Question

创建一个简单的学费计划，我陷入困境（我认为是最后的接触）。

问题是，我不确定如何计算“小时”变量，以便在所有内容保持不变的情况下。

这是我使用Java的第一年，请原谅我的坏风格。

import java.util.*;
import javax.swing.JOptionPane;

/**
The application calculates the cost of tuition for one semester at OCC.
*/

public class TuitionOCC
   {
public static void main(String[] args)
   {

   String input; 
   int residency;
   byte credits;
   int residentTuition;
   int nonTuition;
   int internationalTuition;
   int hours;
   double tuition;


   residentTuition = 82;
   nonTuition = 154;
   internationalTuition = 216;


     JOptionPane.showMessageDialog(null, "Calculate your tuition!",        "Tuition",JOptionPane.INFORMATION_MESSAGE);

    input = JOptionPane.showInputDialog("Are you a:\n" +
    "1- College District Resident\n" +
    "2- Non-Resident of College District\n" +
    "3- Out-of-State or International Student");             

     residency = Integer.parseInt(input);

     if (residency == 1)
    {


     input = JOptionPane.showInputDialog("How many credit hours are you taking?: ");

     hours = Integer.parseInt(input);
    if (hours <=0)
     JOptionPane.showMessageDialog(null,"You must enter a value of 1 or more.\n" + "Please run the program again", "Error", JOptionPane.ERROR_MESSAGE);
 } 

 else if (residency == 2)
 {

 residency = nonTuition;

  input = JOptionPane.showInputDialog("How many credit hours are you taking?: ");

     hours = Integer.parseInt(input);
  if (hours <=0)
     JOptionPane.showMessageDialog(null,"You must enter a value of 1 or more.\n" + "Please run the program again", "Error", JOptionPane.ERROR_MESSAGE);
 }
 else if (residency == 3)
 {

 residency = internationalTuition;

 input = JOptionPane.showInputDialog("How many credit hours are you taking?: ");

     hours = Integer.parseInt(input);
  if (hours <=0)
     JOptionPane.showMessageDialog(null,"You must enter a value of 1 or more.\n" + "Please run the program again", "Error", JOptionPane.ERROR_MESSAGE);
 }


else
      {
         JOptionPane.showMessageDialog(null, "You must enter a 1, 2, or 3\n" + "Please run the program again", "Error", JOptionPane.ERROR_MESSAGE);
            System.exit(0);
   }


tuition = hours * residency; 


if 
   (residency == 1)
   {  
         JOptionPane.showMessageDialog(null, hours + " hours at $ " + residentTuition + "per hour yields a tuition of " + tuition);
   }

else if 
   (residency == 2)
   {  
         JOptionPane.showMessageDialog(null, hours + " hours at $ " + nonTuition + "per hour yields a tuition of " + tuition);
   }

else if 
   (residency == 3)
   {  
         JOptionPane.showMessageDialog(null, hours + " hours at $ " + internationalTuition + "per hour yields a tuition of " + tuition);
   }



      }



}

Answer 1

如果你想让时间不变，那么你可以这样做：

input = JOptionPane.showInputDialog("How many credit hours are you taking?: ");
final hours = Integer.parseInt(input);

您还可以将JOptionPane放在if语句之上，这样就不会在每个if语句块上重新分配值。同样，您可以对代码执行此操作以缩短所有内容。

import java.util.*;
import javax.swing.JOptionPane;

/**
The application calculates the cost of tuition for one semester at OCC.
*/

public class TuitionOCC {
    public static void main (String[] args) {

        String input;
        int residency;
        byte credits;
        int residentTuition;
        int nonTuition;
        int internationalTuition;
        double tuition;


        residentTuition = 82;
        nonTuition = 154;
        internationalTuition = 216;


        JOptionPane.showMessageDialog(null, "Calculate your tuition!",        "Tuition",JOptionPane.INFORMATION_MESSAGE);

        input = JOptionPane.showInputDialog("Are you a:\n" +
        "1- College District Resident\n" +
        "2- Non-Resident of College District\n" +
        "3- Out-of-State or International Student");         

        residency = Integer.parseInt(input);

        input = JOptionPane.showInputDialog("How many credit hours are you taking?: ");
        final int hours = Integer.parseInt(input);

        if (hours <= 0) {
            JOptionPane.showMessageDialog(null,"You must enter a value of 1 or more.\n" + "Please run the program again", "Error", JOptionPane.ERROR_MESSAGE);
        }
        else {
            tuition = hours * residency; 
            if (residency == 1) {
                JOptionPane.showMessageDialog(null, hours + " hours at $ " + residentTuition + "per hour yields a tuition of " + tuition);
            } else if (residency == 2) {
                JOptionPane.showMessageDialog(null, hours + " hours at $ " + nonTuition + "per hour yields a tuition of " + tuition);
            } else if (residency == 3) {
                JOptionPane.showMessageDialog(null, hours + " hours at $ " + internationalTuition + "per hour yields a tuition of " + tuition);
            } else {
                JOptionPane.showMessageDialog(null, "You must enter a 1, 2, or 3\n" + "Please run the program again", "Error", JOptionPane.ERROR_MESSAGE);
                System.exit(0);
            }
        }
    }
}

使用JOptionPane和if / if else需要多个答案

1 个答案: