Overview and classification of basic Java language data types

Why are there data types

The Java language is a strongly typed language that defines specific data types for each data.

Different sizes of space are allocated in memory

Classification of data types in Java

Basic data types

Reference data type

Basic data type Classification (class 4, type 8)

Integer type

Byte occupies one byte

Short occupies two bytes

int occupies four bytes

A long occupies eight bytes

Floating point Type

Float occupies four bytes

Double takes eight bytes

Boolean type

Boolean

Theoretically occupies one-eighth bytes, but Java does not explicitly specify his dih

1 classDemo1_datatype {2      Public Static voidmain{3 4         byteb =10;5          Shorts = 20;6         Longx = 40;7         Longx = 88888888L;//The default value is int, and the range of values above int will be error, plus L or l8         floatf = 1.2f;9         DoubleD = 5.4;//the default type for decimals is double, and float is followed by F or FTen      One System.out.println (b); A System.out.println (s); - System.out.println (i); - System.out.println (x) the  -}

Overview and classification of basic Java language data types