Java Fundamentals: The concept and classification of data types

Data type:

The Java language is a strongly typed language that defines specific data types for each type of data, and allocates a different size of memory space in memory

Classification of data types:

Basic data type:

Integer:

Number of bytes occupied

byte	1
short	2
int	4
Long	8

Floating point number:

float	4
Double	8

Character:

Char

2

Boolean:

Boolean

1

Attention:

Integers by default are of type int

Float type default is double type

When you define a long type, the value is at the end and L or L

Reference data type (class, interface, numeric)

 

Java Fundamentals: The concept and classification of data types