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Thread: How do you make JOptions compile?

  1. #1
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    Default How do you make JOptions compile?

    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);
    Last edited by copeg; July 17th, 2011 at 09:26 AM.


  2. #2
    Super Moderator copeg's Avatar
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    Default Re: How do you make JOptions compile?

    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.

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    GirlCoder (July 19th, 2011)

  4. #3
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    Default Re: How do you make JOptions compile?

    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...

  5. The Following User Says Thank You to dlorde For This Useful Post:

    GirlCoder (July 19th, 2011)

  6. #4
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    Default Re: How do you make JOptions compile?

    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));
     
     
        }
     
    }

  7. #5
    Super Moderator Norm's Avatar
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    Default Re: How do you make JOptions compile?

    it will not compile
    Please copy and paste here the full text of the error messages.

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