

There are two types of data types in Java

• Non-primitive data types
• Primitive data types

1. Non-primitive data types : 

Non-primitive data types are as belows

• Arrays
• Classes

2. Primitive data types :

Primitive data types are as belows

• byte
• short
• int
• long
• float
• double
• boolean
• char

Data Type	Size	Stores Value
byte	1 byte	from -128 to 127
short	2 bytes	-32,768 to 32,767
int	4 bytes	-2,147,483,648 to 2,147,483,647
long	8 bytes	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
float	4 bytes	6 to 7 decimal digits
double	8 bytes	15 decimal digits
boolean	1 bit	true or false values
char	2 bytes	single character/letter or ASCII values

 

Syntax : 

data type variable [ = value][, variable [ = value] ...] ;

 

 

Example :

int p, q, r; // Declares three integer p, q, and r.
int l = 10, m = 10; // Example for initialization value
byte C = 22; // initializes a byte type variable C.
double a = 5.56; // declares and assigns a value of a.
char a = 'a'; // the char variable a its initialized with value 'a'