Java ObjectInputStream available() Method

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

Syntax

Parameter

Returns

The number of available bytes.

Throws

IOException

Example 1

import java.io.*;
public class ObjectInputStreamavailableExample1  {
     public static void main(String[] args) {
                  String str = "Hello";
                  byte[] barray = {'j', 'a', 'v', 'a', 'T', 'p', 'o', 'i', 'n', 't'};
                             try {
                          // create a new file with an ObjectOutputStream
                          FileOutputStream outstream = new FileOutputStream("file1.txt");
                          ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);
                    // writing objects str and barray to objectoutputstream
                          objoutstream.writeObject(str);
                          objoutstream.writeObject(barray);
                          
                         // create an ObjectInputStream for the file we created before
                         ObjectInputStream objinstream = new ObjectInputStream(new FileInputStream("file1.txt"));

                         // read and print an object and cast it as string
                         System.out.println("" + (String) objinstream.readObject());
                         System.out.println("" + objinstream.available());
        
                         byte[] read = (byte[]) objinstream.readObject();
                         String s2 = new String(read);
                         System.out.println("" + s2);
                        } catch (Exception ex) {
                                 ex.printStackTrace();
                               }
                 }
}

Output:

Hello
0
javaTpoint

Example 2

import java.io.*;
public class ObjectInputStreamavailableExample2  {
   public static void main(String[] args) {
      try {
            FileInputStream instream = new FileInputStream("file1.txt");
           ObjectInputStream objinstream = new ObjectInputStream(instream);
           String str=objinstream.toString();

           FileOutputStream outstream = new FileOutputStream("file2.txt");
           ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);

           // writing objects str and barray to objectoutputstream
           objoutstream.writeObject(str);
           objoutstream.flush();

          // create an ObjectInputStream for the file we created before
          ObjectInputStream objinstream2 = new ObjectInputStream(new FileInputStream("file2.txt"));

          // read and print an object and cast it as string
          System.out.println("" + (String) objinstream.readObject());

         // read and print an object and cast it as string
         byte[] read = (byte[]) objinstream.readObject();
         String s2 = new String(read);
        
         System.out.println("" + s2);
         System.out.println("" + objinstream2.available());
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
}

Output: