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 *
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import java.io.*;

/**
 * When using the Externalizable Interface, an externalizable object
 * must implement a writeExternal method to save the state of the object.
 * It must also explicitly coordinate with its supertype to save its state.

 * This simple example shows how to do this for an object whose supertype
 * is also externalizable.
 *
 *  How to Run:
 *             Compile the file:  javac Savesuper.java
 *             Then run: java Savesuper.java
 *
 * This should print out a book object before and after serialization.
 *
 * Tested and compiled on JDK 1.1 & the Java 2 SDK, v1.2
 */

public class Savesuper {

    /**
     * Create an Book (subclass of reading material) object, serialize it,
     * deserialize it and see that they are the same. So, basically test that
     * this Externalizable example's works
     */
    public static void main(String args[]) {

        // create a Book object
        Book bookorg = new Book(100, "How to Serialize", true, "R.R", "Serialization", 97);
        Book booknew = null;

        //serialize the book
        try {
            FileOutputStream fo = new FileOutputStream("tmp");
            ObjectOutputStream so = new ObjectOutputStream(fo);
            so.writeObject(bookorg);
            so.flush();
        } catch (Exception e) {
            System.out.println(e);
            System.exit(1);
        }

        // de-serialize the Book
        try {
            FileInputStream fi = new FileInputStream("tmp");
            ObjectInputStream si = new ObjectInputStream(fi);
            booknew = (Book) si.readObject();
        }
        catch (Exception e) {
            System.out.println(e);
            System.exit(1);
        }

        /*
         * Print out the original and new book information
         * It should be the same if we did everything correctly!
         */
        System.out.println();
        System.out.println("Printing original book...");
        System.out.println(bookorg);
        System.out.println("Printing new book... ");
        System.out.println(booknew);
        System.out.println("Both original and new should be the same!");
        System.out.println();
    }
}