Basic Java Data Types

Primitive Data Types :
They are variables which are built into the system. Note that they are not objects.
Having to declare a variable of a specific primitive data types it would always hold the value of the data type. For example, if you were to declare a as a float, a would always be holding a float value.There's a list of eight independent primitive data types in java shown in table below.

Keyword	Description	Size
byte	Byte-size integer	8-bit
short	Short integer	16-bit
int	Integer	32-bit
long	Long integer	64-bit
char	Single character	16-bit
float	Single-precision floating point	32-bit
double	Double-precision floating point	64-bit
boolean	True or false	1-bit

Literals :
Literals specifies a specific data value. You can easiily manipulate the datas - whatever things you assign to a variable that is what you get. For example, 8 is typically an int value. However you can assign this as a double and it would be treated as a double.

Literal	Data Type
27, 027,0x1c	int
100L	long
45.0D , 27.0e3	double
99.0F	float
'B'	char
true /false	boolean
null	null object reference

Mathematical Operators:

Operator	Description
+	Addition
-	Subtraction
*	Multiplication
/	Division
%	Modulus (division remainder)

(Note :

- Modulus operator works by dividing the number on the left side by the number on the right side evenly and giving the remainder. For example; if you were to divide 9 by 2 , it gives you the remainder 1

-Just like mathematics,operator precedence takes place whenever you use these mathematical operators. It determines the order in which operations are applied to numbers.(eg: *,/,% have precedence over + and -)