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Thread: Applet: Calculated variable can't be displayed

  1. #1
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    Default Applet: Calculated variable can't be displayed

    Hello guys,
    i have started learning java lately, and a tutorial said creating a dice program would be a good idea. After i have done this i kinda wanted to "advance" a little. So I have no syntax errors at all, but the program just doesnt spit out anything. I would greatly appreciate help. (Some variables are in german, but i dont think that will stop anyone from helping me! :) )
    import java.applet.*;
    import java.awt.*;
    import java.awt.event.*;
     
    /**
     * Klasse randomnumberco
     * @author (iTTerror)
     * @version (1)
     */
    public class randomnumberco extends Applet implements ActionListener
    {
        Button knopf = new Button("Würfeln!");
        int x = 0;
        int[] c = new int[6];
        Label ausgabe = new Label();
        Label zahl1 = new Label();
        Label zahl2 = new Label();
        Label zahl3 = new Label();
        Label zahl4 = new Label();
        Label zahl5 = new Label();
        Label zahl6 = new Label();
        public void init()
        {
               add(knopf);
               knopf.addActionListener(this);
               add(ausgabe);
               add(zahl1);
               add(zahl2);
               add(zahl3);
               add(zahl4);
               add(zahl5);
               add(zahl6);
               c[0] = 0;
               c[1] = 0;
               c[2] = 0;
               c[3] = 0;
               c[4] = 0;
               c[5] = 0;
         }
           public void actionPerformed(ActionEvent e)
           {
               x = (int) (Math.random()*7);      
               while(x==1)
               {
                   c[0]=c[0]++;
                }
                while(x==2)
               {
                   c[1]=c[1]++;
                }
                while(x==3)
               {
                   c[2]=c[2]++; 
                }
                while(x==4)
               {
                   c[3]=c[3]++;
                }
                while(x==5)
               {
                   c[4]=c[4]++;
                }
                while(x==6)
                {
                   c[5]=c[5]++;
                }
                ausgabe.setText("" + x);
                zahl1.setText("Die Zahl 1 wurde"+c[0]+"mal gewürfelt");
                zahl2.setText("Die Zahl 2 wurde"+c[1]+"mal gewürfelt");
                zahl3.setText("Die Zahl 3 wurde"+c[2]+"mal gewürfelt");
                zahl4.setText("Die Zahl 4 wurde"+c[3]+"mal gewürfelt");
                zahl5.setText("Die Zahl 5 wurde"+c[4]+"mal gewürfelt");
                zahl6.setText("Die Zahl 6 wurde"+c[5]+"mal gewürfelt");
            }   
    }
    Last edited by iTTerror; May 12th, 2012 at 01:18 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Applet: Calculated variable can't be displayed

    Where are you expecting to see anything?
    Add some printlns to the code to show where the execution flow goes and what the values of variables are as they are used and set.

    Please Edit your post and wrap your code with[code=java]<YOUR CODE HERE>[/code] to get highlighting
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    iTTerror (May 12th, 2012)

  4. #3
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    Default Re: Applet: Calculated variable can't be displayed

    There is nothing immediately noticablely wrong. I mean, as long as that button is pressed, I don't see why the setText() lines wouldn't run. The only thing I'm not sure of is whether or not JLabels revalidate themselves. If not, that would be your problem. Someone else might know for sure how JLabels react to getting their text changed.
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  5. #4
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    Default Re: Applet: Calculated variable can't be displayed

    Quote Originally Posted by aussiemcgr View Post
    There is nothing immediately noticablely wrong. I mean, as long as that button is pressed, I don't see why the setText() lines wouldn't run. The only thing I'm not sure of is whether or not JLabels revalidate themselves. If not, that would be your problem. Someone else might know for sure how JLabels react to getting their text changed.
    The button appears, but when i click it, nothing happens. :/
    Quote Originally Posted by Norm View Post
    Where are you expecting to see anything?
    I was expecting to show the calculated dice value in the Label ausgabe.
    In the labels zahl1 through 6, should display how many times each number has been "rolled".
    Quote Originally Posted by Norm View Post
    Add some printlns to the code to show where the execution flow goes and what the values of variables are as they are used and set.
    I haven't used this in java it self yet, just in java script. I will try that out, thank you!

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