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Java.io.SequenceInputStream in Java - GeeksforGeeks

Last Updated : 11 Sep, 2023

The SequenceInputStream class allows you to concatenate multiple InputStreams. It reads data of streams one by one. It starts out with an ordered collection of input streams and reads from the first one until end of file is reached, whereupon it reads from the second one, and so on, until end of file is reached on the last of the contained input streams.

• SequenceInputStream(Enumeration e) : Initializes a newly created SequenceInputStream , which must be an Enumeration that produces objects whose type is InputStream.
• SequenceInputStream(InputStream s1, InputStream s2) : Initializes a newly created SequenceInputStream by remembering the two arguments, which will be read in order, first s1 and then s2.

• read :Reads the next byte of data from this 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 - if an I/O error occurs.
  

• read(byte[] b, int off, int len) : Reads up to len bytes of data from this input stream into an array of

  Syntax:
  public int read(byte[] b,
         int off,
         int len)
           throws IOException
  Overrides: read in class InputStream
  Parameters:
  b - the buffer into which the data is read.
  off - the start offset in array b at which the data is written.
  len - the maximum number of bytes read.
  Returns: int the number of bytes read.
  Throws:
  NullPointerException - If b is null.
  IndexOutOfBoundsException - If off is negative, len is negative, 
  or len is greater than b.length - off
  IOException - if an I/O error occurs.

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

  Syntax :
  public int available()
                throws IOException 
  Overrides: available in class InputStream
  Returns:an estimate of the number of bytes that can be read (or skipped over) 
  from the current underlying input stream without blocking or 0 if this input stream
  has been closed by invoking its close() method
  Throws:
  IOException - if an I/O error occurs.

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

  Syntax :
  public void close()
             throws IOException
  Overrides: close in class InputStream
  Throws:
  IOException - if an I/O error occurs.

The following is an example of SequenceInputStream class that implements some of the important methods.

//Java program to demonstrate SequenceInputStream
import java.io.*;
import java.util.*;

class SequenceISDemp
{
    public static void main(String args[])throws IOException
    {

        //creating the FileInputStream objects for all the following files
        FileInputStream fin=new FileInputStream("file1.txt");
        FileInputStream fin2=new FileInputStream("file2.txt");
        FileInputStream fin3=new FileInputStream("file3.txt");

        //adding fileinputstream obj to a vector object
        Vector v = new Vector();
        
        v.add(fin);
        v.add(fin2);
        v.add(fin3);
        
        //creating enumeration object by calling the elements method
        Enumeration enumeration = v.elements();

        //passing the enumeration object in the constructor
        SequenceInputStream sin = new SequenceInputStream(enumeration);
        
        // determine how many bytes are available in the first stream
        System.out.println("" + sin.available());
        
        // Estimating the number of bytes that can be read 
        // from the current underlying input stream 
        System.out.println( sin.available());
        
        int i = 0;
        while((i = sin.read())! = -1)
        {
            System.out.print((char)i);
        }
        sin.close();
        fin.close();
        fin2.close();
        fin3.close();
    }
}

19
This is first file This is second file This is third file

Note: This program will not run on online IDE as there are no files associated with it.

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