Java eight Big data types

There are eight Java basic data types, and the basic types can be divided into three categories: Character type char, Boolean type Boolean, and numeric type byte,short,int,long,float,double. Numeric types can also be classified as integer-type Byte,short,int,long and floating-point data type float,double. There are no unsigned numeric types in Java, their range is fixed and will not change with their hardware environment or operating system. In fact, there is another data type Void in Java, which also has a corresponding wrapper class java.lang.Void, but we cannot manipulate them directly.

define the simple type, occupy bits number and corresponding wrapper class diagram:

Simple Type	Boolean	Byte	Char	Short	Int	Long	Float	Double	void
Number of binary digits	1	8	16	16	32	64	32	64	--
Wrapper class	Boolean	Byte	Character	Short	Integer	Long	Float	Double	Void

Basic types of benefits: Data storage is relatively simple, efficient operation

The advantages of packaging class: some easy. For example, the element of a collection must be an object type, satisfying the idea that everything in Java is an object

2018-05-10 09:28:59

Java eight Big data types