设计模式读书笔记-----访问者模式DEMO修改

读访问者模式资料：http://blog.csdn.net/chenssy/article/details/12029633

直觉这写法有问题。访问的应该是药单，而不是药，特改写如下：

public abstract class Visitor {
	protected String name;

	public void setName(String name) {
		this.name = name;
	}

	public abstract void visitor(Presciption p);
}

public class Charger extends Visitor{
	public void visitor(Presciption p) {
		for(Medicine m : p.list){
			System.out.println("划价员：" + name + "给药" + m.getName() + "划价:" + m.getPrice());
		}
	}
}

public class WorkerOfPharmacy extends Visitor{
	public void visitor(Presciption p) {
		for(Medicine m : p.list){
			System.out.println("药房工作者：" + name + "拿药 ：" + m.getName());
		}
	}

	/*public void visitor(MedicineB b) {
		System.out.println("药房工作者：" + name + "拿药 ：" + b.getName());
	}*/
}

public class Medicine {
	protected String name;
	protected double price;

	public Medicine(String name, double price) {
		this.name = name;
		this.price = price;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public double getPrice() {
		return price;
	}

	public void setPrice(double price) {
		this.price = price;
	}

	//public abstract void accept(Visitor visitor);
}

　　

public class MedicineA extends Medicine{
	public MedicineA(String name, double price) {
		super(name, price);
	}
}

　　

public class MedicineB extends Medicine {
	public MedicineB(String name, double price) {  
        super(name, price);  
    }
}

　　

public class Presciption {
	List<Medicine> list = new ArrayList<Medicine>();  
    
    public void accept(Visitor visitor){
    	visitor.visitor(this);
    }
      
    public void addMedicine(Medicine medicine){  
        list.add(medicine);  
    }  
      
    public void removeMedicien(Medicine medicine){  
        list.remove(medicine);  
    }  
}

　　

public class Client {
	public static void main(String[] args) {
		Medicine a = new MedicineA("板蓝根", 11.0);
		Medicine b = new MedicineB("感康", 14.3);

		Presciption presciption = new Presciption();
		presciption.addMedicine(a);
		presciption.addMedicine(b);

		Visitor charger = new Charger();
		charger.setName("张三");

		Visitor workerOfPharmacy = new WorkerOfPharmacy();
		workerOfPharmacy.setName("李四");

		presciption.accept(charger);
		System.out.println("-------------------------------------");
		presciption.accept(workerOfPharmacy);
	}
}