设计模式那点事读书笔记(4)----原型模式

建造者模式: 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的对象。

解决什么问题: 

　　某些结构复杂的对象”的创建工作,由于需求的变化,这些对象经常面临着剧烈的变化,但是他们却拥有比较稳定一致的接口.

UML:

　　

代码结构:

　　

被拷贝的对象:

package com.prototype.pojo;

/**
 * 被拷贝的对象
 */
public class DayLife implements Cloneable {
    private String getUp;
    private String byBus;
    private String getFood;
    private String noon;
    private String afternoonWork;
    private String goHome;
    private String night;

    public String getGetUp() {
        return getUp;
    }

    public void setGetUp(String getUp) {
        this.getUp = getUp;
    }

    public String getByBus() {
        return byBus;
    }

    public void setByBus(String byBus) {
        this.byBus = byBus;
    }

    public String getGetFood() {
        return getFood;
    }

    public void setGetFood(String getFood) {
        this.getFood = getFood;
    }

    public String getNoon() {
        return noon;
    }

    public void setNoon(String noon) {
        this.noon = noon;
    }

    public String getAfternoonWork() {
        return afternoonWork;
    }

    public void setAfternoonWork(String afternoonWork) {
        this.afternoonWork = afternoonWork;
    }

    public String getGoHome() {
        return goHome;
    }

    public void setGoHome(String goHome) {
        this.goHome = goHome;
    }

    public String getNight() {
        return night;
    }

    public void setNight(String night) {
        this.night = night;
    }

    public void print() {
        System.out.println(this.getGetUp());
        System.out.println(this.getByBus());
        System.out.println(this.getGetFood());
        System.out.println(this.getNoon());
        System.out.println(this.getAfternoonWork());
        System.out.println(this.getGoHome());
        System.out.println(this.getNight());
    }

    @Override
    public DayLife clone() {
        try {
            return (DayLife) super.clone();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

被抽象的工厂:

package com.prototype.factory;

import com.prototype.pojo.DayLife;

/**
 * 被抽象的工厂
 */
public interface ILifeFactory {
    DayLife getInstance();
}

工厂实现类:

package com.prototype.factory;

import com.prototype.pojo.DayLife;

/**
 * 工厂实现类
 */
public class LifeFactoryImpl implements ILifeFactory {
    // 必须用静态变量来标明对象
    private static DayLife dayLife = null;

    @Override
    public DayLife getInstance() {
        if (dayLife == null) {
            System.out.println("New Day Life");
            dayLife = new DayLife();
            dayLife.setGetUp("7:00起床");
            dayLife.setByBus("7:30坐公交上班");
            dayLife.setGetFood("8:30到公司,在公司附近吃早点");
            dayLife.setNoon("吃中饭");
            dayLife.setAfternoonWork("13:00开始下午工作");
            dayLife.setGoHome("18:00下班");
            dayLife.setNight("晚上娱乐");
        } else {
            System.out.println("Clone Day Life");
            dayLife = dayLife.clone();
        }
        return dayLife;
    }
}

拷贝实现:

package main;

import com.prototype.factory.ILifeFactory;
import com.prototype.factory.LifeFactoryImpl;
import com.prototype.pojo.DayLife;

/**
 * Created by Administrator on 2016/8/10.
 */
public class MainApp {
    public static void main(String[] args) {
        ILifeFactory factory = new LifeFactoryImpl();
        factory.getInstance().print();

        System.out.println("-----------------------");
        DayLife dayLife = factory.getInstance();
        dayLife.setGetUp("7:30起床");
        dayLife.print();

        System.out.println("-----------------------");
        DayLife dayLife2 = factory.getInstance();
        dayLife2.setGetUp("8:00起床");
        dayLife2.print();
    }
}