What is io stream in java

What is an io stream in java

A stream is a set of sequential words with a starting point and an end point. Section collection is a general term or abstraction for data transmission. That is, the transmission of data between two devices is called a stream.

java IO stream is mainly used for data transmission. The stream is abstracted into various classes according to the data transmission characteristics to facilitate more intuitive data operations. (Recommended tutorial: java tutorial)

Java I/O mainly includes the following levels, including three parts:

1. Streaming part - the main part of IO;

2. Non-streaming part - mainly includes some classes that assist the streaming part, such as: File class, RandomAccessFile class and FileDescriptor class;

3. Other classes - security-related classes in the file reading part, such as: SerializablePermission class, and file system classes related to the local operating system, such as: FileSystem class, Win32FileSystem class and WinNTFileSystem class.

The main categories are as follows:

1. File (file characteristics and management): used for description information of files or directories, such as generating new directories and modifying file names. , delete files, determine the path of the file, etc.

2. InputStream (binary format operation): abstract class, byte-based input operation, and is the parent class of all input streams. Defines common characteristics that all input streams have.

3. OutputStream (binary format operation): abstract class. Byte-based output operations. Is the parent class of all output streams. Defines common characteristics that all output streams have.

4.Reader (file format operation): abstract class, character-based input operation.

5. Writer (file format operation): abstract class, character-based output operation.

6. RandomAccessFile (random file operation): an independent class, directly inherited from Object. It has rich functions and can perform access (input and output) operations from any location in the file.

Classification of IO streams:

a) According to the different types of data processed, they are divided into: character stream and byte stream;

b) According to Data flow directions are divided into: input stream and output stream.

c) Classification by data source (destination):

1. File (file): FileInputStream, FileOutputStream, FileReader, FileWriter

2. byte[]: ByteArrayInputStream, ByteArrayOutputStream

3. Char[]: CharArrayReader,CharArrayWriter

4. String:StringBufferInputStream, StringReader, StringWriter

5. Network data stream: InputStream, OutputStream, Reader, Writer

For example:

For example, the pipe of your faucet is a flow: the flow is divided into input and output flows, and the input flow is the water pumped from the reservoir by your faucet. The other end (FileInputStream: pumps water into the pipe), and the output stream is the end where your faucet flows to your large water tank (FileOutputStream: flows water into the tank).

Now there is an A.txt file. If you want to read the information in it, it is equivalent to pumping water from the reservoir to the pipe (FileInputStream), and then write it to another file (FileOutputStream) after reading it. , which is equivalent to the faucet pumping water and then flowing it to the large water tank. It's very simple. It's just a matter of going in and out. It's not that complicated.

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