无法得到双倍值来进行数学运算

Question

我对Java还是一个相当陌生的人，但我在这方面花了很多时间，最终我找不到一种方法来解决数学问题/转换器。当我输入weight3时，它的转换器会工作，但是weight和weight2永远不会通过。谢谢你的帮助。

import java.util.Scanner;

public class TugTeam {

    public static void main(String[] args) {

        // Create Scanner Object

        Scanner input = new Scanner(System.in);

        // Name of team

        System.out.print("The name of the team is: ");
        String name = input.nextLine();

        // Information for first person

        System.out.print("Enter the name of member 1: ");
        String member = input.nextLine();
        System.out.print("Enter the weight of member 1 in lbs (must be in decimal value): ");
        double weight = input.nextDouble();

        // Information for second person

        String person2 = input.nextLine();

        System.out.print("Enter the name of member 2: ");
        String member2 = input.nextLine();
        System.out.print("Enter the weight of member 2 in lbs (must be in decimal value): ");
        double weight2 = input.nextDouble();

        // Information for third person, truncating the Scanner after an integer
        // Otherwise the program outputs both the nextDouble and the nextLine

        String person3 = input.nextLine();

        System.out.print("Enter the name of member 3: ");
        String member3 = input.nextLine();
        System.out.print("Enter the weight of member 3 in lbs (must be in decimal value): ");
        double weight3 = input.nextDouble();

        // Output of team members names

        System.out.println("Team " + name + " Members: " + member + ", " + member2 + ", and " + member3);

        // Converter from LBS to KG

        double kilo = weight + weight2 + weight3 * 0.454;

        if (kilo > 272.16) {
            System.out.printf("The total weight of the team is %5.2f kgs and is over the maximum", kilo);
        } else {
            System.out.printf("The total weight of the team is %5.2f kgs and is under the maximum", kilo);
        }
    }
}

Answer 1

您使用的是< code>input.nextDouble()，但是您的输入为第一个人提供了像< code>100 lbs这样的整数，为第二个人提供了< code>0的整数，为第三个人提供了< code>0的整数。

确保至少输入浮点值，如 100.0 或 0.0。

或者改进您的代码以读取任何字符串，然后尝试将其转换为double，并在不工作的情况下打印一个错误。这会对用户更加友好。