Question

所以我是Java的新手，大约一个月前，我们才在我的编程课上开始使用这种语言。无论如何，我们现在正在使用重载方法（上周刚刚开始使用方法），而在比较重载方法中的return语句的值时遇到了麻烦。我的意图是在main方法的if语句中对它们进行比较。我敢肯定答案很简单，但是我无法在教科书或在线上找到相关信息。抱歉，草率的缩进使我无法使用该网站上的功能，这是我第一次使用它。将不胜感激！这是程序：

import java.util.Scanner;

public class pizzaCalculation {
       public static void main(String[] args){
           //create scanner
           Scanner i = new Scanner(System.in);
           //create sentinel while loop, initiate priceperinch for both pizzas
           int sentinel = 1;
           //create while loop
           while(sentinel != 0){

               //create input for round pizza
               System.out.println("What is the price of the round pizza?");
               double priceRound = i.nextDouble();
               System.out.println("What is the radius?");
               double radius = i.nextDouble();
               pizzaPrice(radius, priceRound);

               System.out.println("What is the price of the rectangular pizza?");
               double priceRect = i.nextDouble();
               System.out.println("What is the width and length of the rectangular pizza?");
               double width = i.nextDouble();
               double length = i.nextDouble();
               pizzaPrice();

               //create if statement to determine best deal
               if (pricePerInchRound > pricePerInchRect){
                   System.out.println("The best deal is the round pizza which is $"+pricePerInchRound);
               }else{
                   System.out.println("The best deal is the rectangular pizza is $"+pricePerInchRect);
               }

               //ask if user would like to do again
               System.out.println("Would you like to do another calculation? Enter 1 for yes and 0 for no.");
               sentinel = i.nextInt();
           }
        }

        public static double pizzaPrice(double num1, double priceRound){
            Scanner i = new Scanner(System.in);
            //this is for round pizza
            double areaRound = Math.PI * num1 * num1;
            double pricePerInchRound = priceRound / areaRound;
           return pricePerInchRound;
        }

        public static double pizzaPrice(double num1, double num2, double priceRect){
            //this is for rectangular pizza
            //create scanner
            Scanner i = new Scanner(System.in);
            double areaRect = num1 * num2;
            double pricePerInchRect = priceRect / areaRect;
            return pricePerInchRect;
        }
}

Answer 1

所以有几个问题：

您需要像这样将参数传递到pizzaPrice()的第二次调用

pizzaPrice(width, length, priceRect);
您需要将方法调用的结果存储在变量中，例如

pricePerInchRound = pizzaPrice(a, b);

pricePerInchRect = pizzaPrice(a, b, c);

Answer 2

您正在调用pizzaPrice()，但需要将结果值存储在变量中，以便以后使用（并传递正确的参数）。

double pricePerInchRound = pizzaPrice(radius, priceRound);

和...

double pricePerInchRect = pizzaPrice(width, length, priceRect);

此外，请小心命名更好的方法参数-num1，num2的描述性不是很好。您本可以使用宽度，长度。

比较if语句中两个重载方法的返回值（在main方法中）

2 个答案: