What is the classification of people like Java IO?
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According to the flow direction, it is divided into input stream and output stream:
Note that the input stream and output stream are relative to the program.
Output: output the contents of the program (memory) to disk, CD and other storage devices
Input: read external data (data from disks, CDs, etc.) into the program (memory)
To sum up:
Second, according to the transmission data unit, it is divided into byte stream and character stream.
The above are also the four base streams in the Java IO stream. These four base streams are abstract classes, and the other streams inherit from these four base streams.
Third, according to the function, it is divided into node flow and packaging flow.
Node flow: you can read and write data from or to a specific place (node). Such as FileReader.
Processing flow: it is the connection and encapsulation of an existing stream, and the data is read and written through the function call of the encapsulated stream. Such as BufferedReader. The constructor of the processing flow always takes another stream object as a parameter. A stream object is wrapped multiple times by other streams and is called a link to the stream.
The template for manipulating the IO stream:
①, create source or destination object
Input: flow the data from the file to the program, where the file is the source and the program is the target
Output: flow the data from the program to the file, where the file is the target and the program is the source
②, create IO stream object
Input: creating input stream object
Output: creating output stream object
③, specific IO operation
④, close resources
Input: close () method of the input stream
Output: close () method of the output stream
Note: 1. The file IO resource opened in the program does not belong to the resource in memory, and the garbage collection mechanism cannot recycle the resource. If you do not close the resource, the file on the disk will always be referenced by the program and cannot be deleted or changed. So you should manually call the close () method to close the stream resource.
Finally, this is the overall architecture of the Java IO streams, which will be explained in more detail in the following blogs:
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