IO stream in Java, input and output stream, character byte stream
A stream is an abstraction that is responsible for the input and output of data. That is, the transfer of data between two devices is called a stream. The essence of a stream is data transfer. The classes that flow in Java are placed in the java.io package.
Streams can be divided into two types, byte stream and character stream, and the objects to be transferred are bytes and characters, respectively.
The flow directions according to different data can also be divided into an input stream and an output stream.
Both Inputstream (byte input stream) and Reader (character input stream) are read, which is equivalent to reading data from an external file into the program.
Both the Outputstream (byte output stream) and the Writer (character output stream) are written, which is equivalent to writing the data in the program to an external file.
Inputstream is the parent class of all byte input streams and is an abstract class for byte input streams.
Inputstream constructor and implementation method, as shown in Figure api
The Reader class is an abstract class for character input streams, which is the parent class for all character input streams.
The Outputstream is the parent of all byte output streams and is an abstract class for byte output streams.
The Writer class is an abstract class for character output streams, which is the parent class for all character output streams.
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