How do you make JOptions compile?

**GirlCoder** · July 16th, 2011, 08:57 PM

Here is my code so far to ask users to enter lastnames of three triathletes and their seconds. However, the code will not compile. Thank you so much!

import javax.swing.JOptionPane;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class TriathletePanel
{
    String str, lasNameStr, secondStr, result;
    int num, again, lastName;
 
    lastNameStr = JOptionPane.showingInputDialog ("Enter Last Name: ");
    lastName = Char.parsechar(lastNameStr);
    str = str.toUpperCase();
    str = str.replaceAll("\\W","");
    secondStr = JOptionPane.showingInputDialog ("Enter Seconds: ");
    num = Integer.parseInt(secondStr);
 
    lastNameStr = JOptionPane.showingInputDialog ("Enter Last Name: ");
    lastName = Char.parsechar(lastNameStr);
    str = str.toUpperCase();
    str = str.replaceAll("\\W","");
    secondStr = JOptionPane.showingInputDialog ("Enter Seconds: ");
    num = Integer.parseInt(secondStr);
 
    lastNameStr = JOptionPane.showingInputDialog ("Enter Last Name: ");
    lastName = Char.parsechar(lastNameStr);
    str = str.toUpperCase();
    str = str.replaceAll("\\W","");
    secondStr = JOptionPane.showingInputDialog ("Enter Seconds: ");
    num = Integer.parseInt(secondStr);

**copeg** · July 17th, 2011, 09:28 AM

For future reference, please wrap your code in the code tags and please post the full error message you receive. As is, your class is not enclosed in matching curly braces.

**dlorde** · July 17th, 2011, 11:37 AM

If nothing else, you'll be getting a NullPointerException because you keep doing this:

str = str.toUpperCase();
str = str.replaceAll("\\W","");

The problem is, 'str' is never initialized, so is always null...

**GirlCoder** · July 19th, 2011, 01:36 PM

I am new to Java. Sorry for the confusion. Here is the full code and it is supposed to look like this but it will not compile. I am not sure why.

import javax.swing.JOptionPane;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Scanner;
import java.text.DecimalFormat;
 
public class TriathletePanel extends JPanel
{  
    public static void main (String[] args)
    {
  String lastNameStr, secondStr, result;
     int num, again, lastName, seconds, Kmh;
     Scanner scan = new Scanner(System.in);
 
    for (lastName = 0; lastName <= 3; lastName ++)
    {
    lastNameStr = JOptionPane.showInputDialog ("Enter Last Name: ");
    lastName = Integer.parseInt(lastNameStr);
    secondStr = JOptionPane.showInputDialog ("Enter Seconds: ");
    num = Integer.parseInt(secondStr);
 
    result = "Triathlete" + lastName + "Seconds" + num;
 
   JOptionPane.showMessageDialog(null, result);
  }
        seconds = num;
        Kmh = 10000/seconds;
 
        DecimalFormat fmtK = new DecimalFormat("0.##");
        DecimalFormat fmtS = new DecimalFormat("###,###.##");
        String output = fmtK.format(Kmh + seconds);
 
 
}
 
   private JLabel inputLabel, outLabel, resultLabel, NameListener, ButtonListener;
 
    public TriathletePanel()
        {
        setBackground (Color.blue);
        setPreferredSize(new Dimension(150, 200));
        setLayout (new GridLayout (5, 3));
        setBorder ( BorderFactory.createLineBorder (Color.red, 2));
 
 
    }
 
}

**Norm** · July 19th, 2011, 03:19 PM

it will not compile

Please copy and paste here the full text of the error messages.

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