Help with program (sorry im a noob)

[baden]

I can't figure out why 'display' in the main method wont show in my output. Any help will be appreciated.

   import javax.swing.JOptionPane;
    public class lab006 {
 
 
 
       public static void main  (String [ ] args) {
         int numRoom;
         numRoom = number();
         String display="";
         int numberOfRooms = 0;
         int length=0;
         int width=0;
         String name="";
         int area=0;
         int totalArea=0;
 
         for(int i = 0; i < numRoom; i++) {
 
            name = JOptionPane.showInputDialog("Enter name of room");
 
            do {
               width =Integer.parseInt(JOptionPane.showInputDialog("The width of " + name + " --in feet")); 
            } while(width <= 0 || width >= 30);     
            do {
               length =Integer.parseInt(JOptionPane.showInputDialog("The length of " + name + " --in feet")); 
            } while(length <= 0 || length >= 30);     
            area=length*width;
            totalArea+=area;
 
            display+= name + area + "\n\n\n";
         }
         finalOutput(display, totalArea);
 
      }
 
 
       public static int number () {
         int numberOfRooms=0;
         do {
            numberOfRooms = Integer.parseInt(JOptionPane.showInputDialog("How many rooms in the house?"));//display message box to get the number of rooms
         } while (numberOfRooms >= 10 || numberOfRooms <= 0);
         return numberOfRooms;
      }
 
 
       public static void finalOutput(String output, int totalArea)
      {
 
         output="Room          |        Area\n";
 
         output += "Total Square Footage: " + totalArea  + " square feet";
 
         JOptionPane.showMessageDialog(null, output);
 
      }
   }

[JosAH]

You carefully build up the display string here:

 
            display+= name + area + "\n\n\n";

Finally you pass it to yout finalOutput method where you do this:

       public static void finalOutput(String output, int totalArea)
      {
 
         output="Room          |        Area\n";

This means that you simply discard the previous content of the string. Get it?

kind regards,

Jos

[r035198x]

I can't figure out why 'display' in the main method wont show in my output. Any help will be appreciated.

import javax.swing.JOptionPane;
public class lab006 {
 
 
 
public static void main (String [ ] args) {
int numRoom;
numRoom = number();
String display="";
int numberOfRooms = 0;
int length=0;
int width=0;
String name="";
int area=0;
int totalArea=0;
 
for(int i = 0; i < numRoom; i++) {
 
name = JOptionPane.showInputDialog("Enter name of room");
 
do {
width =Integer.parseInt(JOptionPane.showInputDialog("The width of " + name + " --in feet")); 
} while(width <= 0 || width >= 30); 
do {
length =Integer.parseInt(JOptionPane.showInputDialog("The length of " + name + " --in feet")); 
} while(length <= 0 || length >= 30); 
area=length*width;
totalArea+=area;
 
display+= name + area + "\n\n\n";
}
finalOutput(display, totalArea);
 
}
 
 
public static int number () {
int numberOfRooms=0;
do {
numberOfRooms = Integer.parseInt(JOptionPane.showInputDialog("How many rooms in the house?"));//display message box to get the number of rooms
} while (numberOfRooms >= 10 || numberOfRooms <= 0);
return numberOfRooms;
}
 
 
public static void finalOutput(String output, int totalArea)
{
 
output="Room | Area\n";
 
output += "Total Square Footage: " + totalArea + " square feet";
 
JOptionPane.showMessageDialog(null, output);
 
}
}

1.)Please use code tags when posting code
2.)

output="Room | Area\n";
 

sets the variable output to ="Room | Area\n". Any value that was previously in output is thrown away.

[baden]

I get what you guys are saying but how would I go about fixing it.

[JosAH]

I get what you guys are saying but how would I go about fixing it.

How about changing this line:

output="Room          |        Area\n";

to this:

output="Room          |        Area\n"+output;

kind regards,

Jos

[baden]

Thanks Got IT!