PersonExt.java Source code

Introduction

Here is the source code for PersonExt.java

Source

import java.io.Externalizable;
import java.io.File;
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 PersonExt implements Externalizable {
    private String name = "Unknown";
    private String gender = "Unknown";
    private double height = Double.NaN;

    public PersonExt() {
    }

    public PersonExt(String name, String gender, double height) {
        this.name = name;
        this.gender = gender;
        this.height = height;
    }

    public String toString() {
        return "Name: " + this.name + ", Gender:   " + this.gender + ",  Height: " + this.height;
    }

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        this.name = in.readUTF();
        this.gender = in.readUTF();
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeUTF(this.name);
        out.writeUTF(this.gender);
    }
}

public class Main {
    public static void main(String[] args) {
        PersonExt p1 = new PersonExt("John", "Male", 6.7);
        PersonExt p2 = new PersonExt("Wally", "Male", 5.7);
        PersonExt p3 = new PersonExt("Katrina", "Female", 5.4);

        File fileObject = new File("personext.ser");

        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(fileObject))) {
            oos.writeObject(p1);
            oos.writeObject(p2);
            oos.writeObject(p3);

            System.out.println(p1);
            System.out.println(p2);
            System.out.println(p3);
        } catch (IOException e1) {
            e1.printStackTrace();
        }

        fileObject = new File("personext.ser");

        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(fileObject))) {

            p1 = (PersonExt) ois.readObject();
            p2 = (PersonExt) ois.readObject();
            p3 = (PersonExt) ois.readObject();

            // Let's display the objects that are read
            System.out.println(p1);
            System.out.println(p2);
            System.out.println(p3);

            // Print the input path
            System.out.println("Objects were  read   from  " + fileObject.getAbsolutePath());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}