【创建型模式】《大话设计模式》——读后感 （11）简历复印？——原型模式

原型模式：用原型实例指定创建对象的种类，并且通过拷贝这些原型创建新对象[DP]

 

说白了，原型模式还是属于创建型模式，主要功能还是创建新对象。下面我自己写一个原型模式试试：

案例1：自己写

原型接口（Prototy）：

package com.sjmx.prototype.first;public interface Prototy {        public Object clone();    }

WorkExperience：

package com.sjmx.prototype.first;public class WorkExperience implements Prototy{        private String workDate;    private String address;        public String getWorkDate() {        return workDate;    }    public void setWorkDate(String workDate) {        this.workDate = workDate;    }    public String getAddress() {        return address;    }    public void setAddress(String address) {        this.address = address;    }        @Override    public Object clone(){        return new WorkExperience();    }        }

 

ConPrototype：

package com.sjmx.prototype.first;public class ConPrototype implements Prototy {        public WorkExperience work;    private String name;    private int age;        public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public ConPrototype() {        super();        this.work = new WorkExperience();    }            public void setExperience(String workDate ,String address) {        work.setAddress(address);        work.setWorkDate(workDate);    }        @Override    public Object clone(){        ConPrototype con = new ConPrototype();        con.work =    (WorkExperience) this.work.clone();        return con;    }    }

客户端调用：

package com.sjmx.prototype.first;public class Client {        public static void main(String[] args) {                ConPrototype p = new ConPrototype();        p.setAge(19);        p.setName("java");        p.setExperience("2014-02-12", "华晨科技");                ConPrototype p2 = null;        try {            p2 = (ConPrototype) p.clone();            p2.setExperience("2015-02-12", "隆正互联");        } catch (Exception e) {            e.printStackTrace();        }                ConPrototype p3 = null;        try {            p3 = (ConPrototype) p.clone();            p3.setAge(13);            p3.setName("C");            p3.setExperience("2017-02-12", "苏南科技");        } catch (Exception e) {            e.printStackTrace();        }                System.out.println(p.getName());        System.out.println(p.getAge());        System.out.println(p.work.getWorkDate());        System.out.println(p.work.getAddress());        System.out.println("---------------------");                System.out.println(p2.getName());        System.out.println(p2.getAge());        System.out.println(p2.work.getWorkDate());        System.out.println(p2.work.getAddress());        System.out.println("---------------------");                System.out.println(p3.getName());        System.out.println(p3.getAge());        System.out.println(p3.work.getWorkDate());        System.out.println(p3.work.getAddress());     }}

执行结果：

java192014-02-12华晨科技---------------------null02015-02-12隆正互联---------------------C132017-02-12苏南科技

分析：通过p和p2的比较, 我发现p2中的ConPrototype类信息没有值，而里面的内置对象WorkExperience却有数据，说明我模拟的原型全是是new出来的新对象，如果不提前设置值的话，会出现为空的情况；而再看看p3的打印结果，p3的值并没有覆盖之前p或p2设置好的值，说明我模拟的原型模式基本实现了深复制的功能，但却没有实现浅复制，必须要去设置人员name、age才行，这是bug；

 

案例2：jdk自带接口实现

WorkExperience：

package com.sjmx.prototype.sec;public class WorkExperience implements Cloneable{        private String workDate;    private String address;        public String getWorkDate() {        return workDate;    }    public void setWorkDate(String workDate) {        this.workDate = workDate;    }    public String getAddress() {        return address;    }    public void setAddress(String address) {        this.address = address;    }        @Override    protected Object clone() throws CloneNotSupportedException{        WorkExperience con =  (WorkExperience)super.clone();        return con;    }        }

ConPrototype：

package com.sjmx.prototype.sec;public class ConPrototype implements Cloneable {        public WorkExperience work;    private String name;    private int age;        public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public ConPrototype() {        super();        this.work = new WorkExperience();    }            public void setExperience(String workDate ,String address) {        work.setAddress(address);        work.setWorkDate(workDate);    }        @Override    protected Object clone() throws CloneNotSupportedException{        ConPrototype con =  (ConPrototype)super.clone();        con.work =    (WorkExperience) this.work.clone();        return con;    }    }

运行结果：

java192014-02-12华晨科技---------------------java192015-02-12隆正互联---------------------C132017-02-12苏南科技

分析：1、通过p和p2的比较, 我发现p2中的ConPrototype类信息没有设置值，但是打印出来的却是有值的，而且和p里面的值一致，说明此接口实现浅复制；

          2、再看看p3的打印结果，p3的值并没有覆盖之前p或p2设置好的值，说明使用jdk自带的接Cloneable也实现 了深复制：