SerialCloneTest.java Source code

Introduction

Here is the source code for SerialCloneTest.java

Source

/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)
    
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
    
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
    
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
   @version 1.20 17 Aug 1998
   @author Cay Horstmann
*/

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Date;
import java.util.GregorianCalendar;

public class SerialCloneTest {
    public static void main(String[] args) {
        Employee harry = new Employee("Harry Hacker", 35000, 1989, 10, 1);
        // clone harry
        Employee harry2 = (Employee) harry.clone();

        // mutate harry
        harry.raiseSalary(10);

        // now harry and the clone are different
        System.out.println(harry);
        System.out.println(harry2);
    }
}

/**
   A class whose clone method uses serialization.
*/
class SerialCloneable implements Cloneable, Serializable {
    public Object clone() {
        try {
            // save the object to a byte array
            ByteArrayOutputStream bout = new ByteArrayOutputStream();
            ObjectOutputStream out = new ObjectOutputStream(bout);
            out.writeObject(this);
            out.close();

            // read a clone of the object from the byte array
            ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
            ObjectInputStream in = new ObjectInputStream(bin);
            Object ret = in.readObject();
            in.close();

            return ret;
        } catch (Exception e) {
            return null;
        }
    }
}

/**
   The familiar Employee class, redefined to extend the
   SerialCloneable class. 
*/
class Employee extends SerialCloneable {
    public Employee(String n, double s, int year, int month, int day) {
        name = n;
        salary = s;
        GregorianCalendar calendar = new GregorianCalendar(year, month - 1, day);
        hireDay = calendar.getTime();
    }

    public String getName() {
        return name;
    }

    public double getSalary() {
        return salary;
    }

    public Date getHireDay() {
        return hireDay;
    }

    public void raiseSalary(double byPercent) {
        double raise = salary * byPercent / 100;
        salary += raise;
    }

    public String toString() {
        return getClass().getName() + "[name=" + name + ",salary=" + salary + ",hireDay=" + hireDay + "]";
    }

    private String name;
    private double salary;
    private Date hireDay;
}