Java GUI: Using AbstractTableModel

When using the AbstractTableModel you need to store the table data as a Vector of Vectors. This is my helper function to insert new data.

Here is the example:

import java.awt.Dimension;
import java.awt.GridLayout;
import java.util.Vector;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
public class AbstractTableDemo extends JPanel {

 public AbstractTableDemo() {
  super(new GridLayout(1, 0));

  final JTable table = new JTable(new MyTableModel());
  table.setPreferredScrollableViewportSize(new Dimension(500, 70));
  table.setFillsViewportHeight(true);

  Object[] values = {
   "String",
   10,
   20.0,
   30.2,
   new Boolean(false)
  };
  MyTableModel a = (MyTableModel) table.getModel();
  a.insertData(values);

  //Create the scroll pane and add the table to it.
  JScrollPane scrollPane = new JScrollPane(table);

  //Add the scroll pane to this panel.
  add(scrollPane);
 }

 class MyTableModel extends AbstractTableModel {
  private String[] columnNames = {
   "Title A",
   "Title B",
   "Title C",
   "Title D",
   "Title E"
  };

  private Vector data = new Vector();

  public final Object[] longValues = {
   "",
   new Integer(20),
   new Float(20),
   new Float(20),
   Boolean.TRUE
  };

  @Override
  public int getColumnCount() {
   return columnNames.length;
   private String[] columnNames = {
    "Title A",
    "Title B",
    "Title C",
    "Title D",
    "Title E"
   };

   private Vector data = new Vector();

   public final Object[] longValues = {
    "",
    new Integer(20),
    new Float(20),
    new Float(20),
    Boolean.TRUE
   };

   @Override
   public int getColumnCount() {
    return columnNames.length;
   }

   @Override
   public int getRowCount() {
    return data.size();
   }

   @Override
   public Object getValueAt(int row, int col) {
    return ((Vector) data.get(row)).get(col);
   }

   public String getColumnName(int col) {
    return columnNames[col];
   }
   public Class getColumnClass(int c) {
    return getValueAt(0, c).getClass();
   }

   public void setValueAt(Object value, int row, int col) {
    ((Vector) data.get(row)).setElementAt(value, col);
    fireTableCellUpdated(row, col);
   }

   public boolean isCellEditable(int row, int col) {
    if (4 == col) {
     return true;
    } else {
     return false;
    }
   }

   public void insertData(Object[] values) {
    data.add(new Vector());
    for (int i = 0; i & lt; values.length; i++) {
     ((Vector) data.get(data.size() - 1)).add(values[i]);
    }
    fireTableDataChanged();
   }

   public void removeRow(int row) {
    data.removeElementAt(row);
    fireTableDataChanged();
   }
  }

  private static void createAndShowGUI() {
   JFrame frame = new JFrame("Abstract Table Demo");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

   AbstractTableDemo newContentPane = new AbstractTableDemo();
   frame.setContentPane(newContentPane);

   //Display the window.
   frame.pack();
   frame.setVisible(true);
  }

  public static void main(String[] args) {
   javax.swing.SwingUtilities.invokeLater(new Runnable() {
    public void run() {
     createAndShowGUI();
    }
   });
  }
 }