A.java Source code

Introduction

Here is the source code for A.java

Source

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

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

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

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

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

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

public class MainClass {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        System.out.println("Constructing objects:");
        A b1 = new A();
        B b2 = new B();
        ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("File.out"));
        System.out.println("Saving objects:");
        o.writeObject(b1);
        o.writeObject(b2);
        o.close();

        ObjectInputStream in = new ObjectInputStream(new FileInputStream("File.out"));
        System.out.println("Recovering b1:");
        b1 = (A) in.readObject();
    }
}
/*
*/