Solved

Error in Main

Posted on 2004-04-23
8
238 Views
Last Modified: 2011-09-20
Hello everyone out there I hope someone can help me with this simple question!

Something is wrong with the main. Error cannot resolve symbol- constructor EightPointBlocks()

Get error can't recondnize



import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class EightPointBlocks extends JPanel implements ActionListener
{
     JCheckBox onOffButton;
     JLabel label;
     JPanel gridPanel;
     ArrayList EightPointBlocksArrayList;
     ArrayList arrayList;

public EightPointBlocks(int ncols, int nrows)

     {
          EightPointBlocksArrayList = new ArrayList();
          label = new JLabel();
          //Call it like this . . .
          gridPanel = new JPanel();
          gridPanel.setLayout(new GridLayout(0, ncols));
          // Setting MY layout...
          setLayout(new BorderLayout());
          add(label, BorderLayout.NORTH);
          add(gridPanel, BorderLayout.CENTER);
          label.setText("          8 Point Blocks");
          label.setForeground(Color.red);
          setBackground(Color.white);
          looprow : for (int row = 0; row < nrows; row++)
          {
               for (int col = 0; col < ncols; col++)
               {
                    int n = (20 * col + row + 1);
                    if (n > 50)
                    {
                         break looprow;
                    }
                    JButton onOffButton = new JColoredButton("" + n, Color.green, Color.black);
                    onOffButton.addActionListener(this);
                    //EightPointBlocksArrayList.add(onOffButton);
                    gridPanel.add(onOffButton);
               }
          }
     }


     public static void main(String[] args)
     {
          JFrame frame = new JFrame();
          frame.getContentPane().add(new EightPointBlocks());
          frame.setSize(400, 400);
          frame.setVisible(true);

          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     }

     public void actionPerformed(ActionEvent e)
{
                               
          JColoredButton button = (JColoredButton)e.getSource();
         
          int index = EightPointBlocksArrayList.indexOf(button) ;

          if (index > -1)
          {
               EightPointBlocksArrayList.remove(index); // removal of button
               EightPointBlocksArrayList.remove(index); // removal of timing.wav

               button.setDefaultColor();
          }
          else
          {
               EightPointBlocksArrayList.add(button);
               EightPointBlocksArrayList.add("timing.wav");
 
               button.setPressedColor();
          }
         
          System.out.println(EightPointBlocksArrayList);
}  

}

class JColoredButton extends JButton
{
     private Color foreground;
     private Color deafultForeground;
     private Color background;
     private Color defaultBackground;

     public JColoredButton(String label, Color background, Color foreground)
     {
          super(label);
          this.background = background;
          this.foreground = foreground;
          defaultBackground = getBackground();
          deafultForeground = getForeground();
     }
     
     public void setPressedColor()
     {
          setBackground(background);
          setForeground(foreground);
     }
     
     public void setDefaultColor()
     {
          setBackground(defaultBackground);
          setForeground(deafultForeground);
     }
}          
0
Comment
Question by:Drop_of_Rain
  • 5
  • 2
8 Comments
 
LVL 15

Expert Comment

by:Javatm
ID: 10906262
This should solve the problem :

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class EightPointBlocks extends JPanel implements ActionListener
{
     JCheckBox onOffButton;
     JLabel label;
     JPanel gridPanel;
     ArrayList EightPointBlocksArrayList;
     ArrayList arrayList;
     int ncols, nrows;

public EightPointBlocks()

     {
          EightPointBlocksArrayList = new ArrayList();
          label = new JLabel();
          //Call it like this . . .
          gridPanel = new JPanel();
          gridPanel.setLayout(new GridLayout(0, ncols));
          // Setting MY layout...
          setLayout(new BorderLayout());
          add(label, BorderLayout.NORTH);
          add(gridPanel, BorderLayout.CENTER);
          label.setText("          8 Point Blocks");
          label.setForeground(Color.red);
          setBackground(Color.white);
          looprow : for (int row = 0; row < nrows; row++)
          {
               for (int col = 0; col < ncols; col++)
               {
                    int n = (20 * col + row + 1);
                    if (n > 50)
                    {
                         break looprow;
                    }
                    JButton onOffButton = new JColoredButton("" + n, Color.green, Color.black);
                    onOffButton.addActionListener(this);
                    //EightPointBlocksArrayList.add(onOffButton);
                    gridPanel.add(onOffButton);
               }
          }
     }


     public static void main(String[] args)
     {
          JFrame frame = new JFrame();
          frame.getContentPane().add(new EightPointBlocks());
          frame.setSize(400, 400);
          frame.setVisible(true);

