Java.io.SequenceInputStream.available() Method

Description

The java.io.SequenceInputStream.available() method 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. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.

Declaration

Following is the declaration for java.io.SequenceInputStream.available() method.

public int available()

Parameters

NA

Return Value

This method 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.

Exception

IOException − If an I/O error occurs.

Example

The following example shows the usage of java.io.SequenceInputStream.available() method.

package com.tutorialspoint;

import java.io.*;

public class SequenceInputStreamDemo {
   public static void main(String[] args) {

      // create two  new strings with 5 characters each
      String s1 = "Hello";
      String s2 = "World";

      // create 2 input streams
      byte[] b1 = s1.getBytes();
      byte[] b2 = s2.getBytes();
      ByteArrayInputStream is1 = new ByteArrayInputStream(b1);
      ByteArrayInputStream is2 = new ByteArrayInputStream(b2);

      // create a new Sequence Input Stream
      SequenceInputStream sis = new SequenceInputStream(is1, is2);
      
      try {
         // determine how many bytes are available in the first stream
         System.out.println("" + sis.available());
         
         // read 10 characters, 5 from each stream
         for (int i = 0; i < 10; i++) {
            char c = (char) sis.read();
            System.out.print("" + c);
         }

         // close the stream
         sis.close();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

5
HelloWorld