Data Structures Programming Assignment 1：OOP Review

AI悦创原创2023年2月14日大约 7 分钟...约 2184 字

Last month, scientists at NASA discovered life on Mars, Neptune, and Saturn! Your job is to create a program that can convert currencies between the planets to aid in interplanetary transactions.

上个月，美国宇航局的科学家在火星、海王星和土星上发现了生命!你的工作是创建一个程序，可以在行星之间转换货币，以帮助星际交易。

Implementation details

实现细节

You will create 3 currency classes: Mars.java, Neptune.java, and Saturn.java. Each of these classes must derive from an abstract parent class Currency.java and implement the interface Exchangeable.java.

您将创建3个货币类:Mars.java、Neptune.java和Saturn.java。这些类中的每一个都必须派生自抽象父类Currency.java，并实现接口exchangable .java。

Currency.java

Currency.java

The currency class must contain the following data members:

货币类必须包含以下数据成员:

name of the currency (String currencyName)

货币名称(String currencyName)

MarsMoney

火星货币

NeptuneNuggets

海王星掘金

SaturnSilver

土星银

total funds (double totalFunds)

总资金(双倍totalFunds)

Additionally, because the planets only trust Earth, dollars will serve as the intermediary currency. The Currency class will contain the following 2 abstract methods:

此外，由于行星只信任地球，美元将作为中介货币。Currency类将包含以下2个抽象方法:

public abstract double toEarthDollars(double amount);

public abstract double fromEarthDollars(double EarthDollars);

Use these methods to exchange money between planets.

使用这些方法在行星之间交换货币。

Exchangeable.java

可交换的

Exchange rates should be implemented as constants in the Exchangeable interface.

1.00 EarthDollar (ED) = 1.30 MarsMoney (MM) = 0.87 SaturnSilver (SS) = 2.00 Neptune Nuggets (NN)

汇率应该在Exchangeable接口中作为常量实现。
1.00 EarthDollar (ED) = 1.30 MarsMoney (MM) = 0.87 SaturnSilver (SS) = 2.00 Neptune Nuggets (NN)

Note that we may change the values of the exchange rates when testing your code. We will only edit the Exchangeable interface, so rates should be encapsulated in and accessed from Exchangeable.java.

请注意，在测试代码时，我们可能会更改汇率的值。我们将只编辑Exchangeable接口，因此费率应该封装在exchangable .java中并从其中访问。

Exchangeable must also include a method to exchange between the current currency and a target currency. When a planet calls exchange() with another planet and a specified amount, the methods toEarthDollars() and fromEarthDollars() should be used to convert the source currency into the target currency. The amount should be subtracted from the calling planet and added to the target planet. If a planet tries to exchange more funds than it currently has, an error should be printed and no transfer should occur.

Exchangeable还必须包括在当前货币和目标货币之间进行交换的方法。当一个行星对另一个行星调用exchange()并指定金额时，应该使用toEarthDollars()和froearthdollars()方法将源货币转换为目标货币。该金额应从调用行星中减去，并添加到目标行星。如果一个星球试图交换比它目前拥有的更多的资金，则应该打印一个错误，并且不应该发生转移。

The exchange method should have the following signature:

交换方法应具有以下签名:

public void exchange(Currency other, double amount);

The remainder of the implementation details are up to you. As always, use best practices, including the principle of least privilege, inheritance, and encapsulation as much as possible.

其余的实现细节由您决定。与往常一样，使用最佳实践，包括尽可能少的特权原则、继承和封装。

Submission details

提交详细信息

Your code should also include a main method (you can put it in Currency.java or create a separate class) to test your functionality.

您的代码还应该包括一个主方法(您可以将它放在Currency.java中或创建一个单独的类)来测试您的功能。

Please zip all source files and submit on NYU Classes.

请将所有源文件压缩并在纽约大学课堂上提交。

Sample run

样本运行

Input

Currency mars = new Mars(100.00); 
Currency neptune = new Neptune(100.00); 
Currency saturn = new Saturn(100.00);
System.out.println("<-- Exchanges -->");
mars.exchange(saturn, 25.0); 
neptune.exchange(saturn, 10.0); 
saturn.exchange(mars, 122.0); 
saturn.exchange(mars, 121.0);

Output

<-- Exchanges -->
Converting from MarsMoney to SaturnSilver and initiating transfer... 
$25.00 MarsMoney = $19.23 EarthDollars = 16.73 SaturnSilver
Mars has a total of $75.00 MarsMoney
Saturn has a total of $116.73 SaturnSilver

Converting from NeptuneNuggets to SaturnSilver and initiating transfer...
$10.00 NeptuneNuggets = $5.00 EarthDollars = 4.35 SaturnSilver 
Neptune has a total of $90.00 NeptuneNuggets
Saturn has a total of $121.08 SaturnSilver

Uh oh - Saturn only has an available balance of $121.08, which is less than $122.00!

