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cannot resolve symbol errors

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rbr19

rbr19

Programmer
Jun 2, 2004
4
GB
hi all,

i'm getting 2 cannot resolve symbol errors after i compiled my code. the full description of the errors are as below:

1. cannot resolve symbol
symbol: method addData (MyData)
location: class javax.swing.JPanel
centerPanel.addData(new MyData(""));
^
2. cannot resolve symbol
symbol : method addData (MyData)
location: class javax.swing.JPanel
centerPanel.addData(new MyData
(materialx.getSelectedItem().toString()));
^

i have a shorter version of this code & it worked. after i made some modifications like adding another jbutton & jcombobox then i started getting these errors. i must have made a few errors but unfortunately i just cannot figure out where i went wrong.

i would really appreciate if any of you guys can help me on this. thanks in advance.

below is my code:

Code: 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Graphics2D;
import java.awt.Graphics.*;
import java.util.ArrayList;

public class Testing extends JFrame implements ActionListener
{
    
String  x[] = { " ", "Material A", "Material B", "Material C"};
String  y[] = { "                       ", "+5", "+4", "+3", "+2", "+1", " 0", "-1", "-2", "-3", "-2", "-5" };
    
    private JButton Plot, End;
    private Container c;
    private JPanel centerPanel, northPanel, southPanel;
    private JComboBox materialx, materialRatingy;  
    MyGraph mg = new MyGraph();
       
   public Testing()
   {
      super( "Welcome" );
     
	  Container c = getContentPane(); 
	  centerPanel.addData(new MyData(""));
	  centerPanel = new JPanel();
	  centerPanel.setBackground(Color.white);
      	  c.add( centerPanel, BorderLayout.CENTER);
      	  setVisible(true);

northPanel = new JPanel();
northPanel.add(new Label( "Please choose accordingly:" ));
northPanel.setLayout (new FlowLayout(FlowLayout.CENTER, 20, 0));
          
    materialx = new JComboBox( x );
    materialx.setMaximumRowCount( 2 );
    materialx.setBorder  
   (BorderFactory.createTitledBorder("Design Materials"));
    northPanel.add( materialx );
    materialx.setEditable(true);
         
 materialRatingy = new JComboBox( y );
 materialRatingy.setMaximumRowCount( 2 );
 materialRatingy.setBorder(BorderFactory.createTitledBorder("Material Ratings"));
 northPanel.add( materialRatingy );
                 
         c.add( northPanel, BorderLayout.NORTH );
         setVisible( true );
         
         southPanel = new JPanel();
         Plot = new JButton( "Plot" );
         End = new JButton( "End" );
         
         southPanel.add( Plot );
         southPanel.add( End );
        
         c.add( southPanel, BorderLayout.SOUTH );
         setVisible( true );
         
         Plot.addActionListener(this);
         End.addActionListener(this);
         
         Plot.addActionListener(new ActionListener() 
   		{
        public void actionPerformed(ActionEvent e) 
        {
        
centerPanel.addData(new MyData(materialx.getSelectedItem().toString()));
centerPanel.repaint();
        }
        });
                                  
        pack();
       }
   
 public static void main( String args[] )
   {
      Testing app = new Testing();
      app.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

   }
   
   public void actionPerformed(ActionEvent e)
   {
   	if(e.getSource()==Plot)
 
   	{
   		System.out.println("Plot");
   	}

   else if(e.getSource()==End)
   	{
   		System.exit(0);
   	}
   }
   
} 
class MyGraph extends JPanel 
{
  ArrayList al = new ArrayList();
  public void addData(MyData data) 
  { al.add(data); }
  public void paintComponent(Graphics g) 
  {
    Graphics2D g2d = (Graphics2D)g;
    super.paintComponent(g);
       
        for (int i=0; i<al.size(); i++) 
        {
        MyData md = (MyData)al.get(i);
        g.setColor(Color.blue);
        g.drawRect(120+i*20, 120, 20, 200);
        g.drawString ("Material", 30, 220);
        g.drawString ("Ratings", 30, 240);
        g.drawString ("+5", 102, 130);
        g.drawString ("0", 107, 220);
        g.drawString ("-5", 102, 315);
        
        g.setColor(Color.red);
	g.drawRect(120+i*20, 321, 20, 200);
	g.drawString ("Design", 30, 410);
	g.drawString ("Materials", 30, 430);
        }
        
        g2d.rotate(-Math.PI/2.0,250,250);
        g.setColor(Color.blue);
        
        for (int i=0; i<al.size(); i++) 
        {
        MyData md = (MyData)al.get(i);
        g2d.drawString(md.getMaterial(),-15,15+i*20);
        }
  }
}
class MyData {
  String material;
  
  public MyData(String material) {
    this.material=material;
    
  }
  public String getMaterial() { return material; }
  
}
 
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Well there is no such method as "addData()" for a JPanel object (in this line) :

centerPanel.addData(new MyData(""));

--------------------------------------------------
Free Database Connection Pooling Software
 
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The problem is the function call "addData()"

---> centerPanel.addData()

There is no "addData" method defined? centerPanel is a JPanel which doesn't have a signature addData(MyData ).

if you take out the two statement that calls addData, the code will compile. What are you try to achieve with "addData"?
 
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byam :
I reckon we were posting at the same time there fella !

