Data Types

Data Type	Size	Primitive/Reference	Value
boolean	1 bit	primitive	true or false
byte	1 byte	primitive	-128 to 127
short	2 bytes	primitive	-32,768 to 32,767
int	4 bytes	primitive	-2 billion to 2 billion
long	8 bytes	primitive	-9 quintillion to 9 quintillion
float	4 bytes	primitive	fractional number up to 6-7 digits (e.g., 3.141592f)
double	8 bytes	primitive	fractional number up to 15 digits (e.g., 3.141592653589793)
char	2 bytes	primitive	single character/letter/ASCII value (e.g., ‘f’)
String	varies	reference	a sequence of characters (e.g., “Hello world!“)

Note

If u need to assign value to float data type u need to add f at end of the number, but not in double

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Primitive vs Reference Data Types

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