IO flow principle and classification

IO Flow principle and classification

• Java IO Flow principle

  • I/O yes Input/Output Abbreviation ,I/O Technology is a very practical technology , Used to handle data transmission . As read / Writing documents , Network communication, etc .

  • Java In the program , For data input / Output operation to “ flow (stream)” By .

  • java.io A variety of “ flow ” Classes and interfaces , To get different kinds of data , And input or output data through methods .

  • Input input： Read external data （ disk 、 Data from storage devices such as optical disks ） To the program （ Memory ） in

  • Output output: Put the program （ Memory ） Data output to disk 、 CD and other storage devices

• Classification of flows

  • According to the operation data unit, it can be divided into ： Byte stream （8 bit）, Character stream （ By character , Corresponding to several bytes ）

  • According to the direction of data flow, it can be divided into ： Input stream , Output stream

  • According to the different roles of flow, it can be divided into ： Node flow , Processing flow / Packaging flow

Abstract base class	Byte stream	Character stream
Input stream	InputStream	Reader
Output stream	OutputStream	Writer

• • Java Of IO Current co involved 40 Multiple classes , It's actually very regular , All from the above 4 Derived from an abstract base class

  • The subclass names derived from these four classes are all suffixed with their parent class names