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Java.io.BufferedInputStream class in Java - GeeksforGeeks

Last Updated : 23 Jul, 2025

A BufferedInputStream adds functionality to another input stream-namely, the ability to buffer the input and to support the mark and reset methods. When the BufferedInputStream is created, an internal buffer array is created. As bytes from the stream are read or skipped, the internal buffer is refilled as necessary from the contained input stream, many bytes at a time.

• BufferedInputStream(InputStream in) : Creates a BufferedInputStream and saves its argument, the input stream in, for later use.
• BufferedInputStream(InputStream in, int size) : Creates a BufferedInputStream with the specified buffer size, and saves its argument, the input stream in, for later use.

• int available() : Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream.

  Syntax:public int available()
                throws IOException
  Returns:
  an estimate of the number of bytes that can be 
  read (or skipped over) from this input stream without blocking.
  Throws:
  IOException
  

• void close() : Closes this input stream and releases any system resources associated with the stream.

  Syntax:public void close()
             throws IOException
  Overrides:
  close in class FilterInputStream
  Throws:
  IOException 
  

• void mark(int readlimit) : Marks the current position in this input stream.

  Syntax:public void mark(int readlimit)
  Overrides:
  mark in class FilterInputStream
  Parameters:
  readlimit - the maximum limit of bytes that can be read 
  before the mark position becomes invalid.
  

• boolean markSupported() : Tests if this input stream supports the mark and reset methods.

  Syntax:public boolean markSupported()
  Overrides:
  markSupported in class FilterInputStream
  Returns:
  a boolean indicating if this stream type supports the mark and reset methods.
  

• int read() : Reads the next byte of data from the input stream.

  Syntax:public int read()
           throws IOException
  Returns:
  the next byte of data, or -1 if the end of the stream is reached.
  Throws:
  IOException 
  

• int read(byte[] b, int off, int len) : Reads bytes from this byte-input stream into the specified byte array, starting at the given offset.

  Syntax:public int read(byte[] b,
         int off,
         int len)
           throws IOException
  Parameters:
  b - destination buffer.
  off - offset at which to start storing bytes.
  len - maximum number of bytes to read.
  Returns:
  the number of bytes read, or -1 if the end of the stream has been reached.
  Throws:
  IOException 
  

• void reset() : Repositions this stream to the position at the time the mark method was last called on this input stream.

  Syntax:public void reset()
             throws IOException
  Overrides:
  reset in class FilterInputStream
  Throws:
  IOException
  

• long skip(long n) :Skips over and discards n bytes of data from this input stream

  Syntax:public long skip(long n)
            throws IOException
  Parameters:
  n - the number of bytes to be skipped.
  Returns:
  the actual number of bytes skipped.
  Throws:
  IOException

// Java program to demonstrate working of BufferedInputStream
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;

// Java program to demonstrate BufferedInputStream methods
class BufferedInputStreamDemo
{
    public static void main(String args[]) throws IOException
    {
        // attach the file to FileInputStream
        FileInputStream fin = new FileInputStream("file1.txt");

        BufferedInputStream bin = new BufferedInputStream(fin);

        // illustrating available method
        System.out.println("Number of remaining bytes:" +
                                            bin.available());

        // illustrating markSupported() and mark() method
        boolean b=bin.markSupported();
        if (b)
            bin.mark(bin.available());

        // illustrating skip method
        /*Original File content:
        * This is my first line
        * This is my second line*/
        bin.skip(4);
        System.out.println("FileContents :");

        // read characters from FileInputStream and
        // write them
        int ch;
        while ((ch=bin.read()) != -1)
            System.out.print((char)ch);

        // illustrating reset() method
        bin.reset();
        while ((ch=bin.read()) != -1)
            System.out.print((char)ch);

        // close the file
        fin.close();
    }
}

Output:

Number of remaining bytes:47
FileContents :
 is my first line
This is my second line
This is my first line
This is my second line

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