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How to assign JOptionpane as a double

 
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How to assign JOptionpane as a double
icde4fn
22 Aug, 2008 - 08:20 PM
Post #1

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Joined: 22 Aug, 2008
Posts: 5
So im making a km to Nautical miles converter. I managed to do it useing keyboard reader but want to do it
using JOptionpane. I cant figure out how to have the user input a double. I know there are a few more errors but thats the big issue right now.


CODE
/*
8/22/08
km-naut */

import javax.swing.JOptionPane;
import TerminalIO.KeyboardReader;


public class nauticalmilesandjo

{
public static void main(String [] args)
{
JOptionPane.showInputDialog("Enter metric unit ");

double nauticalmiles;





nauticalmiles =(km*5400.0)/10000.0;

JOptionPane.showMessageDialog(null,"the equivilent in nautical miles is ");
}
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fsloke
RE: How To Assign JOptionpane As A Double
22 Aug, 2008 - 11:00 PM
Post #2

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Joined: 19 Dec, 2007
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The answer should be....

CODE

import javax.swing.JOptionPane;

public class nauticalmilesandjo
{  
public static void main(String [] args)
{
String km = JOptionPane.showInputDialog("Enter metric unit ");
double nauticalmiles;
nauticalmiles =(Double.parseDouble(km)*5400.0)/10000.0;
JOptionPane.showMessageDialog(null,"the equivilent in nautical miles is "+ nauticalmiles);
}
}


Every value take from JOptionPane is a String type. You should parse it to Double. SO you can do your calculation...

Understood?
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icde4fn
RE: How To Assign JOptionpane As A Double
23 Aug, 2008 - 11:24 AM
Post #3

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Joined: 22 Aug, 2008
Posts: 5
QUOTE(fsloke @ 23 Aug, 2008 - 12:00 AM) *

The answer should be....

CODE

import javax.swing.JOptionPane;

public class nauticalmilesandjo
{  
public static void main(String [] args)
{
String km = JOptionPane.showInputDialog("Enter metric unit ");
double nauticalmiles;
nauticalmiles =(Double.parseDouble(km)*5400.0)/10000.0;
JOptionPane.showMessageDialog(null,"the equivilent in nautical miles is "+ nauticalmiles);
}
}


Every value take from JOptionPane is a String type. You should parse it to Double. SO you can do your calculation...

Understood?


yeah thanks man smile.gif
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