找回感觉的练习

package feel.java;

public interface Payment {
    public double downPay(double price, double area) ;
}

package feel.java;

/**
 * @author WH
 * @project Java
 * @package feel.java
 * @date 2019/11/6 21:25
 */
public class Residence implements Payment {
    public double downPay(double price, double area) {
        return price * area * 0.2;
    }
}

package feel.java;

/**
 * @author WH
 * @project Java
 * @package feel.java
 * @date 2019/11/6 21:29
 */
public class Commercial implements Payment {
    public double downPay(double price, double area) {
        return price * area * 0.45;
    }
}

package feel.java;

import java.util.Scanner;

/**
 * @author WH
 * @project Java
 * @package feel.java
 * @date 2019/11/6 21:35
 */
public class Feel1 {
        public static void main(String[] args) {
            System.out.println("请输入住宅产权房屋的信息(每平方米的价格 , 总平方数)");
            Scanner en= new Scanner(System.in);
            Residence residence = new Residence();
            double value= residence.downPay(en.nextDouble(), en.nextDouble());
            System.out.println(value);
            System.out.println("请输入商业产权房屋的信息(每平方米的价格 , 总平方数)");
            Payment payment = new Commercial();
            final double value1 = payment.downPay(en.nextDouble(), en.nextDouble());
            System.out.println(value1);
        }
    }