不兼容的类型：布尔值不能转换为双精度（错误）

Question

import javax.swing.JOptionPane;

import java.util.Scanner;

public class pay{

static Scanner sc;

public static void main (String[]args)

{
  double Regpay = 8;
  double OThour = Regpay * 1.5;
  double hours = 0;
  double gpay = Regpay * hours;
  double Totalpay = OThour + gpay;

  Scanner input = new Scanner(System.in);
  System.out.println("Normal pay for hours worked less than 40hrs will be, £8.00 per hour");
  System.out.println("If workers work more than 40hrs, their pay will be time and a half");
  System.out.println("please enter your name");
  String name = sc.nextLine();

  System.out.println("How many hours did you work this month");
  hours = sc.nextDouble();

  System.out.println("How many hours overtime did you work");
  OThour = sc.nextDouble();




  if (hours<=40){
      Totalpay = gpay;
      System.out.print("You are not entitled to overtime pay");
  }else{
      if (hours>=41)
      Totalpay = gpay + OThour >=1;   
    }
  }        
}

我在Totalpay = gpay + OThour >=1; 线上收到错误，我不知道该怎么办，我一直在尝试改变，但我一直收到同样的错误！！！！

Answer 1

您正在寻找的答案（我假设）是测试 OTHoure 是否大于 1，将其添加到 TotalPay。为此，请将 TotalPay = TotalPay + OTHours >=1 替换为

if(OTHours>=1){
    TotalPay = gPay + OTHour;
}

Answer 2

您正在组合两种不兼容的表达式类型。

Totalpay = gpay + OThour >=1;

使用运算顺序，“gpay + OThour >=1”是两个表达式：

gpay + OThour : (the sum of two doubles)

(result of gpay + OThour) >= 1  : (a boolean expression)

这个结果是一个布尔答案（真/假），它不能被解析为双精度，所以它不能存储在 TotalPay 中。

其次，您的结果不会像预期的那样 - 您正在使用的变量 (gpay) 已初始化为 0 并且永远不会更改。

Answer 3

@purpleorb 和@Jaboyc 已经解释了抛出错误的原因。我将讨论一个更全面的解决方案。

这有几个问题

1. 在获取用户输入之前查找变量的值
2. 布尔值被分配给双重问题（正如您所提到的）
3. 不必要的 if 语句结构

您可以将代码更改为如下来解决这些问题：

  Scanner input = new Scanner(System.in);
  System.out.println("Normal pay for hours worked less than 40hrs will be, £8.00 per hour");
  System.out.println("If workers work more than 40hrs, their pay will be time and a half");
  System.out.println("please enter your name");
  String name = input.nextLine();

  double hours = 0;
  System.out.println("How many hours did you work this month");
  hours = input.nextDouble();

  double Regpay = 8;
  double OThour = Regpay * 1.5;
  double gpay = Regpay * hours;
  double Totalpay = OThour + gpay;

  if (hours>40){
      Totalpay = gpay + (OThour- 1) * (hours - 40);   
  }else{
      Totalpay = gpay;
      System.out.print("You are not entitled to overtime pay");
    }

它的作用是在用户向hours 输入值后计算gpay = Regpay * hours 和Totalpay = OThour + gpay。此外，通过检查小时数是否大于 40，然后执行所需的计算，这简化了 if 语句结构。