Data Types and Keyword in Java

 Data Types in JAVA

• It is a type of data which is used in the program.
• There are many predefined data types in java library like int,char,float etc.

Type of Data Type

Primitive Data Type

• The data type which is predefined in the library is called primitive data type.
• It is named by a keyword for example int,float,char etc.
• There are eight primitive data types in java.
  byte, short, int, long, float, double, boolean and char.

Integer Type

Type	Size in bytes	Range
byte	1	-128 to 127
short	2	-32,768 to 32,767
int	4	-2,147,483,648 to 2,147,483,647
long	8	-9,223,372,036,854,775,808 to 9,223.372,036,854,775,808

Float Type

Type	Size in bytes	Range
float	4	3.4e-038 to 3.4e+038.
double	8	1.7e-308 to 1.7e+038.

Boolean

Keyword	boolean
Syntax	boolean x;
Value	True/False
Default	False

Character

Keyword	char
Syntax	char x;
Value	'a','@','9'
Range	0 to 65536

Non-primitive Data Type

• The data type which is derived from primitive data type is called non-primitive data type.
• It is also called reference data type.
• They don't store the value, but store a reference to that value.
• Example:Array,class,interface etc.

• The word which is pre-defined in the library is called keyword.
• It's functionality is also pre-defined.
• Keyword can not be used as a variable, function name ,class name or as an any identifier.
• Example of keywords are int,float,char,void,main etc.

List of keywords in Java

char	continue	double	else
default	catch	finally	final
long	interface	int	instanceof
assert	abstract	class	extends
implements	float	const	boolean
private	public	protected	package
break	byte	case	do
enum	for	goto	if
import	native	new	return
strictfp	synchronized	static	short
super	switch	this	throw
throws	transient	try	void
volatile	while

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