java - 如何在不同于调用方法的另一个方法中使用方法的返回值？

Question

我是 java 的新手，偶然发现了一个问题，需要我进行货币转换并声明不同的方法:获取金额，获取转化率，进行实际转化并打印转化结果

import java.util.*;

public class Conver {
    public static void main(String[] args){
       amountToConvert();
       exchangeRate(); 
       convert();
    }

        public static double amountToConvert() {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter the amount you wish to convert...");
        double amount = input.nextDouble();
        return amount;
    }

    public static double exchangeRate(){
        Scanner input = new Scanner(System.in);
        System.out.println("Enter the currency you wish to convert from... ");
        String initialCurrency = input.next();
        System.out.println("Enter the currency you wish to convert from... ");
        String finalCurrency = input.next();
        System.out.println("How many " + initialCurrency + " makes one " + finalCurrency + "?");
        double rate = input.nextDouble();
        return rate;
    } 

    public static double convert(){
        int x = amount*rate;
        return x;
    }

    public void printResult(){
        System.out.println(x);
    }
}

Answer 1

学习在方法中使用参数。更改 convert() 方法，使其看起来像这样:

public static double convert(double amount, double rate){
    int x = amount*rate;
    return x;
}

在上面的方法中，double amount和double rate是参数。在main方法中使用变量帮助传递参数给convert():

public static void main(String[] args){
   double amount1 = amountToConvert();
   double rate1 = exchangeRate(); 
   double result = convert(amount1, rate1);
   printResult(result);
}

希望这对您有所帮助!