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  • Difficulty Level : Basic
  • Last Updated : 24 Jan, 2017 class in Java class implements a buffered output stream. By setting up such an output stream, an application can write bytes to the underlying output stream without necessarily causing a call to the underlying system for each byte written.

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  • protected byte[] buf: The internal buffer where data is stored.
  • protected int count: The number of valid bytes in the buffer.

Constructor and Description

  • BufferedOutputStream(OutputStream out) : Creates a new buffered output stream to write data to the specified underlying output stream.
  • BufferedOutputStream(OutputStream out, int size) : Creates a new buffered output stream to write data to the specified underlying output stream with the specified buffer size.


  • void flush() : Flushes this buffered output stream.
    Syntax :public void flush()
               throws IOException
    flush in class FilterOutputStream
  • void write(byte[] b, int off, int len) : Writes len bytes from the specified byte array starting at offset off to this buffered output stream.
    Syntax :
    b - the data.
    off - the start offset in the data.
    len - the number of bytes to write.
  • void write(int b) : Writes the specified byte to this buffered output stream.
    Syntax :
    b - the byte to be written.


//Java program demonstrating BufferedOutputStream
class BufferedOutputStreamDemo
    public static void main(String args[])throws Exception
        FileOutputStream fout = new FileOutputStream("f1.txt");
        //creating bufferdOutputStream obj
        BufferedOutputStream bout = new BufferedOutputStream(fout);
        //illustrating write() method
        for(int i = 65; i < 75; i++)
        byte b[] = { 75, 76, 77, 78, 79, 80 };
        //illustrating flush() method
        //illustrating close() method

Output :


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