Help needed about DefaultTableModel code

Question

Hi,
Can anybody tell me what is wrong about the construction of my JTable. I create the instance of the below class and add to my JTable:
MyTableModel myModel = new MyTableModel();
JTable costTable = new JTable(myModel);
I can see printouts "MTM_1,2,3,4" then it gives me an exception
Exception caught in Scenegraph: 16 >= 16
The vector IFC_Tree.totalVector has members like:
IFC_Tree.totalVector[0]: [IFCBeam, 4.962499618530273, m3, 0.0, 0.0]
IFC_Tree.totalVector[1]: [IFCColumn, 13.84760570526123, m3, 0.0, 0.0]
IFC_Tree.totalVector[2]: [IFCFloor, 113.82814025878906, m3, 0.0, 0.0]
IFC_Tree.totalVector[3]: [IFCWall, 229.7195587158203, m3, 0.0, 0.0]
IFC_Tree.totalVector[4]: [IFCRoofSlab, 215.8400421142578, m2, 0.0, 0.0]
IFC_Tree.totalVector[5]: [IFCWindow_2.375*2.45, 8.0, number, 0.0, 0.0]
IFC_Tree.totalVector[6]: [IFCWindow_0.6*0.6, 20.0, number, 0.0, 0.0]
IFC_Tree.totalVector[7]: [IFCWindow_3.85*2.45, 3.0, number, 0.0, 0.0]
IFC_Tree.totalVector[8]: [IFCWindow_2.0*2.1, 2.0, number, 0.0, 0.0]
IFC_Tree.totalVector[9]: [IFCDoor_0.9*2.1, 17.0, number, 0.0, 0.0]
IFC_Tree.totalVector[10]: [IFCDoor_1.8*2.45, 2.0, number, 0.0, 0.0]
IFC_Tree.totalVector[11]: [IFCDoor_0.8*2.1, 28.0, number, 0.0, 0.0]
IFC_Tree.totalVector[12]: [IFCDoor_0.9*2.45, 11.0, number, 0.0, 0.0]
IFC_Tree.totalVector[13]: [IFCDoor_2.0*2.1, 2.0, number, 0.0, 0.0]
IFC_Tree.totalVector[14]: [IFCDoor_1.0*2.1, 4.0, number, 0.0, 0.0]
IFC_Tree.totalVector[15]: [null, null, null, TOTAL COST, 0.0]
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import javax.swing.DefaultCellEditor;
import java.util.Vector;
//public class MyTableModel extends AbstractTableModel
public class MyTableModel extends DefaultTableModel
private boolean DEBUG = true;
static double totalCost = 0.0;
static Vector data = new Vector();
static Vector columnNames = new Vector();
static Vector tmp;
public MyTableModel()
System.out.println("MTM_1");
addColumn("IFCOBJECTS OR PROCESSES");
addColumn("QUANTITY");
addColumn("UNITS");
addColumn("UNIT COST (�)");
addColumn("TOTAL COST (�)");
System.out.println("MTM_2");
for(int i=0; i < IFC_Tree.totalVector.size(); i++)
System.out.println("MTM_3");
tmp = (Vector)(IFC_Tree.totalVector.elementAt(i));
System.out.println("MTM_4");
addRow(tmp);
System.out.println("MTM_5");
System.out.println("MTM_6");
public int getColumnCount()
return columnNames.size();
public int getRowCount()
public String getColumnName(int col)
public Object getValueAt(int row, int col)
public boolean isCellEditable(int row, int col)
public void setValueAt(Object value, int row, int col)
}

Answer 1

I don't understand why you override the methods getRowCount() ... and why there are the static member variables columnNames .... (all this is done by the DefaultTableModel). Your table model initialization in the constructor should suffice.
Pierre