/**
 * Title: SerializePlay
 * Description: Using Serializable interface and ObjectStreams
 * @author hollingd@cs.rpi.edu
 */

import java.io.*;

// a base class that includes a couple of fields

abstract class Base implements Serializable {
    int x;
    String name;

    Base() {
	x=0;
	name="noname";
    }

    Base(int i, String s) {
	x=i;
	name=s;
    }
}


// a derived class that adds a new field and is serializable

class Foo extends Base implements Serializable{

    String fooString;

    Foo() {
	super();
	fooString="nofoostring";
    }

    Foo( int x, String n, String f) {
	super(x,n);
	fooString=f;
    }

    public String toString() {
	return "Foo:\n\tx: " + x + "\n\t" +
	    "Name: " + name + "\n\t" +
	    "FooString: " + fooString + "\n";
    }
}


// a main and a couple of methods for playing with 
// serializeable objects. 
public class SerializeArray {

    static public void main(String []args)
	throws IOException,ClassNotFoundException{
	// probably want to comment out one of these for testing
	//write();
	read();
    }

    // write() generates a list of 5 Foo objects and then writes
    // them to the file named "save" (as Objects)

    static public void write() throws IOException,ClassNotFoundException{
	Foo[] f = new Foo[5];

	for (int i=0;i<5;i++) {
	    f[i] = new Foo(i,"my name is " + Integer.toString(i), "Foo # " + i);
	}

	for (int i=0;i<5;i++) {
	    System.out.println(f[i]);
	}

	// create an ObjectOutputStream associated with the file "save"
	ObjectOutputStream dos = new ObjectOutputStream(
							new FileOutputStream("save"));
	dos.writeObject(f);
	dos.close();
	System.out.println("Done");
    }


    // read() reads 5 Foo objects from the file "save"
    // and prints them out.

    static public void read() throws IOException,ClassNotFoundException{
	ObjectInputStream ois = new ObjectInputStream(
						      new FileInputStream("save"));

	Foo[] blah = (Foo[]) ois.readObject();
	// print out the ones we got
	for ( int i=0;i<blah.length;i++) {
	    System.out.println(blah[i]);
	}

    }
}