SammysRentalPrice JOptionPane

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• 列表项目

我在一个Java类，我已经被提示做一个实验室从这本书。

Sammy‘s Seashore向游客出租皮划艇、独木舟、沙滩椅和雨伞等海滩设备。编写一个程序，提示用户租用一件体育器材的分钟数。计算租金为每小时$40加上每增加一分钟$1。(您可能已经推测过，此比率存在逻辑缺陷，但目前，请按此处所述计算速率。在阅读了关于决策的章节之后，你可以解决这个问题。)用您在第1章SammysMotto2类中创建的边框显示Sammy的座右铭，然后显示小时、分钟和总价。将文件保存为SammysRentalPrice.jav

现在我试着用JOptionPane来做这件事，但是我不知道从我拥有的东西到哪里去。

package sammysrentalprice;

import javax.swing.JOptionPane;

public class SammysRentalPrice
{

   
    public static void main(String[] args) 
    {
       final int RENT_PER_HOUR = 40;
       final int RENT_PER_ADDITIONAL_MINUTE = 1;
       final int MINUTES_IN_AN_HOUR = 60;
        
        int minutesRented;
        int hoursRented;
        int additionalMinutes;
        int total;
        
        
       JOptionPane.showMessageDialog(null,
               "SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS\n"
               + "SS                                                                        SS \n"
               + "SS    Sammy's makes it fun in the sun.      SS \n"
                + "SS                                                                        SS \n"
                       + "SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS\n");
        
       
    }
   
    
}

Example of what we should use (This was the lab before the one we are on)
 
package chap2.carlyseventprice;

import javax.swing.JOptionPane;

public class Chap2CarlysEventPrice 
{
    public static void main(String[] args) 
    {
        final int PRICE_PER_PERSON = 35;
        final int LARGE_EVENT = 50;
        
        String strNumOfGuests;
        int numOfGuests;
        int totalPrice;
                
        strNumOfGuests = JOptionPane.showInputDialog(null,
                "Enter the number of guests", "Guest Entry",
                JOptionPane.INFORMATION_MESSAGE);
        numOfGuests = Integer.parseInt(strNumOfGuests);
        
        totalPrice = numOfGuests * PRICE_PER_PERSON; 
        
       JOptionPane.showMessageDialog(null,
               "*****************************************************\n"
              + "* Carly's makes the food that makes it a party! *\n"
              + "*****************************************************");
       JOptionPane.showMessageDialog(null,
               "Number Of Guests: " + numOfGuests
                + "\nPrice per Guest: " + PRICE_PER_PERSON
                +"\nTotal Price:      $" + totalPrice
                + "\nLarge event? " + (numOfGuests >= 50));
    }

Answer 1

首先，您需要更改它以显示输入对话框，而不是消息对话框。这可以通过将showMessageDialog更改为showInputDialog来实现。

请记住，showInputDialog返回一个字符串，因此您必须将其解析为int。

然后你就可以做计算了。

代码应该如下所示：

public static void main(String[] args) 
{
    final int RENT_PER_HOUR = 40;
    final int RENT_PER_ADDITIONAL_MINUTE = 1;
    final int MINUTES_IN_AN_HOUR = 60;
    
    int minutesRented;
    int hoursRented;
    int additionalMinutes;
    int total;
    
    String strNumberOfMinutes = JOptionPane.showInputDialog(null,
            "Enter the number of minutes", "Number of Minutes",
            JOptionPane.INFORMATION_MESSAGE);
    
    JOptionPane.showMessageDialog(null,
              "SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS\n"
            + "SS                                                                        SS \n"
            + "SS    Sammy's makes it fun in the sun.      SS \n"
            + "SS                                                                        SS \n"
            + "SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS\n");
    
    minutesRented = Integer.parseInt(strNumberOfMinutes);
    
    hoursRented = minutesRented / MINUTES_IN_AN_HOUR;
    additionalMinutes = minutesRented - (hoursRented*MINUTES_IN_AN_HOUR);
    
    total = additionalMinutes*RENT_PER_ADDITIONAL_MINUTE + hoursRented*RENT_PER_HOUR;
    
    JOptionPane.showMessageDialog(null, 
              "Hours: "+hoursRented+"\n"
            + "Min: "+additionalMinutes+"\n"
            + "Total Cost: "+total);
}

Answer 2

既然您使用的是swing，为什么不创建一个扩展JFrame或JPanel并添加JScrollPane或JTextArea的类？还添加一个按钮来关闭窗格，就像它在JOptionPane中应该的那样。

调用main方法中的类。请注意，在JOptionPane中显示许多信息并不是最佳实践。