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input multiple strings using JOptionPane.showInputDialog

Paul LaBrier

Joined: Apr 08, 2002
Posts: 21
I am pretty sure the answer to my question will be NO, but I will ask anyway.
For a homework assignment in my Into to Java Class I have to write a simple program that will take user input in the for of a string for gallons and miles driven and compute the MPG. I have the program doing what I need it to for the assignment, but I would like to go a small step further. I do not like the fact that it is using two dialog boxes to input the two numbers. Is there any way, still using "JOptionPane.showInputDialog" ( or something close to it) to request both strings within the same dialog box? I know that I could make a custom dialog box, but that is well beyond the scope of the assignment.
Below is a snippet of code showing what I am currently doing.
// input new value for miles and
// convert from String to int
inputMiles = JOptionPane.showInputDialog(
"Enter miles (-1 to quit):" );
miles = Integer.parseInt( inputMiles );
// read second number from user as String
inputGallons = JOptionPane.showInputDialog(
"Enter gallons:" );
Again, I have the assignment done, just looking to improve it.
Paul LaBrier
Manfred Mueller

Joined: Jul 18, 2002
Posts: 10
Hi Paul,
if you do not insist on two input fields, you might want to use this solution: prompt the user to enter both the gallons and the miles into the single input field with a separator between the both values (a blank character will do). Then let a java.util.StringTokenizer object parse the input string appropriately. This will do (although the custom dialog you mentionend would be a more elegant solution ).
And here's the code snippet:
String input = JOptionPane.showInputDialog("Enter <gallons>/<miles> (leave field empty to quit):" );
// check for quitting condition
if (input.length() == 0)
StringTokenizer st = new StringTokenizer(input, " /,|"); // allow for several separators
if (st.hasMoreElements())
inputGallons = (String)st.nextElement();
if (st.hasMoreElements())
inputMiles = (String)st.nextElement();
// handle possible errors (miles missing, wrong separator...)
Just don't forget to
import java.util.StringTokenizer;
Regards and have fun with Java,
sharad sinhaabc

Joined: Jul 30, 2009
Posts: 1
hi friend
taking multiple fields in dilog box is a feature

JTextField jf = new JTextField();
String user1 =javax.swing.JOptionPane.showInputDialog(null,jf ,"PLEASE GIVE YOUR INPUT", JOptionPane.OK_CANCEL_OPTION);
Maneesh Godbole
Saloon Keeper

Joined: Jul 26, 2007
Posts: 10815

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