Java.io.ObjectInputStream.available() Method

Description

The java.io.ObjectInputStream.available() method returns the number of bytes that can be read without blocking.

Declaration

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

public int available()

Parameters

• NA

Return Value

This method returns the number of available bytes.

Exception

• IOException -- if there are I/O errors while reading from the underlying InputStream

Example

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

package com.tutorialspoint;

import java.io.*;

public class ObjectInputStreamDemo {

   public static void main(String[] args) {

      try {

         // create a new file with an ObjectOutputStream
         FileOutputStream out = new FileOutputStream("test.txt");
         ObjectOutputStream oout = new ObjectOutputStream(out);

         // write something in the file
         oout.writeUTF("Hello World");
         oout.flush();

         // create an ObjectInputStream for the file we created before
         ObjectInputStream ois = 
		 new ObjectInputStream(new FileInputStream("test.txt"));

         // check how many bytes are available
         System.out.println("" + ois.available());
      } catch (Exception ex) {
         ex.printStackTrace();
      }

   }
}

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

13