MainClass.java Source code

Introduction

Here is the source code for MainClass.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;

public class MainClass {

    public static void main(String[] args) throws IOException, ClassNotFoundException {
        System.out.println("Constructing objects:");
        MyBean myBean = new MyBean("A String ", 47);
        System.out.println(myBean);
        ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("MyBean.out"));
        System.out.println("Saving object:");
        o.writeObject(myBean);
        o.close();

        ObjectInputStream in = new ObjectInputStream(new FileInputStream("MyBean.out"));
        System.out.println("Recovering:");
        myBean = (MyBean) in.readObject();
        System.out.println(myBean);
    }
}

class MyBean implements Externalizable {
    private int i;

    private String s; // No initialization

    public MyBean() {
        System.out.println("MyBean Constructor");
        // s, i not initialized
    }

    public MyBean(String x, int a) {
        System.out.println("MyBean(String x, int a)");
        s = x;
        i = a;
        // s & i initialized only in nondefault constructor.
    }

    public String toString() {
        return s + i;
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        System.out.println("MyBean.writeExternal");
        out.writeObject(s);
        out.writeInt(i);
    }

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        System.out.println("MyBean.readExternal");
        s = (String) in.readObject();
        i = in.readInt();
    }

}

/**/