C06 原型模式 示例（五） 深克隆2

示例类图

05.2_原型模式_深复制.jpg

深克隆示例

1/2_ConcreteProtype

• 注意 clone() 方法用的是流的方式，相比单独调用 Pig 的 birthday 的 clone()，流的方式更具一般性；

public class Email implements Serializable {

    private Attachment attachment = null;

    public Email() {
        this.attachment = new Attachment();
    }

    public Object deepClone() throws IOException, ClassNotFoundException {
        ByteArrayOutputStream bao = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bao);
        oos.writeObject(this);

        ByteArrayInputStream bis = new ByteArrayInputStream(bao.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bis);
        return (ois.readObject());
    }

    public Attachment getAttachment() {
        return attachment;
    }

    public void display() {
        System.out.println("查看邮件");
    }
}

2/2_Client

public class Client {

    public static void main(String[] args) {
        Email email = new Email();

        try {
            Email copyEmail = (Email) email.deepClone();

            System.out.println("email == copyEmail ?");
            System.out.println(email == copyEmail);

            System.out.println("email.getAttachment == copyEmail.getAttachment ?");
            System.out.println(email.getAttachment() == copyEmail.getAttachment());
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

    }

}

输出

email == copyEmail ?
false
email.getAttachment == copyEmail.getAttachment ?
false