What are the commonly used data types in java

Data types in Java are divided into basic data types and reference data types.

Basic data types

1. 4 integer types

byte 1 byte -128——127

short 2 bytes -32,768 —— 32,767

int 4 bytes ——2,147,483,648 ——2,147,483,647 (more than 2 billion)

long 8 bytes -9,223,372,036,854,775,808——9,223,372,036854 ,775,807

Note: The number of bytes occupied by all data classes in Java has nothing to do with the platform, and Java does not have any unsigned types

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2. Two floating point types

float 4 bytes Single precision (significant digits 6 – 7 digits)

double 8 bytes Double precision (15 significant digits)

3. 1 Unicode encoded character unit

char 2 bytes The entire Unicode character set

4. 1 A Boolean type

boolean 1 bit True or false

Reference data type

1. Class class

2. Interface interface

3. Array array

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