设计模式之原型模式

来源：互联网发布：淘宝怎么删掉评价编辑：程序博客网时间：2024/06/03 19:15

原型模式定义：
       用原型对象指定创建对象的种类，并且通过复制这个对象创建新的对象。【深浅复制】，避免new浪费大量资源。
适用场合：
       （1）产生对象比较复杂，初始化需要很多资源的时候；
       （2）希望框架原型和产生对象分开的时候；
       （3）同一个对象可能会供其他调用者同时调用的时候。

public class DayLife implements Cloneable{

   private String getUp;
   private String byBus;
   private String buyFood;
   private String noon;
   private String afternoonWork;
   private String goHome;
   private String night;


   public DayLife() {
       /**
       * 在使用clone的时候构造方法不执行，所以构造方法中的初始化就需要在clone的时候也做
       */
       System.out.println("构造方法执行了");
   }
   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 getBuyFood() {
       return buyFood;
   }
   public void setBuyFood(String buyFood) {
       this.buyFood = buyFood;
   }
   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 printMessage(){
       System.out.println(this.getGetUp());
       System.out.println(this.getByBus());
       System.out.println(this.getBuyFood());
       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;

   }

}

public interface ILifeFactory {
public DayLife getInstance();
}

public class LifeFactoryImpl implements ILifeFactory {

   private static DayLife dl = null;
   @Override
   public DayLife getInstance() {
       if(dl==null){
           System.out.println("new DayLife");
           dl = new DayLife();
           dl.setGetUp("早上七点起床");
           dl.setByBus("乘坐公共汽车");
           dl.setBuyFood("买一个5块钱的煎饼果子");
           dl.setNoon("中午小憩一会儿");
           dl.setAfternoonWork("下午拼命干活");
           dl.setGoHome("欢天喜地地回家了");
           dl.setNight("晚上自慰一会儿");

       }else{
           System.out.println("clone DayLife");
           dl = dl.clone();
       }
       return dl;
   }

}
测试
public class Client {
   public static void main(String[] args) {
       ILifeFactory lf = new LifeFactoryImpl();
       lf.getInstance().printMessage();

       System.out.println("-----------------------------");
       DayLife dl = lf.getInstance();
       dl.setGetUp("早上起床晚了，7：30才");
       dl.printMessage();

       System.out.println("-----------------------------");
       DayLife dl2 = lf.getInstance();
       dl2.setNight("自慰多了，身体虚了");
       dl2.printMessage();
   }

}

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