Java.io.ObjectInputStream.available() Method

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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