          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     }

     public void actionPerformed(ActionEvent e)
{

          JColoredButton button = (JColoredButton)e.getSource();

          int index = EightPointBlocksArrayList.indexOf(button) ;

          if (index > -1)
          {
               EightPointBlocksArrayList.remove(index); // removal of button
               EightPointBlocksArrayList.remove(index); // removal of timing.wav

               button.setDefaultColor();
          }
          else
          {
               EightPointBlocksArrayList.add(button);
               EightPointBlocksArrayList.add("timing.wav");

               button.setPressedColor();
          }

          System.out.println(EightPointBlocksArrayList);
}

}

class JColoredButton extends JButton
{
     private Color foreground;
     private Color deafultForeground;
     private Color background;
     private Color defaultBackground;

     public JColoredButton(String label, Color background, Color foreground)
     {
          super(label);
          this.background = background;
          this.foreground = foreground;
          defaultBackground = getBackground();
          deafultForeground = getForeground();
     }

     public void setPressedColor()
     {
          setBackground(background);
          setForeground(foreground);
     }

     public void setDefaultColor()
     {
          setBackground(defaultBackground);
          setForeground(deafultForeground);
     }
}

Hope that helps . . .
Javatm
0
 
LVL 15

Expert Comment

by:Javatm
ID: 10906284
Test it and if it gives you a runtime error
it is because the int ncols, nrows; doesnt not have any values yet.

So you need to specify the value like :

int ncols=2, nrows=2;

Hope that helps . . .
Javatm
0
 
LVL 14

Expert Comment

by:Tommy Braas
ID: 10906299
When creating the EightPointBlocks instance

          frame.getContentPane().add(new EightPointBlocks());

 should be (for instance):

          frame.getContentPane().add(new EightPointBlocks(2,4));
 
0
 
LVL 15

Expert Comment

by:Javatm
ID: 10906307
> When creating the EightPointBlocks instance
> frame.getContentPane().add(new EightPointBlocks());
> should be (for instance):
> frame.getContentPane().add(new EightPointBlocks(2,4));

Which is like my 1st and 2nd comment :)


import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class EightPointBlocks extends JPanel implements ActionListener
{
     JCheckBox onOffButton;
     JLabel label;
     JPanel gridPanel;
     ArrayList EightPointBlocksArrayList;
     ArrayList arrayList;
     int ncols=2, nrows=2;

public EightPointBlocks()

     {
          EightPointBlocksArrayList = new ArrayList();
          label = new JLabel();
          //Call it like this . . .
          gridPanel = new JPanel();
          gridPanel.setLayout(new GridLayout(0, ncols));
          // Setting MY layout...
          setLayout(new BorderLayout());
          add(label, BorderLayout.NORTH);
          add(gridPanel, BorderLayout.CENTER);
          label.setText("          8 Point Blocks");
          label.setForeground(Color.red);
          setBackground(Color.white);
          looprow : for (int row = 0; row < nrows; row++)
          {
               for (int col = 0; col < ncols; col++)
               {
                    int n = (20 * col + row + 1);
                    if (n > 50)
                    {
                         break looprow;
                    }
                    JButton onOffButton = new JColoredButton("" + n, Color.green, Color.black);
                    onOffButton.addActionListener(this);
                    //EightPointBlocksArrayList.add(onOffButton);
                    gridPanel.add(onOffButton);
               }
          }
     }


     public static void main(String[] args)
     {
          JFrame frame = new JFrame();
          frame.getContentPane().add(new EightPointBlocks());
          frame.setSize(400, 400);
          frame.setVisible(true);

          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     }

     public void actionPerformed(ActionEvent e)
{

          JColoredButton button = (JColoredButton)e.getSource();

          int index = EightPointBlocksArrayList.indexOf(button) ;

          if (index > -1)
          {
               EightPointBlocksArrayList.remove(index); // removal of button
               EightPointBlocksArrayList.remove(index); // removal of timing.wav

               button.setDefaultColor();
          }
          else
          {
               EightPointBlocksArrayList.add(button);
               EightPointBlocksArrayList.add("timing.wav");

               button.setPressedColor();
          }

          System.out.println(EightPointBlocksArrayList);
}

}

class JColoredButton extends JButton
{
     private Color foreground;
     private Color deafultForeground;
     private Color background;
     private Color defaultBackground;

     public JColoredButton(String label, Color background, Color foreground)
     {
          super(label);
          this.background = background;
          this.foreground = foreground;
          defaultBackground = getBackground();
          deafultForeground = getForeground();
     }

     public void setPressedColor()
     {
          setBackground(background);
          setForeground(foreground);
     }

     public void setDefaultColor()
     {
          setBackground(defaultBackground);
          setForeground(deafultForeground);
     }
}
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 15

