设计模式之原型模式

一 prototype

二 浅拷贝

obj对象的clone方法 继承Cloneable接口（空接口）是规范

public class Sheep implements Cloneable,Serializable {   //1997,英国的克隆羊，多利！    private String sname;    private Date birthday;    @Override    protected Object clone() throws CloneNotSupportedException {        Object obj = super.clone();  //直接调用object对象的clone()方法！        return obj;    }    public String getSname() {        return sname;    }    public void setSname(String sname) {        this.sname = sname;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    public Sheep(String sname, Date birthday) {        super();        this.sname = sname;        this.birthday = birthday;    }        public Sheep() {    }}

其中克隆后的对象指向同一个Date地址，其中一个date改变另外一个随之改变

三 深拷贝

public class Sheep2 implements Cloneable {   //1997,英国的克隆羊，多利！    private String sname;    private Date birthday;    @Override    protected Object clone() throws CloneNotSupportedException {        Object obj = super.clone();  //直接调用object对象的clone()方法！        //添加如下代码实现深复制(deep Clone)        Sheep2 s = (Sheep2) obj;        s.birthday = (Date) this.birthday.clone();  //把属性也进行克隆！        return obj;    }    public String getSname() {        return sname;    }    public void setSname(String sname) {        this.sname = sname;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    public Sheep2(String sname, Date birthday) {        super();        this.sname = sname;        this.birthday = birthday;    }    public Sheep2() {    }   }

四 利用序列化和反序列化进行深拷贝

public class Client3 {    public static void main(String[] args) throws CloneNotSupportedException, Exception {        Date date = new Date(12312321331L);        Sheep s1 = new Sheep("少利",date);        System.out.println(s1);        System.out.println(s1.getSname());        System.out.println(s1.getBirthday());//      使用序列化和反序列化实现深复制        ByteArrayOutputStream bos = new ByteArrayOutputStream();        ObjectOutputStream    oos = new ObjectOutputStream(bos);        oos.writeObject(s1);        byte[] bytes = bos.toByteArray();        ByteArrayInputStream  bis = new ByteArrayInputStream(bytes);        ObjectInputStream     ois = new ObjectInputStream(bis);        Sheep s2 = (Sheep) ois.readObject();   //克隆好的对象！        System.out.println("修改原型对象的属性值");          date.setTime(23432432423L);        System.out.println(s1.getBirthday());        s2.setSname("多利");        System.out.println(s2);        System.out.println(s2.getSname());        System.out.println(s2.getBirthday());       }}

将原型模式和工厂模式结合起来：

以上几篇设计模式为创建型模式