Converting from SaturnSilver to MarsMoney and initiating transfer... 
$121.00 SaturnSilver = $139.08 EarthDollars = 180.80 MarsMoney Saturn has a total of $0.08 SaturnSilver
Mars has a total of $255.80 MarsMoney

Answer

Currency.java

/**
 * @ClassName: Currency
 * @Description: TODO
 * @Author: AndersonHJB
 * @date: 2023/2/19 08:22
 * @Version: V1.0
 * @Blog: https://bornforthis.cn
 */
abstract class Currency implements Exchangeable {
    private String currencyName;

    private double totalFunds;

    public Currency() {
        this.currencyName = "";
        this.totalFunds = 0;
    }

    public Currency(double totalFunds) {
        this.totalFunds = totalFunds;
    }

    public String getCurrencyName() {
        return currencyName;
    }

    public double getTotalFunds() {
        return totalFunds;
    }

    public void setCurrencyName(String currencyName) {
        this.currencyName = currencyName;
    }

    public void setTotalFunds(double totalFunds) {
        this.totalFunds = totalFunds;
    }

    public abstract double toEarthDollars(double amount);
    public abstract double fromEarthDollars(double EarthDollars);
}

Exchangeable.java

/**
 * @ClassName: Exchangeable
 * @Description: TODO
 * @Author: AndersonHJB
 * @date: 2023/2/19 08:36
 * @Version: V1.0
 * @Blog: https://bornforthis.cn
 */
public interface Exchangeable {
    final static double EARTH_DOLLAR = 1.0;
    final static double MARS_MONEY  = 1.3;
    final static double NEPTUNE_NUGGETS = 2;
    final static double SATURN_SILVER = 0.87;

    public void exchange (Currency other, double amount);
}

Mars.java


import java.math.BigDecimal;

public class Mars extends Currency {

    private String currencyName;
    private double totalFunds;

    public void setCurrencyName(String currencyName) {
        this.currencyName = currencyName;
    }

    public void setTotalFunds(double totalFunds) {
        this.totalFunds = totalFunds;
    }


    public String getCurrencyName() {
        return currencyName;
    }

    public double getTotalFunds() {
        return totalFunds;
    }

    public Mars() {
        super();
    }


    public Mars(double totalFunds) {
        this.currencyName = "MarsMoney";
        this.totalFunds = totalFunds;
    }


    @Override
    public double toEarthDollars(double amount) {
        BigDecimal MARStoEARTHDollarBigDecimal = new BigDecimal(amount / MARS_MONEY);
        double returnAmount = MARStoEARTHDollarBigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
        return returnAmount;
    }

    @Override
    public double fromEarthDollars(double EarthDollars) {
        // TODO Auto-generated method stub
        BigDecimal MARSFROMEARTHBigDecimal = new BigDecimal(EarthDollars).multiply(new BigDecimal(MARS_MONEY));
        double returnAmount = MARSFROMEARTHBigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
        return returnAmount;
    }

    @Override
    public void exchange(Currency other, double amount) {

        if (amount > this.getTotalFunds()) {

            System.out.println("Uh oh - " + this.currencyName + " only has an available balance of $" + this.getTotalFunds() + ", which is less than $" + amount + "?\n");
            return;
        }
        double earthDollars = this.toEarthDollars(amount);
        double newAmount = other.fromEarthDollars(earthDollars);
        this.setTotalFunds(new BigDecimal(this.getTotalFunds() - amount).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue());
        other.setTotalFunds(new BigDecimal(other.getTotalFunds() + newAmount).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue());
        System.out.println("Converting from " + this.currencyName + " to " + other.getCurrencyName() + " and initiating transfer... \n$" + amount + this.getCurrencyName() + "= $" + earthDollars + " EarthDollars = " + newAmount + " " + other.getCurrencyName() + "\n" + this.getClass().getSimpleName() + "  has a total of $" + this.getTotalFunds() +
                " " + this.getCurrencyName() + "  \n" + other.getClass().getSimpleName() + " has a total of $" + other.getTotalFunds() + " " + other.getCurrencyName() + "\n");
//                " " + this.getClass().getSimpleName() + "  \n" + other.getClass().getSimpleName() + " has a total of $" + other.getTotalFunds() + " " + other.getCurrencyName() + "\n");
    }

}

Neptune.java

/**
 * @ClassName: Neptune
 * @Description: TODO
 * @Author: AndersonHJB
 * @date: 2023/2/19 09:55
 * @Version: V1.0
 * @Blog: https://bornforthis.cn
 */

import java.math.BigDecimal;

public class Neptune extends Currency {
    private String currencyName;
    private double totalFunds;

    public String getCurrencyName() {
        return currencyName;
    }

    public double getTotalFunds() {
        return totalFunds;
    }

    public void setCurrencyName(String currencyName) {
        this.currencyName = currencyName;
    }

    public void setTotalFunds(double totalFunds) {
        this.totalFunds = totalFunds;
    }

    public Neptune() {
        this.currencyName = "NeptuneNuggets";
    }

    public Neptune(double totalFunds) {
        this.currencyName = "NeptuneNuggets";
        this.totalFunds = totalFunds;
    }

    @Override
    public double toEarthDollars(double amount) {
        // TODO Auto-generated method stub
        BigDecimal NEPTUNETOEARTHDollarBigDecimal = new BigDecimal(amount / NEPTUNE_NUGGETS);
        double returnAmount = NEPTUNETOEARTHDollarBigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
        return returnAmount;
    }

