Problem in Row and column.

Question

Hi all,
This is the output for this snippet.
one Two ---> Column header
A     B -->Row datas.
C     D
E F
I am missing "G" in the above table.
What should i to get the output like this?
one Two ---> Column header
A     B -->Row datas.
C     D
E F
G
File: DataFileTable .java
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.util.*;
public class DataFileTable extends JPanel {
public DataFileTable() {
JTable table;
DataFileTableModel model;
Font f;
f = new Font("SanSerif",Font.PLAIN,24);
setFont(f);
setLayout(new BorderLayout());
model = new DataFileTableModel();
table = new JTable();
table.setModel(model);
table.createDefaultColumnsFromModel();
JScrollPane scrollpane = new JScrollPane(table);
add(scrollpane);
public Dimension getPreferredSize(){
return new Dimension(400, 300);
public static void main(String s[]) {
JFrame frame = new JFrame("Data File Table");
DataFileTable panel;
panel = new DataFileTable();
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.setForeground(Color.black);
frame.setBackground(Color.lightGray);
frame.getContentPane().add(panel,"Center");
frame.setSize(panel.getPreferredSize());
frame.setVisible(true);
frame.addWindowListener(new WindowCloser());
class WindowCloser extends WindowAdapter {
public void windowClosing(WindowEvent e) {
Window win = e.getWindow();
win.setVisible(false);
System.exit(0);
File:DataFileTableModel.java
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
import java.io.*;
import java.util.*;
public class DataFileTableModel extends AbstractTableModel {
protected Vector data;
protected Vector columnNames ;
public DataFileTableModel(){
initVectors();
public void initVectors() {
String aLine ;
data = new Vector();
columnNames = new Vector();
columnNames.addElement("one");
columnNames.addElement("two");
data.addElement("A");
data.addElement("B");
data.addElement("C");
data.addElement("D");
data.addElement("E");
data.addElement("F");
data.addElement("G");
public int getRowCount() {
return data.size() / getColumnCount();
public int getColumnCount(){
return columnNames.size();
public String getColumnName(int columnIndex) {
String colName = "";
if (columnIndex <= getColumnCount())
colName = (String)columnNames.elementAt(columnIndex);
return colName;
public Class getColumnClass(int columnIndex){
return String.class;
public boolean isCellEditable(int rowIndex, int columnIndex) {
return false;
public Object getValueAt(int rowIndex, int columnIndex) {
return (String)data.elementAt( (rowIndex * getColumnCount()) + columnIndex);
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
return;
}

Answer 1

Here I would guess your problem is with
public Object getValueAt(int rowIndex, int columnIndex) {
    return (String)data.elementAt( (rowIndex * getColumnCount()) + columnIndex);
}Even though you only have seven items in your data Vector, the table will
still try to populate all the cells in the number of rows you have. So, you
need to check if the index is greater than the Vector size and return an
empty string in that case. Something like
public Object getValueAt(int rowIndex, int columnIndex) {
    int index = rowIndex * getColumnCount() + columnIndex;
    return index < data.size() ?  data.elementAt( index ) : "";
}