GOF23的一些总结（四）

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克隆模式的核心：通过new产生一个新对象需要非常繁琐的数据对象和和访问权限，则可以利用原型模式。克隆类似于new对象，但是于new对象完全不同，clone对象是一个于原来对象属性完全一样的对象。
浅克隆的一种方式
sheep方法

package com.dasenlin.cn;import java.util.Date;/** * 羊的实体类 * @author Administrator *  若要使用clone方法，得先要集成Cloneable方法 */public class Sheep implements Cloneable {    private String name;    private Date birthday;    @Override    protected Object clone() throws CloneNotSupportedException {        Object obj =super.clone();//浅克隆        return obj;    }    public Sheep() {        super();    }    public Sheep(String name, Date birthday) {        super();        this.name = name;        this.birthday = birthday;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }}

深克隆的一种方法

package com.dasenlin.cn;import java.util.Date;/** * 测试深克隆 * @author Administrator * */public class Sheep2 implements Cloneable {    private String name;    private Date birthday;    public Sheep2() {        super();    }    public Sheep2(String name, Date birthday) {        super();        this.name = name;        this.birthday = birthday;    }    @Override    protected Object clone() throws CloneNotSupportedException {         Object obj=super.clone();         //添加如下代码实现深复制         Sheep2 s=(Sheep2)obj;         s.birthday=(Date)this.birthday.clone();//把属性也进行克隆         return obj;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }}

测试的方法

package com.dasenlin.cn;import java.util.Date;/** * 测试Object的clone的方法（浅克隆测试） * @author Administrator * */public class Client {    public static void main(String[] args) {        try {                   Sheep s1 =new Sheep("多利的来源体",new Date(789524687952L));            Sheep s2=(Sheep)s1.clone();                      System.out.println(s1.getBirthday());                      System.out.println(s1);                      System.out.println(s1.getName());                      System.out.println(s1.getBirthday());                      s1.setBirthday(new Date(18769523685789L));                      System.out.println(s1.getBirthday()+"修改了的时间");                        System.out.println(s2);                        s2.setName("多利");                        System.out.println(s2.getName());                        System.out.println(s2.getBirthday());                } catch (CloneNotSupportedException e) {                    e.printStackTrace();                }    }}

深克隆测试

package com.dasenlin.cn;import java.util.Date;/** * 测试Object的clone的方法（深克隆测试） * @author Administrator * */public class Client2 {    public static void main(String[] args) {        try {                   Sheep2 s1 = new Sheep2("多利的来源体",new Date(789524687952L));            Sheep2 s2 = (Sheep2)s1.clone();                      System.out.println(s1.getBirthday());                      System.out.println(s1);                      System.out.println(s1.getName());                      System.out.println(s1.getBirthday());                      s1.setBirthday(new Date(18769523685789L));                      System.out.println(s1.getBirthday()+"修改了的时间");                        System.out.println(s2);                        s2.setName("多利");                        System.out.println(s2.getName());                        System.out.println(s2.getBirthday());                } catch (CloneNotSupportedException e) {                    e.printStackTrace();                }    }}

实现深克隆的另外一种方式，序列化和反序列化
实现深克隆序列化的实体类

package com.dasenlin.cn;import java.util.Date;/** * 羊的实体类 * @author Administrator *  若要使用clone方法，得先要集成Cloneable方法 */public class Sheep implements Cloneable,Serializable {    private String name;    private Date birthday;    @Override    protected Object clone() throws CloneNotSupportedException {        Object obj =super.clone();//浅克隆        return obj;    }    public Sheep() {        super();    }    public Sheep(String name, Date birthday) {        super();        this.name = name;        this.birthday = birthday;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }}

测试代码

public class Client3 {    public static void main(String[] args) {        try {                   Sheep s1 =new Sheep("多利的来源体",new Date(789524687952L));                      System.out.println(s1);                      System.out.println(s1.getName());                      System.out.println(s1.getBirthday());            try{            ByteArrayOutputStream bos = new ByteArrayOutputStream();            ObjectOutputStream oos = new ObjectOutputStream(bos);                               oos.writeObject(s1);                    byte[]temp = bos.toByteArray();            ByteArrayInputStream bis = new ByteArrayInputStream(temp);            ObjectInputStream ois = new ObjectInputStream(bis);                        Sheep s2 =(Sheep)ois.readObject();            }catch(IOException e){                    e.printStrack();            }finally{                CloseUtil(bis,ois,);            }                      s1.setBirthday(new Date(18769523685789L));                      System.out.println(s1.getBirthday()+"修改了的时间");                        System.out.println(s2);                        s2.setName("多利");                        System.out.println(s2.getName());                        System.out.println(s2.getBirthday());                } catch (CloneNotSupportedException e) {                    e.printStackTrace();                }    }}

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