Blip1.java Source code

Introduction

Here is the source code for Blip1.java

Source

// : c12:Blips.java
// Simple use of Externalizable & a pitfall.
// {Clean: Blips.out}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.io.Externalizable;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;

class Blip1 implements Externalizable {
    public Blip1() {
        System.out.println("Blip1 Constructor");
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        System.out.println("Blip1.writeExternal");
    }

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        System.out.println("Blip1.readExternal");
    }
}

class Blip2 implements Externalizable {
    Blip2() {
        System.out.println("Blip2 Constructor");
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        System.out.println("Blip2.writeExternal");
    }

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        System.out.println("Blip2.readExternal");
    }
}

public class Blips {
    // Throw exceptions to console:
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        System.out.println("Constructing objects:");
        Blip1 b1 = new Blip1();
        Blip2 b2 = new Blip2();
        ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("Blips.out"));
        System.out.println("Saving objects:");
        o.writeObject(b1);
        o.writeObject(b2);
        o.close();
        // Now get them back:
        ObjectInputStream in = new ObjectInputStream(new FileInputStream("Blips.out"));
        System.out.println("Recovering b1:");
        b1 = (Blip1) in.readObject();
        // OOPS! Throws an exception:
        //! System.out.println("Recovering b2:");
        //! b2 = (Blip2)in.readObject();
    }
} ///:~