dynamically update a JTextField with the sum of values in a JTable

Hello....
This has also been posted at:
http://www.coderanch.com/t/512189/GU...up-dynamically
and
http://forums.oracle.com/forums/thre...59375&tstart=0

I have a single column JTable - where the user may enter integer values. The sum of these values needs to get dynamically updated in a JTextField in a JPanel. How do I do this. Below is my code.

Thanks.....

Code:

import javax.swing.*; import javax.swing.table.*; import javax.swing.event.*; import javax.swing.table.DefaultTableCellRenderer; import java.awt.*; import java.util.*; import java.awt.color.*; import java.awt.event.*; public class TableandPanel extends JFrame { public static void main(String[] args) { JFrame frame = new JFrame("Table and Panel"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(100, 300); frame.setVisible(true); String colHdrA = "Some Values"; TableofSums tableofSums = new TableofSums(10, colHdrA); int sumValue = tableofSums.getSumValues(); String sumValueS = String.valueOf(sumValue); SumValuesPanel newPanel = new SumValuesPanel( "Score", sumValueS, "Rank"); JPanel thePanel = new JPanel(); thePanel.add(new JScrollPane(tableofSums)); thePanel.add(newPanel); frame.add(thePanel); frame.pack(); frame.setVisible(true); } } //--------------------------------JTable class starts here--------------------------- public class TableofSums extends JPanel implements TableModelListener { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { JFrame frame = new JFrame("Table"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(208, 230); //frame.add(new JScrollPane(table)); frame.setVisible(true); String colHdrA = "Some Values"; TableofSums tableofSums = new TableofSums(10, colHdrA); frame.setContentPane(tableofSums); //frame.add(new JScrollPane(timerepTable)); frame.pack(); frame.setVisible(true); } }); } private int noOfRows = 0; private JTable table; private String colName = null; private int sumValues = 0; public TableofSums(int noOfRows, String colName) { this.noOfRows = noOfRows; this.colName = colName; makeTable(); } private void makeTable() { Object columns[] = new Object[] {"<html><center>" + this.colName + "</center></html>"}; Object[][] data = new Object[noOfRows][1]; for (int i = 0; i<noOfRows; i++) { data[i][0] = new Integer(0); } DefaultTableModel model = new DefaultTableModel(data, columns); model.addTableModelListener(this); table = new JTable(model) { @Override public boolean isCellEditable(int row, int column) { switch (column) { case 0: return true; } return false; } @Override public Class<?> getColumnClass(int columnIndex) { switch (columnIndex) { case 0: return Integer.class; } return null; } }; table.setRowHeight(25); table.setDefaultRenderer(Integer.class, new SomeCellRenderer()); this.add(new JScrollPane(table)); } //-------------------------tablemodellistener---------------------------------// public void tableChanged(TableModelEvent e) { System.out.println(e.getSource()); if(e.getType() == TableModelEvent.UPDATE) { int row = e.getFirstRow(); int column = e.getColumn(); TableModel model = table.getModel(); sumValues = 0; for (int i=0; i<noOfRows; i++) { int intValue = (Integer)model.getValueAt(i, column); sumValues += intValue; } System.out.println ("row modified: " + row + " sumValues: " + sumValues); } } //---------------------------tablecellrenderer----------------------------------------------- public class SomeCellRenderer extends JLabel implements TableCellRenderer { public SomeCellRenderer() { setOpaque(true); } public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { String cellValue = String.valueOf(value); this.setText(cellValue); this.setBackground(Color.LIGHT_GRAY); this.setHorizontalAlignment(SwingConstants.CENTER); return this; } } public int getSumValues() { return sumValues; } } //-------------------------Panel Class Starts here------------------------------------- public class SumValuesPanel extends JPanel { /** * @param args */ public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); JFrame frame = new JFrame("SumValuesPanel"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); SumValuesPanel newContentPane = new SumValuesPanel( "Score", "XX.XX", "Rank"); frame.setContentPane(newContentPane); frame.pack(); frame.setVisible(true); } //------Variables declaration private JPanel thePanel; private JLabel scorejLabel; private JTextField ScorejTextField; private String scoreLabel; private String scoreValue; private JLabel rankLabel; private String rankLabelTxt; private JTextField rankTextField; private String rankText; //-------End of variables declaration public SumValuesPanel (String setScoreLabel,String setScoreVal, String rankLabel) { scoreLabel = setScoreLabel; scoreValue = setScoreVal; this.rankLabelTxt = rankLabel; createSumValuesPanel(); } private void createSumValuesPanel() { thePanel = new JPanel(); rankLabel = new JLabel(); rankTextField = new JTextField(); scorejLabel = new JLabel(); ScorejTextField = new JTextField(); thePanel.setBackground(new Color(235, 233, 230)); thePanel.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0))); thePanel.setPreferredSize(new Dimension(200, 180)); scorejLabel.setHorizontalAlignment(SwingConstants.CENTER); scorejLabel.setText(scoreLabel); scorejLabel.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0))); scorejLabel.setPreferredSize(new Dimension(40, 20)); ScorejTextField.setEditable(false); ScorejTextField.setHorizontalAlignment(JTextField.CENTER); ScorejTextField.setText(scoreValue); ScorejTextField.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0))); ScorejTextField.setMaximumSize(new Dimension(60, 25)); ScorejTextField.setMinimumSize(new Dimension(35, 15)); ScorejTextField.setPreferredSize(new Dimension(55, 20)); rankLabel.setHorizontalAlignment(SwingConstants.CENTER); rankLabel.setText(rankLabelTxt); rankLabel.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0))); rankLabel.setPreferredSize(new Dimension(90, 20)); rankTextField.setEditable(false); rankTextField.setBackground(new Color(255,255,0)); rankTextField.setHorizontalAlignment(JTextField.CENTER); rankTextField.setText(rankText); rankTextField.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0))); rankTextField.setPreferredSize(new Dimension(55, 20)); thePanel.add(scorejLabel); thePanel.add(ScorejTextField); thePanel.add(rankLabel); thePanel.add(rankTextField); this.add(thePanel); } }