Accepted Solution

by:
Javatm earned 125 total points
ID: 10906318
Or it can be :

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class EightPointBlocks extends JPanel implements ActionListener
{
     JCheckBox onOffButton;
     JLabel label;
     JPanel gridPanel;
     ArrayList EightPointBlocksArrayList;
     ArrayList arrayList;

public EightPointBlocks(int ncols, int nrows)

     {
          EightPointBlocksArrayList = new ArrayList();
          label = new JLabel();
          //Call it like this . . .
          gridPanel = new JPanel();
          gridPanel.setLayout(new GridLayout(0, ncols));
          // Setting MY layout...
          setLayout(new BorderLayout());
          add(label, BorderLayout.NORTH);
          add(gridPanel, BorderLayout.CENTER);
          label.setText("          8 Point Blocks");
          label.setForeground(Color.red);
          setBackground(Color.white);
          looprow : for (int row = 0; row < nrows; row++)
          {
               for (int col = 0; col < ncols; col++)
               {
                    int n = (20 * col + row + 1);
                    if (n > 50)
                    {
                         break looprow;
                    }
                    JButton onOffButton = new JColoredButton("" + n, Color.green, Color.black);
                    onOffButton.addActionListener(this);
                    //EightPointBlocksArrayList.add(onOffButton);
                    gridPanel.add(onOffButton);
               }
          }
     }


     public static void main(String[] args)
     {
          JFrame frame = new JFrame();
     
          // Instantiating the size . . .

          frame.getContentPane().add(new EightPointBlocks(2,2));
          frame.setSize(400, 400);
          frame.setVisible(true);

          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     }

     public void actionPerformed(ActionEvent e)
{
                               
          JColoredButton button = (JColoredButton)e.getSource();
         
          int index = EightPointBlocksArrayList.indexOf(button) ;

          if (index > -1)
          {
               EightPointBlocksArrayList.remove(index); // removal of button
               EightPointBlocksArrayList.remove(index); // removal of timing.wav

               button.setDefaultColor();
          }
          else
          {
               EightPointBlocksArrayList.add(button);
               EightPointBlocksArrayList.add("timing.wav");
 
               button.setPressedColor();
          }
         
          System.out.println(EightPointBlocksArrayList);
}  

}

class JColoredButton extends JButton
{
     private Color foreground;
     private Color deafultForeground;
     private Color background;
     private Color defaultBackground;

     public JColoredButton(String label, Color background, Color foreground)
     {
          super(label);
          this.background = background;
          this.foreground = foreground;
          defaultBackground = getBackground();
          deafultForeground = getForeground();
     }
     
     public void setPressedColor()
     {
          setBackground(background);
          setForeground(foreground);
     }
     
     public void setDefaultColor()
     {
          setBackground(defaultBackground);
          setForeground(deafultForeground);
     }
}          
0
 

Author Comment

by:Drop_of_Rain
ID: 10906389
Comment from Javatm
Date: 04/23/2004 10:32PM PDT
 Comment  


Or it can be :  This one fixed my last posted comment. I should of looked at the code better before i tried your last one.

Thanks,
Christopher
0
 

Author Comment

by:Drop_of_Rain
ID: 10906394
Javatm

I have never gotten an email from you. Why don't you get an email at Yahoo to then we will be able to email each other. email me when you do.
0
 
LVL 15

Expert Comment

by:Javatm
ID: 10906420
Yes of course my friend I'm very sorry I was busy but dont worry I'll send you e-mails.
I have an e-mail in yahoo but it contains a lot of spams and I dont know how to fix it.

You know friend I've always wanted to be a real Java Programmer but I have'nt
got any chance to prove it.

I applied for one but they are still reviewing it. How I wish I could be a real
programmer instead of being a tech support.

Thanks for your time . . .
Javatm
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…

867 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now