子类继承之序列化解决方案

在写原型模式的时候,在用clone()方法实现了的时候,发现对于深拷贝来说,会对每一个相关类添加clone方法.这样会增加代码量,故推荐在深拷贝的时候使用序列化与反序列化实行.参见于我写的原型模式.
在写序列化的时候,我想到关于子类继承实现序列化的问题,倘若是父类实现了Serializable接口,那直接对子类序列化即可.倘若父类没有实现,而子类实现了Serializable,那仅能得到子类属性而得不到其集成自父类的属性了.当然倘若都不实现Serializable,那在序列化的时候是会报错的.对象序列化的时候必须实现Serializable.
下面是父类实现了Serializable的代码:

package serializable;

import java.io.Serializable;

public class SuperClass implements Serializable {

	 String name;
	 String age;

	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getAge() {
		return age;
	}
	public void setAge(String age) {
		this.age = age;
	}
	

}

package serializable;


public class SonClass extends SuperClass {
	String sex;
	String profession;

	public String getSex() {
		return sex;

	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public String getProfession() {
		return profession;
	}

	public void setProfession(String profession) {
		this.profession = profession;
	}

}

package serializable;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class Test {
	public static void main(String[] args) {
		SonClass son = new SonClass();
		son.setName("Alex");
		son.setAge("20");
		son.setProfession("fighter");
		son.setSex("man");
		SonClass son2=null;
		try {
			FileOutputStream ba = new FileOutputStream("text.txt");
			ObjectOutputStream oo = new ObjectOutputStream(ba);
			oo.writeObject(son);
			oo.flush();
			oo.close();

			FileInputStream bi = new FileInputStream("text.txt");
			ObjectInputStream oi = new ObjectInputStream(bi);
			son2 = (SonClass) oi.readObject();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		System.out.println(son2.getName());
		System.out.println(son2.getAge());
		System.out.println(son2.getProfession());
		System.out.println(son2.getSex());

	}
}

当父类没有实现serializable,而子类实现的情况下,解决的办法是若父类有带参构造方法的时候,需要添加一个无参构造方法,子类中需要加上:

	private void writeObject(ObjectOutputStream out) throws IOException {
		out.defaultWriteObject();
		out.writeObject(name);
		out.writeObject(age);

	}

	private void readObject(ObjectInputStream in) throws IOException,
			ClassNotFoundException {
		in.defaultReadObject();
		name = (String) in.readObject();
		age = (String) in.readObject();
	}

此方法在序列化时候自动调用,先序列化子类,然后序列化父类的属性.