Data types in Java

Not everything in Java is an object. There is a special group of data types (also known as primitive types) that will be used quite often in programming. For performance reasons, the designers of the Java language decided to include these primitive types. Java determines the size of each primitive type. These sizes do not change from one operating system to another. This is one of the key features of the language that makes Java so portable. Java defines eight primitive types of data: byte, short, int, long, char, float, double, and boolean.

1) primitive data types
2) non-primitive data types

Types	Size	Default	Range	Example
boolean	1 bit	false	NA	boolean b = true;
Char	16 bits	\u0000	\u0000 to \uFFFF	char c = 'A';
Byte	8 bits	0	-128 to 127	byte b = 60;
Short	16 bits	0	-32768 to 32767	short  s = 60;
Int	32 bits	0	-2147483648 to 2147483647	int i = 60;
long	64 bits	0	-9223372036854775808 to 9223372036854775807	long l = 60L;
float	32 bits	0.0	±1.4E-45 to ±3.4028235E+38	float  f = 60f;
double	64 bits	0.0	±4.9E-324 to ±1.7976931348623157E+308	double d = 60.55;