1.A primitive data type specifies the size and type of variable values.

2.A primitive type is predefined by the language and is named by a reserved keyword. Primitive values do not share state with other primitive values.(TDB).

There are eight primitive data types

• boolean data type
• byte data type
• char data type
• short data type
• int data type
• long data type
• float data type
• double data type

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

REFERENCE:

https://www.w3schools.com/java/java_data_types.asp

https://www.edureka.co/blog/data-types-in-java/

Java Data Types – Primitive & Non-Primitive Data types with Examples