Rendering custom class in JTable

Question

Greetings
I am attempting to build an application that uses a JTable to display various attributes of seismic files. I want users to be able to display various attributes for each individual column so that they could display the actual value read from the file, the format used to read the value, the byte offset of the value or a string denoting all 3 attributes. I have created a class to hold the cell values
public class SegyCell
     public static final int SHORT_INT = 0;
       public static final int LONG_INT = 1;
       public static final int IBM_FLOAT = 2;
       public static final int IEEE_FLOAT = 3;
       public static final int SINGLE_BYTE = 4;
     public final int SHOW_VALUE=0;
     public final int SHOW_FORMAT=1;
     public final int SHOW_BYTEPOS=2;
     public final int SHOW_ALL=3;
     private Object BytePosition;
     private Object Format;     
     private Object Value;
     private Object Displayed;
     public SegyCell(Object value,int bytepos,int format)
          //     trace header value from SEGY. keep byte position, format as well as value
          Value=value;
          BytePosition=new Integer(bytepos);
          Format=new Integer(format);
          Displayed=Value;
     public SegyCell(Object value)
          //     string or other value where format and bytepos arent important
          Value=value;
          Displayed=Value;
          BytePosition=null;
          Format=null;
     public void SetDisplay(int show)
          if(show==SHOW_VALUE)
               Displayed=Value;
          else if(show==SHOW_FORMAT)
               Displayed=Format;
          else if(show==SHOW_BYTEPOS)
               Displayed=BytePosition;
          else
               Displayed=Value;
     public Object GetDisplayed()
          return Displayed;
     }I store objects of SegyCell in each JTable cell.
I have created a custom renderer
class MySegyCellRenderer  extends  DefaultTableCellRenderer          
     public void setValue(SegyCell cell)
          Object value=cell.GetDisplayed();
          if(value.getClass().getName().equals("java.lang.String"))
               setText(value.toString());
          else
               java.text.NumberFormat format = NumberFormat.getNumberInstance();
               setText(value== null ? "" : format.format(value));
}I set the renderer for each column
     private void setColumnRenderers()
          for(int i=0;i<ColumnNames.length;i++)
               TableColumn col=getColumn(ColumnNames);
               col.setCellRenderer(new MySegyCellRenderer());
I have tested my code and the SegyCell objects are being stored by the Table model. However when the table appears each cell is just filled with the address of the SegyCell object.
Also the setValue method in my renderer is never used.
Obviously I am doing something really dumb here but darned if I can see it. Any insights or whacks on the head would be most appreciated.
Regards
Doug Bath

Answer 1

Thanks Nicholas
You pointed me in the right direction. I had to make a slight change to my setValue method.
class MySegyCellRenderer  extends  DefaultTableCellRenderer          
     public void setValue(Object ob)
          SegyCell cell=(SegyCell)ob;
          Object value=cell.GetDisplayed();
             if(value.getClass().getName().equals("java.lang.String"))
               setText(value.toString());
          else
               java.text.NumberFormat format = NumberFormat.getNumberInstance();
               setText(value== null ? "" : format.format(value));
}And now my cells are rendering properly. I also used the setDefaultRenderer as suggested by camckr. My cells are appearing properly now.
You are right in that Format and Byte position are always integer. However I only create them once and I may assign them to Displayed multiple times so I thought it best to make them Objects up front.
Thanks again
Doug