策略模式+简单工厂之旅游出行策略与门票折扣案例

文章目录

策略模式+简单工厂

（1）旅游出行策略（飞机，高铁，大巴，骑行，徒步至少两种出行方式）

出行类：

package gsg.gao4;
class AirplaneStrategy implements  TravelStrategy
{	
	public void travelMethod()
	{
		System.out.println("飞机游！");
	}
}

class TrainStrategy implements  TravelStrategy
{
	public void travelMethod()
	{
		System.out.println("火车游！");
	}
}

class BicycleTravelStrategy implements  TravelStrategy
{
	public void travelMethod()
	{
		System.out.println("大巴游！");
	}
}
class buxing implements  TravelStrategy
{
	public void travelMethod()
	{
		System.out.println("步行！");
	}
}

MyContext类：

package gsg.gao4;

public class MyContext
{
	private TravelStrategy ts;
	public MyContext(TravelStrategy ts)
	{
		this.ts=ts;
	}
	public void travelMethod()
	{
		ts.travelMethod();
	}
}
TravelStrategy类：
package gsg.gao4;

interface TravelStrategy
{
	
	public void travelMethod();

}
测试类；
package gsg.gao4;

import java.util.Scanner;

public class Client {
	public static void main(String args[])
	{
		System.out.println("请输入你的出行方式  1，飞机  2.火车  3.大巴 4.步行");
		
		//调用scoreInput方法，定义score接收用户输入值
        Scanner scoreInput = new Scanner(System.in);

		int score = scoreInput.nextInt();
		if (score==1) {
			MyContext mc=new MyContext(new AirplaneStrategy());
			mc.travelMethod();
		}else if (score==2) {
			MyContext mc=new MyContext(new TrainStrategy());
			mc.travelMethod();
		}else if (score==3) {
			MyContext mc=new MyContext(new BicycleTravelStrategy());
			mc.travelMethod();
		}else if (score==4) {
			MyContext mc=new MyContext(new buxing());
			mc.travelMethod();
		}
		
	}
}

结果：

（2）门票折扣

AgedDiscount类：

package gsg.gao1;
public class AgedDiscount implements Discount {
	private final double DISCOUNT = 0.5;
	public double calculate(double price) {
		System.out.println("老人票:");
		return price * DISCOUNT;
	}
}
 ChildrenDiscount类；
package gsg.gao1;
public class ChildrenDiscount implements Discount {
	public final double DISCOUNT =0;
	public double calculate(double price) {
		System.out.println("儿童票:");
		if(price>=20) {
			return price*DISCOUNT;
		}
		else {
			return price;
		}
	}
}
Discount类：
package gsg.gao1;

public interface Discount {
	public double calculate(double price);

}

StudentDiscount类；

package gsg.gao1;
public class StudentDiscount implements Discount {
	private final double DISCOUNT = 0.8;
	public double calculate(double price) {
		System.out.println("学生票:");
		return price * DISCOUNT;
	}
}
Ticket类：
package gsg.gao1;
public class Ticket {
	private  double price;
	private Discount discount;
	public void setPrice(double price) {
		this.price = price;
	}
	public void setDiscount(Discount discount) {
		this.discount = discount;
	}
	public double getPrice() {
		return discount.calculate(this.price);
	}

}

测试类；

package gsg.gao1;

import java.util.Scanner;

public class Client {
	public static void main(String args[]) {
		Ticket tt = new Ticket();
		double orginalPrice=210.0;
		double currentPrice;
		tt.setPrice(orginalPrice);
		System.out.println("原始价为:" + orginalPrice);
		System.out.println("-------------");
		System.out.println("请输入你的票  1，老人票  2.学生票  3.儿童票");
	
		//调用scoreInput方法，定义score接收用户输入值
        Scanner scoreInput = new Scanner(System.in);

		int score = scoreInput.nextInt();
		if (score==1) {

		Discount discount;
		discount = new AgedDiscount();
		tt.setDiscount(discount);
		currentPrice = tt.getPrice();
		System.out.println("折后价为:"+currentPrice);
		}else if(score==2){
			Discount discount;
			discount = new StudentDiscount();
			tt.setDiscount(discount);
			currentPrice = tt.getPrice();
			System.out.println("折后价为:"+currentPrice);
		}else if (score==3) {
			Discount discount;
			discount = new ChildrenDiscount();
			tt.setDiscount(discount);
			currentPrice = tt.getPrice();
			System.out.println("折后价为:"+currentPrice);
		} 	}}

结果：