Question

我只是在学习Java，阅读书中的教程＆＃34; Java如何编程＆＃34; Deitel和Deitel，请原谅我正在犯的任何基本错误。我理解我的方法可能不是最好的，但我希望能够改进这一点。

我的问题是我相信我错误地构建了我的程序。执行程序时，都会输出IF和ELSE选项。

如果有人能告诉我为什么两个选项都在执行，那将非常感激

Deepend

package controlStatments;
import java.util.Scanner;

public class Review_4_20 
{
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);

        //Declare Variables
        double employeeOneRate;
        double employeeOneHours;
        double employeeTwoRate;
        double employeeTwoHours;
        double employeeThreeRate;
        double employeeThreeHours;
        int calculator;
        double employeeOneTotalPay;
        double employeeOneNormalPay;
        double employeeOneTotalPayOverTime;
        double overTimeRate;

        //Initiate Variables
        employeeOneRate = 0;
        employeeOneHours = 0;
        employeeTwoRate = 0;
        employeeTwoHours = 0;
        employeeThreeRate = 0;
        employeeThreeHours = 0;
        calculator = 0;
        employeeOneTotalPay = 0;
        employeeOneTotalPayOverTime = 0;
        overTimeRate = 1.5; 
        employeeOneNormalPay = 0;

        //Create While Loop
        while (calculator != -1)
        {   
            //Prompt user to input details
            System.out.print("\n\nPlease input the first employees rate");
            employeeOneRate =input.nextDouble();

            System.out.print("Please input the first employees Hours");
            employeeOneHours =input.nextDouble();

            if (employeeOneHours <= 40)
            {
                employeeOneTotalPay = employeeOneHours * employeeOneRate;
                System.out.printf("\nNormal time pay is: %.2f", employeeOneTotalPay);
            }
            else 
                employeeOneNormalPay = employeeOneRate * 40;
            employeeOneTotalPayOverTime = (employeeOneHours - 40) * (employeeOneRate * overTimeRate) + employeeOneNormalPay;                            
            System.out.printf("\n\nTotal Pay including Overtime is: %.2f", employeeOneTotalPayOverTime);
        }
    }
}

Answer 1

您忘记了其他声明中的括号。

我想它应该是这样的：

    if (employeeOneHours <= 40)
    {
        employeeOneTotalPay = employeeOneHours * employeeOneRate;
        System.out.printf("\nNormal time pay is: %.2f", employeeOneTotalPay);
    }
    else {
        employeeOneNormalPay = employeeOneRate * 40;
        employeeOneTotalPayOverTime = (employeeOneHours - 40) * 
                (employeeOneRate * overTimeRate) + employeeOneNormalPay;                                
        System.out.printf("\n\nTotal Pay including Overtime is: %.2f", employeeOneTotalPayOverTime);
    }

如果没有设置括号，则第一行包含在IF / ELSE语句中。

Answer 2

括号内的语句，例如if，else if，else以及循环只会在后面没有括号的情况下立即执行行。

所以，你的陈述：

if (employeeOneHours <= 40) { employeeOneTotalPay = employeeOneHours * employeeOneRate; System.out.printf("\nNormal time pay is: %.2f", employeeOneTotalPay); } else employeeOneNormalPay = employeeOneRate * 40; employeeOneTotalPayOverTime = (employeeOneHours - 40) * (employeeOneRate * overTimeRate) + employeeOneNormalPay; System.out.printf("\n\nTotal Pay including Overtime is: %.2f", employeeOneTotalPayOverTime);

总是乘以employeeOneNormalPay。

将其更改为：

if (employeeOneHours <= 40) { employeeOneTotalPay = employeeOneHours * employeeOneRate; System.out.printf("\nNormal time pay is: %.2f", employeeOneTotalPay); } else { employeeOneNormalPay = employeeOneRate * 40; employeeOneTotalPayOverTime = (employeeOneHours - 40) * (employeeOneRate * overTimeRate) + employeeOneNormalPay; System.out.printf("\n\nTotal Pay including Overtime is: %.2f", employeeOneTotalPayOverTime); }

Answer 3

更改

if (employeeOneHours <= 40)
        {
            employeeOneTotalPay = employeeOneHours * employeeOneRate;
            System.out.printf("\nNormal time pay is: %.2f", employeeOneTotalPay);
        }
        else 
            employeeOneNormalPay = employeeOneRate * 40;
        employeeOneTotalPayOverTime = (employeeOneHours - 40) * (employeeOneRate * overTimeRate) + employeeOneNormalPay;                            
        System.out.printf("\n\nTotal Pay including Overtime is: %.2f", employeeOneTotalPayOverTime);

使用：

if (employeeOneHours <= 40)
        {
            employeeOneTotalPay = employeeOneHours * employeeOneRate;
            System.out.printf("\nNormal time pay is: %.2f", employeeOneTotalPay);
        }
        else 
       {
            employeeOneNormalPay = employeeOneRate * 40;
        employeeOneTotalPayOverTime = (employeeOneHours - 40) * (employeeOneRate * overTimeRate) + employeeOneNormalPay;                            
        System.out.printf("\n\nTotal Pay including Overtime is: %.2f", employeeOneTotalPayOverTime);
}

在Java中的While循环中错误地执行“if”和“else”

3 个答案: