Question

“程序应首先询问酒店有多少房间。使用循环计算每个房间的矩形区域（SQF）。显示每个房间的SQF和房产的总SQF。”

所以，我终于让我的代码工作了，除了我不能得到一件事：问题的例子：假设我进入2个房间，然后对于第一个房间我放入10 x 2，这是20的区域，然后对于第二个房间我放8 x 2，这是16。好吧当代码在最后显示信息时，它只显示16作为两个房间的区域，我假设这是因为这是计算的最后一个区域。在最后它显示总面积为36所以我知道我接近正确的道路。但我不能为我的生活弄清楚这一点。

import javax.swing.JOptionPane;
public class PropertySF
{
public static void main(String[] args)
{

   double length = 0,    // The room's length
          width = 0,     // The room's width
          area = 0;      // The room's area
   int numRoom;          // for number of rooms
   double roomSF = 0;    // square footage for each room
   double totalSF = 0;   // Total square footage



  // Get the amount of rooms
  numRoom = getRooms();

  // Get the rooms dimentions from the user.
  for (double maxRoom = 1; maxRoom <= numRoom; maxRoom++)
  {
      length = getLength();

      // Get the rooms's width from the user.
      width = getWidth();

      // Get the rooms's area.
      area = getArea(length, width);
      totalSF += area;
 }

  // Display the room data.
  displayData(numRoom, totalSF, area);

  System.exit(0);
}

public static int getRooms()
 {
   //See CL 5-10 Page 298
   String input;        //For input
   //get input from user
   input = JOptionPane.showInputDialog("Enter the number of rooms in the 
                                         the house: "); //Line 37
   return Integer.parseInt(input); //Line 45- 48
  }

/**
*The getLength prompts user for the length of the room
*@return value entered by user.
*/
public static double getLength()
{
   //See CL 5-10 Page 298
   String input;        //For input
   //get input from user
   input = JOptionPane.showInputDialog("Enter the length of the room:");
   return Double.parseDouble(input); //Line 45- 48
}

/**
*The getWidth prompts user for the Width of the room
*@return value entered by user.
*/
public static double getWidth()
{
   //See CL 5-10 Page 298
   String input;        //For input
   //get input from user
   input = JOptionPane.showInputDialog("Enter the width of the room:");
   return Double.parseDouble(input); //Line 45-48
} 

/**
* The getArea method will calculate the room's area
* @param length the room's length
* @param with the room's width
* @return the area of the room
*/
public static double getArea(double length, double width)
{
   return length * width;
}

/**
* The displayData method displays the rooms data.
* 
*/

public static void displayData(double numRoom,
                              double totalSF,
                              double area)
{
   for (double maxRoom  = 1; maxRoom <= numRoom; maxRoom++)
   {
   JOptionPane.showMessageDialog(null,
     String.format("The Square footage for room %f is %f,\n" +
                                "The total SQF is: %f \n", maxRoom, area,
 totalSF));
   }                             
 }

}

Answer 1

是的，area只被传递到displayData函数一次，因此循环中只有一个值。一种可能的解决方案是传入一个区域数组，然后循环通过房间，但我认为更好的解决方案是在displayData中一次只显示一个房间（所以从displayData中删除循环，然后移动函数调用main中的循环）并将totalSF显示移动到另一个函数（如果你不想显示totalSF的运行总数）。

Answer 2

可能的解决方案是将区域定义为数组或list（如果大小未知），将值存储在数组中并显示它。虽然有几种方法可以做到这一点。

如何在for循环中更改之前显示该值

2 个答案: