//: io/Blips.java

package io; /* Added by Eclipse.py */

// Simple use of Externalizable & a pitfall.

import java.io.*;

import static net.mindview.util.Print.*;

class Blip1 implements Externalizable {

public Blip1() {

print("Blip1 Constructor");

}

public void writeExternal(ObjectOutput out)

throws IOException {

print("Blip1.writeExternal");

}

public void readExternal(ObjectInput in)

throws IOException, ClassNotFoundException {

print("Blip1.readExternal");

}

}

class Blip2 implements Externalizable {

Blip2() {

print("Blip2 Constructor");

}

public void writeExternal(ObjectOutput out)

throws IOException {

print("Blip2.writeExternal");

}

public void readExternal(ObjectInput in)

throws IOException, ClassNotFoundException {

print("Blip2.readExternal");

}

}

public class Blips {

public static void main(String[] args)

throws IOException, ClassNotFoundException {

print("Constructing objects:");

Blip1 b1 = new Blip1();

Blip2 b2 = new Blip2();

ObjectOutputStream o = new ObjectOutputStream(

new FileOutputStream("Blips.out"));

print("Saving objects:");

o.writeObject(b1);

o.writeObject(b2);

o.close();

// Now get them back:

ObjectInputStream in = new ObjectInputStream(

new FileInputStream("Blips.out"));

print("Recovering b1:");

b1 = (Blip1)in.readObject();

// OOPS! Throws an exception:

//! print("Recovering b2:");

//! b2 = (Blip2)in.readObject();

}

} /* Output:

Constructing objects:

Blip1 Constructor

Blip2 Constructor

Saving objects:

Blip1.writeExternal

Blip2.writeExternal

Recovering b1:

Blip1 Constructor

Blip1.readExternal

*///:~