Java.io.ObjectInputStream.readObjectOverride() Method

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Description

The java.io.ObjectInputStream.readObjectOverride() method is called by trusted subclasses of ObjectOutputStream that constructed ObjectOutputStream using the protected no-arg constructor. The subclass is expected to provide an override method with the modifier "final".

Declaration

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

protected Object readObjectOverride()

Parameters

  • NA

Return Value

This method returns the Object read from the stream.

Exception

  • ClassNotFoundException -- Class of a serialized object cannot be found.

  • OptionalDataException -- Primitive data was found in the stream instead of objects.

  • IOException -- if I/O errors occurred while reading from the underlying stream

Example

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

package com.tutorialspoint;

import java.io.*;

public class ObjectInputStreamDemo extends ObjectInputStream{

   public ObjectInputStreamDemo(InputStream in) throws IOException {
        super(in);
    }
   public static void main(String[] args) {

      String s = "Hello World";
      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.writeObject(s);
         oout.flush();

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

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


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

   }
}

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

Hello World



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