Java Data Types

 int myNum = 5;                        // Integer number

float  myFloatNum = 5.99f      // Floating number

char  myLetter = 'N'                // Character

boolean myBool = True;        // Boolean

String myText = "Hello";      // string

Data types are divided into two groups :

• Primitive data type - includes byte, short, int, long, float, double, boolean and char
• non-primitive data type - such as string, arrays and classes.

Primitive Data Types

A Primitive data type specifies the size and type of valiable values, and it has no additional methods.

There are eight primitive data types in java:

byte  -   1 byte

description : stores whole numbers from -128 to 127

short -   2 bytes

stores whole numbers from -32,768 to 32,767

int  -    4 bytes

stores whole numbers from -2,147,483,6478 to 2,247,483,647

long  -  8 bytes

stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807

float -   4 bytes

Stores fractional number. Sufficient for storing 6 to 7 decimal digits

boolean   -   1 bit

stores true or false values

char  -   2 bytes

stores a single character/letter or ASCII values.