java design pattern - prototype pattern

就是通过clone() 来创建一个新的对象。
代码一看就明白了，java 实现Cloneable()接口而实现的clone() 方法是shallow copy. 

package prototypepattern;

class Bike implements Cloneable{

    private int gears;
    private String bikeType;
    private String model;

    public Bike(){
        bikeType = "Standard";
        model = "Leopard";
        gears = 4;

    }

    public Bike clone(){
        return new Bike();
    }

    public void makeAdvanced(){
        bikeType = "Advanced";
        model = "Jaguar";
        gears = 6;

    }

    public String getModel(){
        return model;
    }

    @Override
    public String toString(){
        return "Bike [gears ="+gears+",bikeType="+bikeType+",model="+
            model+"]";
    }
}

public class PrototypeDemo {
    public Bike makeJaguar(Bike basicBike){
        basicBike.makeAdvanced();
        return basicBike;
    }

    public static void main(String[] args){
        Bike bike = new Bike();
        Bike basicBike = bike.clone();
        PrototypeDemo pt = new PrototypeDemo();
        Bike advancedBike = pt.makeJaguar(basicBike);
        System.out.println("Prototype Design Pattern"+advancedBike.getModel());
        System.out.println("Prototype Design Pattern"+advancedBike.toString());
    }
}