reference and primitive type in java code example

Example 1: how to check type of primitive value in java

int i = 20;
float f = 20.2f;
System.out.println(((Object)i).getClass().getName());
System.out.println(((Object)f).getClass().getName());

Example 2: primitive and non primitive data types in java

Primitive data types are those data types which are used by programmers when creating variables in their program. 
For example :-
    * boolean
    * char
    * byte
    * short
    * int
    * long
    * float
    * double
Non-Primitive data types:
    * String
    * array
    * enum
    * class
    * etc

Example 3: primitive data types in java

/* 
	Java Data Types
There 2 Types Of Data Types In Java
1) Primitive -> byte, char, short, int, long, float, double and boolean.
2) Non-primitive -> (All Classes) -> String, Arrays etc.

Type	Size	Stores
byte	1 byte	whole numbers from -128 to 127
short	2 bytes	"" -32,768 to 32,767
int	    4 bytes	"" -2,147,483,648 to 2,147,483,647
long	8 bytes	""-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
float	4 bytes	fractional numbers; for storing 6 to 7 decimal digits
double	8 bytes	fractional numbers; "" 15 ""
boolean	1 bit	true or false values
char	2 bytes	single character/letter or ASCII values
*/

Example 4: what are the primitive types java

Primitive types are the most basic data
types available within the Java language. 
Some of them are boolean , byte , char ,
short , int , long , float and double . 
These types serve as the building blocks
of data manipulation in Java.