Setting a Range

[Tony Spedaliere]

i have an input that request a 3-digit number. I want it to be within a range. How can i set a range for the input?

Thanks,
ToDi1010

[Layne Lund]

You probably need come up with the logic to implement this. I can't think of anything in the Java API that will implement this directly. What do you want the program to do if the user enters an "invalid" number? From there you should come up with some sequence of steps to make this happen. At first, don't worry about writing it in Java. Most people find it more natural to explain the steps to take in their native language and then translating that into the programming language they are using.

Also, can you explain a little more about your program so we can assist you further? Mostly I am interested whether this is a console application or a GUI?

So once you've answered these questions, please post some more details about what you have done to try to solve this. I'm sure someone here will be more than happy to help fill in any details you need.

Keep coding!

Layne

[Dirk Schreckmann]

Welcome to JavaRanch, Tony!

Show us yer code, pardner. It'll help folks 'round these parts to nudge you in the right direction.

When posting code, please be sure to surround the code with the [code] and [/code] UBB Tags. This will help to preserve the formatting of the code, thus making it easier to read and understand.

[Tony Spedaliere]

package dawson111.labExercises;

import javax.swing.*;

public class TelephoneNumber
{
public static void main(String[] args)
{
//variable declarations
String inputString;
int firstThree > 221; //Beginning of Range
int lastFour < 993; //End of Range

//Accept the required data
inputString =
JOptionPane.showInputDialog("Enter the first three digits:");
firstThree = Integer.parseInt(inputString);
inputString =
JOptionPane.showInputDialog("Enter the last four digits:");
lastFour = Integer.parseInt(inputString);


//Display the output
System.out.println("************** Telephone Number ****************");
System.out.println();
System.out.println("Telephone Number: (514)" + firstThree +"-"+ lastFour);

}//end main method
}//end Average class

[Dirk Schreckmann]

(Clearing throat...)

Originally posted by Dirk Schreckmann:
When posting code, please be sure to surround the code with the [code] and [/code] UBB Tags. This will help to preserve the formatting of the code, thus making it easier to read and understand.

Note that you can edit your own posts. Just click on the icon that looks like a piece of paper above the post.
[ September 22, 2004: Message edited by: Dirk Schreckmann ]

[Dirk Schreckmann]

It occurs to me that you could be thinking about doing one of a couple different things.

First Scenario: After the user submits data through the dialog box, your program examines the input data. If the data is not of the proper format or not within the correct range, your program then perhaps lets the user know of the mistake, and requests new input. This process would repeat until valid data were input.

Second Scenario: The user is only able to submit proper data to begin with. The input component simply wouldn't let the user input invalid data.

So, which are you wanting to achieve? (Sometimes, I like to pick the easier-to-implement solution.)

[Dirk Schreckmann]

Moving this to the Swing / AWT / SWT / JFace forum...

[Michael Dunn]

This might be one way (not sure how you wanted lastFour - is 0001 invalid?)

import javax.swing.*;
class Testing
{
  public Testing()
  {
    int firstThree = 0;
    while(firstThree < 222 || firstThree > 999)
    {
      firstThree = Integer.parseInt(JOptionPane.showInputDialog("Enter the first three digits (222 to 999):"));
    }
    int lastFour = 0;
    while(lastFour < 1000 || lastFour > 9999)
    {
      lastFour = Integer.parseInt(JOptionPane.showInputDialog("Enter the last four digits (1000 to 9999):"));
    }
    JOptionPane.showMessageDialog(null,"Telephone number = "+firstThree+"-"+lastFour);
    System.exit(0);
  }
  public static void main(String[] args){new Testing();}
}