If you're in Europe, its bed time, and if you're in the US, its too early on a Sunday to be tek-tipping !! :)

( UK, GMT 01.43.00 )

--------------------------------------------------
Free Database Connection Pooling Software
 
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million thanks for the replies sedj & byam. i really appreciate it. i've managed to solve the problem. i've made some changes like:

1. i changed //centerPanel.addData(new MyData("")); to
mg.addData(new MyData(""));

2. i added mg.setBackground(Color.white); &
c.add( mg, BorderLayout.CENTER);

3. i changed //centerPanel.addData(new MyData(
materialx.getSelectedItem().toString())); to
mg.addData(new MyData(materialx.getSelectedItem().toString()));

4. i changed //centerPanel.repaint(); to
mg.repaint();

below is the code after i made the changes.

Code: 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Graphics2D;
import java.awt.Graphics.*;
import java.util.ArrayList;

public class Testing extends JFrame implements ActionListener
{
    
String  x[] = { " ", "Material A", "Material B", "Material C"};
String  y[] = { "                       ", "+5", "+4", "+3", "+2", "+1", " 0", 
    						"-1", "-2", "-3", "-2", "-5" };
    
    private JButton Plot, End;
    private Container c;
    private JPanel centerPanel, northPanel, southPanel;
    private JComboBox materialx, materialRatingy;  
    MyGraph mg = new MyGraph();
       
   public Testing()
   {
      super( "Welcome" );
     
	  Container c = getContentPane();
	  //centerPanel.addData(new MyData(""));
      mg.addData(new MyData(""));
	  centerPanel = new JPanel();
	  
	  
	   	
	  	 centerPanel.setBackground(Color.white);
      	 c.add( centerPanel, BorderLayout.CENTER);
      	 mg.setBackground(Color.white);
      	 c.add( mg, BorderLayout.CENTER);
      	 setVisible(true);
	 
	  	 northPanel = new JPanel();
   		 northPanel.add(new Label( "Please choose accordingly:" ));
   	     northPanel.setLayout (new FlowLayout(FlowLayout.CENTER, 20, 0));
          
         materialx = new JComboBox( x );
         materialx.setMaximumRowCount( 2 );
         materialx.setBorder(BorderFactory.createTitledBorder("Design Materials"));
         northPanel.add( materialx );
         materialx.setEditable(true);
         
         materialRatingy = new JComboBox( y );
         materialRatingy.setMaximumRowCount( 2 );
         materialRatingy.setBorder(BorderFactory.createTitledBorder("Material Ratings"));
         northPanel.add( materialRatingy );
                 
         c.add( northPanel, BorderLayout.NORTH );
         setVisible( true );
         
         southPanel = new JPanel();
         Plot = new JButton( "Plot" );
         End = new JButton( "End" );
         
         southPanel.add( Plot );
         southPanel.add( End );
        
         c.add( southPanel, BorderLayout.SOUTH );
         setVisible( true );
         
         Plot.addActionListener(this);
         End.addActionListener(this);
         
         
         
        Plot.addActionListener(new ActionListener() 
   		{
        public void actionPerformed(ActionEvent e) 
        {
        
        //centerPanel.addData(new MyData(materialx.getSelectedItem().toString()));
        //centerPanel.repaint();
        mg.addData(new MyData(materialx.getSelectedItem().toString()));
        mg.repaint();
        }
        });
                                  
        pack();
                                
 }
   
 
   public static void main( String args[] )
   {
      Testing app = new Testing();
      app.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

   }
   
   public void actionPerformed(ActionEvent e)
   {
   	
   	if(e.getSource()==Plot)
 
   	{
   		System.out.println("Plot");
   	}

   else if(e.getSource()==End)
   	{
   		System.exit(0);
   	}
   }
   
} 
class MyGraph extends JPanel 
{
  ArrayList al = new ArrayList();
  public void addData(MyData data) 
  { al.add(data); }
  public void paintComponent(Graphics g) 
  {
    Graphics2D g2d = (Graphics2D)g;
    super.paintComponent(g);
       
        g.setColor(Color.blue);
        g.drawString ("Material", 30, 220);
        g.drawString ("Ratings", 30, 240);
        g.drawString ("+5", 102, 130);
        g.drawString ("0", 107, 220);
        g.drawString ("-5", 102, 315);
        
        g.setColor(Color.red);
        g.drawString ("Design", 30, 410);
		g.drawString ("Materials", 30, 430);
        
            
        for (int i=0; i<al.size(); i++) 
        {
        MyData md = (MyData)al.get(i);
        g.setColor(Color.blue);
        g.drawRect(120+i*20, 120, 20, 200);
        
        
        g.setColor(Color.red);
		g.drawRect(120+i*20, 321, 20, 200);
		
        }
        
        g2d.rotate(-Math.PI/2.0,250,250);
        g.setColor(Color.blue);
        
        for (int i=0; i<al.size(); i++) 
        {
        MyData md = (MyData)al.get(i);
        g2d.drawString(md.getMaterial(), -15, 135+i*20);
        }
  }
}
class MyData {
  String material;
  
  public MyData(String material) {
    this.material=material;
    
  }
  public String getMaterial() { return material; }
  
}

ps: you are right sedj...it is bed time in the uk (uk gmt 02.25.00) i should be in bed some 2-3 hrs ago! thanks for reminding :) anyway cheers mate!
 
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