TYPES | Notion

Primitive: For Storing simple values

TYPE	BYTES	RANGE
Byte	1	-128 to 127
Short	2	-32,768 to 32,767
Integer	4	-2,147,483,648 to 2,147,483,647
Long	8	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
Float	4	1.2E-38 to 3.4E+38
Double	8
Char	1	A, B, C….
Boolean	1	true or false

NOTE: While initialising for float and long, we need to type “f” and "L,” respectively.

CONSTANTS

Once they are declared, they cannot change in the future.
SYNTAX: final datatype name;
We use “final” before Data Type to declare it as a constant.

Reference: For storing complex objects

Reference types don't store the actual values; they store a reference to an object somewhere in memory.

These are created using a “new” keyword.