serializemutable.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.io.*;
/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class SerializeMutable
{
	public static void main(String[] args) 
	{
		ObjectOutputStream oos = null;
		ObjectInputStream ois = null;
		try
		{
			//创建一个ObjectOutputStream输入流
			oos = new ObjectOutputStream(
				new FileOutputStream("mutable.txt"));
			Person per = new Person("孙悟空", 500);
			//系统会per对象转换字节序列并输出
			oos.writeObject(per);
			//改变per对象的name属性
			per.setName("猪八戒");
			//系统只是输出序列化编号，所以改变后的name不会被序列化
			oos.writeObject(per);
			//创建一个ObjectInputStream输入流
			ois = new ObjectInputStream(
				new FileInputStream("mutable.txt"));
			Person p1 = (Person)ois.readObject();
			Person p2 = (Person)ois.readObject();
			//下面输出true，即反序列化后p1等于p2
			System.out.println(p1 == p2);
			//下面依然看到输出”孙悟空“，即改变后的属性没有被序列化
			System.out.println(p2.getName());
		}
		catch (Exception ex)
		{
			ex.printStackTrace();
		}
		finally
		{
			try
			{
				if (ois != null)
					ois.close();
				if (oos != null)
					oos.close();
			}
			catch (IOException ex)
			{
				ex.printStackTrace();
			}
		}
	}
}