    @Override
    public double fromEarthDollars(double EarthDollars) {
        // TODO Auto-generated method stub
        BigDecimal NEPTUNEFROMEARTHBigDecimal = new BigDecimal(EarthDollars).multiply(new BigDecimal(NEPTUNE_NUGGETS));
        double returnAmount = NEPTUNEFROMEARTHBigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
        return returnAmount;
    }

    @Override
    public void exchange(Currency other, double amount) {
        if(amount > this.getTotalFunds()) {

            System.out.println("Uh oh - " + this.currencyName +" only has an available balance of $"+ this.getTotalFunds() +", which is less than $"+ amount +"?\n");
            return;
        }
        // TODO Auto-generated method stub
        double earthDollars = this.toEarthDollars(amount);
        double newAmount = other.fromEarthDollars(earthDollars);
        this.setTotalFunds(new BigDecimal(this.getTotalFunds() - amount).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue());
        other.setTotalFunds(new BigDecimal(other.getTotalFunds() + newAmount).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue());
        System.out.println("Converting from "+this.currencyName+" to "+other.getCurrencyName() +" and initiating transfer... \n$"+ amount + this.getCurrencyName() +  "= $"+ earthDollars +" EarthDollars = "+ newAmount + " " + other.getCurrencyName() + "\n" + this.getClass().getSimpleName() + "  has a total of $"+this.getTotalFunds() +
                " " + this.getClass().getSimpleName()+"  \n" + other.getClass().getSimpleName() +" has a total of $"+ other.getTotalFunds() + " " + other.getCurrencyName() + "\n");
    }
}

Saturn.java

/**
 * @ClassName: Saturn
 * @Description: TODO
 * @Author: AndersonHJB
 * @date: 2023/2/19 10:16
 * @Version: V1.0
 * @Blog: https://bornforthis.cn
 */

import java.math.BigDecimal;

public class Saturn extends Currency {
    private String currencyName;
    private double totalFunds;

    public String getCurrencyName() {
        return currencyName;
    }

    public double getTotalFunds() {
        return totalFunds;
    }

    public void setCurrencyName(String currencyName) {
        this.currencyName = currencyName;
    }


    public void setTotalFunds(double totalFunds) {
        this.totalFunds = totalFunds;
    }

    public Saturn() {
        super();
        this.currencyName = "SaturnSilver";
    }

    public Saturn(double totalFunds) {
        this.currencyName = "SaturnSilver";
        this.totalFunds = totalFunds;
    }

    @Override
    public double toEarthDollars(double amount) {
        // TODO Auto-generated method stub
        BigDecimal SATURNtoEARTHDollarBigDecimal = new BigDecimal(amount / SATURN_SILVER);
        double returnAmount = SATURNtoEARTHDollarBigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
        return returnAmount;
    }

    @Override
    public double fromEarthDollars(double EarthDollars) {
        // TODO Auto-generated method stub
        BigDecimal SATURNFROMEARTHBigDecimal = new BigDecimal(EarthDollars).multiply(new BigDecimal(SATURN_SILVER));
        double returnAmount = SATURNFROMEARTHBigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
        return returnAmount;
    }

    @Override
    public void exchange(Currency other, double amount) {
        // TODO Auto-generated method stub
        if (amount > this.getTotalFunds()) {

            System.out.println("Uh oh - " + this.currencyName + " only has an available balance of $" + this.getTotalFunds() + ", which is less than $" + amount + "?\n");
            return;
        }
        double earthDollars = this.toEarthDollars(amount);
        double newAmount = other.fromEarthDollars(earthDollars);
        this.setTotalFunds(new BigDecimal(this.getTotalFunds() - amount).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue());
        other.setTotalFunds(new BigDecimal(other.getTotalFunds() + newAmount).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue());
        System.out.println("Converting from " + this.currencyName + " to " + other.getCurrencyName() + " and initiating transfer... \n$" + amount + this.getCurrencyName() + "= $" + earthDollars + " EarthDollars = " + newAmount + " " + other.getCurrencyName() + "\n" + this.getClass().getSimpleName() + "  has a total of $" + this.getTotalFunds() +
                " " + this.getClass().getSimpleName() + "  \n" + other.getClass().getSimpleName() + " has a total of $" + other.getTotalFunds() + " " + other.getCurrencyName() + "\n");
    }


}

test.java

/**
 * @ClassName: test
 * @Description: TODO
 * @Author: AndersonHJB
 * @date: 2023/2/19 10:25
 * @Version: V1.0
 * @Blog: https://bornforthis.cn
 */
public class test {
    public static void main(String[] args) {
        Currency mars = new Mars(100.00);
        Currency neptune = new Neptune(100.00);
        Currency saturn = new Saturn(100.00);
        System.out.println("<-- Exchanges -->");
        mars.exchange(saturn, 25.0);
        neptune.exchange(saturn, 10.0);
        saturn.exchange(mars, 122.0);
        saturn.exchange(mars, 121.0);
    }
}

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