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  • BufferedInputStream in java

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    Answer it

    How internally BufferedInputStream work in java?
    During read from a file, how or who bring bytes from the file to the internal buffer?
    Wether BufferedInputStream read 1 byte at a time from internal buffer?

 1 Answer(s)

  • public native int read() throws IOException;
    

    This is a native call to the OS which uses the disk to read the single byte. This is a heavy operation.

    For BufferedInputStream, the method delegates to an overloaded read() method that reads 8192 amount of bytes and buffers them until they are needed. It still returns only the single byte (but keeps the others in reserve). This way the BufferedInputStream makes less native calls to the OS to read from the file.

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