练习题_已知出租车的计费规则如下

1. 使用多态和接口区分两个不同时间段的收费机制。
2. 使用工厂方法决定实例化哪个类。
3. 计算即可

---

测试的Main方法

package tax;

import java.util.Scanner;

/**
 * @author 青韵
 * @date 2020/3/7 - 13:00
 */
public class CalculateMoney {
    public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        double miles = input.nextDouble();
        BaseTime time = TimeFactory.getTime();
        System.out.println(time.calculate(miles));
    }
}

工厂类

package tax;

import java.time.LocalTime;
import java.time.format.DateTimeFormatter;

/**
 * @author 青韵
 * @date 2020/3/7 - 13:05
 */
public class TimeFactory {
    public static final LocalTime START = LocalTime.of(6, 0);
    public static final LocalTime END = LocalTime.of(23, 0);

    public static BaseTime getTime() {
        if (LocalTime.now().isAfter(START) && LocalTime.now().isBefore(END)) {
            return new NormalTime();
        } else {
            return new ExtraTime();
        }
    }
}

接口类

package tax;

/**
 * @author 青韵
 * @date 2020/3/7 - 13:04
 */
public interface Time {
    double[] getBalanceByMiles();
}

实现接口的抽象类

package tax;

/**
 * @author 青韵
 * @date 2020/3/7 - 13:23
 */
public abstract class BaseTime implements Time {
    private static final double START = 3;
    private static final double END = 15;

    public double calculate(double miles) {
        double[] mileMoneyList = this.getBalanceByMiles();
        double result = mileMoneyList[0];

        if (miles - END > 0) {
            result += (miles - END) * mileMoneyList[2];
            miles = END;
        }
        if (miles - START > 0) {
            result += (miles - START) * mileMoneyList[1];
        }

        return result;
    }
}

正常时间段类6.00-23.00

package tax;

/**
 * @author 青韵
 * @date 2020/3/7 - 13:05
 */
public class NormalTime extends BaseTime {
    private static final double BASE_MONEY = 10;

    @Override
    public double[] getBalanceByMiles() {
        return new double[]{BASE_MONEY, 1.2, 2};
    }
}

其他时间段类

package tax;

/**
 * @author 青韵
 * @date 2020/3/7 - 13:23
 */
public class ExtraTime extends BaseTime {
    private static final double BASE_MONEY = 12;

    @Override
    public double[] getBalanceByMiles() {
        return new double[]{BASE_MONEY, 1.4, 3};
    }
}