java - 代码格式、结构、一致性

Question

您好，我是一名初学者，目前正在尝试学习 java 编程。课本上的问题:

编写一个程序来帮助人们决定是否购买混合动力汽车。你的程序的输入应该是:•新车的成本•预计每年行驶里程•预计汽油价格 •每加仑英里数的效率•5年后预计转售值(value)

计算拥有这辆车五年的总成本。 (为简单起见，我们不会考虑融资成本。)从网上获取新车和二手混合动力车以及类似汽车的实际价格。使用今天的汽油价格和每年 15,000 英里的里程运行您的程序两次。包含伪代码，程序就会根据您的作业运行。

我的问题:我的代码正确，我的程序运行完美。我主要关心的是如何以专业的方式呈现这一点。我如何专业地构建它，我必须做什么才能发布它(例如)。我正在努力养成组织和整齐地呈现我的代码的习惯。任何建议都会有帮助，谢谢!

public class car
{



public static void main(String[] args)

{

    Scanner in = new Scanner(System.in);
    System.out.println("Car Model: ");
    String carModel = in.nextLine();
    System.out.print("Cost of Car: ");
    int costOfCar = in.nextInt();
    System.out.print("The estimated miles driven per year: ");
    int milesDriven = in.nextInt();
    System.out.print("The estimated gas price: ");
    int gasPrice = in.nextInt();
    System.out.print("Efficiency in miles per gallon: ");
    int milesPerGallon = in.nextInt();
    System.out.print("Estimated resale value after 5 years: ");
    int retailValue = in.nextInt();



    double carEfficiency = (double) gasPrice / milesPerGallon;
    double milesDrivenCost = (double) milesDriven * carEfficiency * 5; //5 years of driving
    double retailValueInFiveYears = retailValue;
    double carUseLoss = costOfCar - retailValueInFiveYears;
    double totalCost = carUseLoss + milesDrivenCost;
    System.out.print(carModel + " will cost you after 5 years: ");
    System.out.format(" %,d%n", Math.round(totalCost));

    }
 }

Answer 1

1. 我希望这不是您真正的缩进。
2. 使用 Java 命名约定。特别是，car 类应该是“Car”。
3. 我本来想添加一些注释，但变量名称非常具有描述性。
4. 将 JavaDoc 注释添加到类和 main 方法中。
5. 始终明确关闭资源。
6. 用户可能想要输入多个带小数的输入。使用double代替int。扫描仪也将接受不带小数的数字。
7. 也许您可以包含生成的 JavaDoc HTML 输出。

Java代码:

import java.util.Scanner;

/**
 * Computes a car's 5-year cost of ownership.
 * Usage:
 *    java Car
 * 
 * @author Mario Rossi
 */
public class Car {

    /**
     * Computes a car's 5-year cost of ownership.
     * 
     * @param args  Not used.  
     */
    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);
        System.out.println("Car Model: ");
        String carModel = in.nextLine();
        System.out.print("Cost of Car: ");
        double costOfCar = in.nextDouble();
        System.out.print("Estimated miles driven per year: ");
        double milesDriven = in.nextDouble();
        System.out.print("Estimated gas price in $ per gallon: ");
        double gasPrice = in.nextDouble();
        System.out.print("Efficiency in miles per gallon: ");
        double milesPerGallon = in.nextDouble();
        System.out.print("Estimated resale value after 5 years: ");
        double retailValueInFiveYears = in.nextDouble();
        in.close();

        double carEfficiency = gasPrice / milesPerGallon;
        double milesDrivenCost = milesDriven * carEfficiency * 5; //5 years of driving
        double carUseLoss = costOfCar - retailValueInFiveYears;
        double totalCost = carUseLoss + milesDrivenCost;
        System.out.print(carModel + " will cost you after 5 years: ");
        System.out.format(" %,.2f%n", totalCost );
    }
}