Java.io.BufferedOutputStream class in Java

Java.io.BufferedInputStream class in Java

Java.io.BufferedOutputStream 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.

Fields

• 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.

Methods:

• void flush() : Flushes this buffered output stream.

  Syntax :public void flush()
             throws IOException
  Overrides:
  flush in class FilterOutputStream
  Throws:
  IOException
  

• 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 :
  Parameters:
  b - the data.
  off - the start offset in the data.
  len - the number of bytes to write.
  Throws:
  IOException
  

• void write(int b) : Writes the specified byte to this buffered output stream.

  Syntax :
  Parameters:
  b - the byte to be written.
  Throws:
  IOException
  

Program:

//Java program demonstrating BufferedOutputStream

import java.io.*;

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++)
        {
            bout.write(i);
        }

        byte b[] = { 75, 76, 77, 78, 79, 80 };
        bout.write(b);

        //illustrating flush() method
        bout.flush();

        //illustrating close() method
        bout.close();
        fout.close();
    }
}

Output :

ABCDEFGHIJKLMNOP

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