Principles of using Java IO

First, according to the data source (whereabouts) Classification:

1, is the file: FileInputStream, FileOutputStream, (Byte stream) FileReader, FileWriter (character)

2, is byte[]: Bytearrayinputstream, Bytearrayoutputstream (Byte stream)

3, is char[]: CharArrayReader, Chararraywriter (character stream)

4, is String:stringbufferinputstream, Stringbufferouputstream (Byte stream) StringReader, StringWriter (character stream)

5, network Data flow: InputStream, OutputStream, (Byte stream) Reader, Writer (character stream)

Second, according to whether to format the output points:

1. To format the output: PrintStream, PrintWriter

Third, press whether to buffer points:

1, to buffer: Bufferedinputstream, Bufferedoutputstream, (Byte stream) BufferedReader, BufferedWriter (character stream)

Iv. by Data format:

1. binary format (as long as it cannot be determined to be plain text): InputStream, OutputStream and all subclasses with Stream end

2, plain text format (including pure English and Chinese characters or other encoding); reader, writer and all the subclasses of reader, writer

Five, according to the input and output points:

1. Input: Reader, subclass of InputStream type

2. Output: Writer, subclass of OutputStream type

Vi. Special Needs:

1. Conversion class from Stream to Reader,writer: InputStreamReader, OutputStreamWriter

2, object input and output: ObjectInputStream, ObjectOutputStream

3. Interprocess communication: Pipeinputstream, Pipeoutputstream, Pipereader, Pipewriter

4. Merge input: Sequenceinputstream

5, more special needs: Pushbackinputstream, Pushbackreader, Linenumberinputstream, LineNumberReader

The general guidelines for deciding which class to use and its construction process are as follows (regardless of special needs):

First, consider what the most primitive data format is: Principle Four

The second is the input or output: Principle five

Third, do you need to convert the flow: Principle Six 1th

What is the source of data (whereabouts): Principle One

Five, whether to buffer: principle Three (Special note: It is important to pay attention to the readLine () whether there is a definition, what is more than read, write a more special input or output method)

VI, do you want to format the output: Principle two

Principles of using Java IO