SerialCloneTestオブジェクト利用フロー方式clone
2894 ワード
package com.io.SerialCloneTest;
/**
@version 1.20 17 Aug 1998
@author Cay Horstmann
*/
import java.io.*;
import java.util.*;
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;
}