Data types in Java

The data types in Java are divided into basic data types and reference data types, basically branching structure as follows:

Java Data type:

Basic data type:

Numeric type:

Integer type: Byte:8 bit, data range -128~127, wrapper class: Java.lang.Byte

Short:16 bit, data range -32768~32767, wrapper class: Java.lang.Short

Int:32 bit, data range (negative 2 of 31 square to positive 2 of 31 times minus 1), Packing class: Java.lang.Integer

long:64 bit, data range (negative 2 of 64 square to positive 2 of 64 times minus 1), Packing class: Java.lang.Long

Floating-point type: float:32 bit, data Range ( ieeee 754 single precision ), Wrapper class: Java.lang.Float, the direct assignment must be preceded by a number F or F, the default value is 0.0f/f

double:64 bit, data range ( max. IEEE 754 Double precision ), wrapper class: Java.lang.Double, can be added D or D when assigned, and can not be added, default value 0.0

Non-numeric type:

Character type: char:16 bit, storing Unicode code, assigning value with single quotation mark, wrapper class: Java.lang.Character, when the variable is initialized, the default value is ' u0000 '

Boolean type: Boolean:1 bit, only true and false two states, initialized to False

Reference data type:

Class, interface, array, enumeration,

Data types in Java