Problems with a JTable

Hello folks,
i got two problems with a JTable.
1. how do I change the size of a table header???
2. I know that it is possible to set different column-sizes. The problem in my table is that I don't know how long some cells are. In this case, I want to to get the biggest cell of one column and set its size as the default size of that specific column.
Is that possilbe?
Hopefully you can help me out,
thank you

A JTableHeader is just another Component, so you ought to be able to set its size like you would
any other component; however, since its function is to act as a header for a table, it might constrain
itself to fit the table.
In order to size the column to fit the largest cell, for each row, go through each column and get the
renderer component for that column (which configures the component for rendering) and get the width
of that component. If that's bigger than the column's current width, set its width and preferred width.
You'll also want to check the renderer component width for the header to make sure the header doesn't
get truncated if the column doesn't have a cell whose value is longer than the header.
: jay

Similar Messages

Problem with a JTable Update

I have a JDialog with a JTable and JScrollPane.
JTable uses TableModel.java
Now, when I am tryint to scroll to the right, the name of the columns, that was out of window won't redraw and the text is merged. The rows are ok. Only the titles.
How to get the column names updated?
Here is the code:
TableTest.java (JDialog)
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JDialog;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class TableTest extends JDialog {
     private JPanel jContentPane = null;
     private JScrollPane jScrollPane = null;
     private JTable jTable = null;
     private TableModel tableModel = null;
      * This is the default constructor
     public TableTest() {
          super();
          initialize();
      * This method initializes this
      * @return void
     private void initialize() {
          this.setSize(300, 200);
          this.setContentPane(getJContentPane());
      * This method initializes jContentPane
      * @return javax.swing.JPanel
     private JPanel getJContentPane() {
          if (jContentPane == null) {
               jContentPane = new JPanel();
               jContentPane.setLayout(new BorderLayout());
               jContentPane.add(getJScrollPane(), java.awt.BorderLayout.NORTH);
          return jContentPane;
      * This method initializes jScrollPane
      * @return javax.swing.JScrollPane
     private JScrollPane getJScrollPane() {
          if (jScrollPane == null) {
               jScrollPane = new JScrollPane();
               jScrollPane.setPreferredSize(new java.awt.Dimension(453,100));
               jScrollPane.setViewportView(getJTable());
          return jScrollPane;
      * This method initializes jTable
      * @return javax.swing.JTable
     private JTable getJTable() {
          if (jTable == null) {
               jTable = new JTable();
               jTable.setAutoResizeMode(javax.swing.JTable.AUTO_RESIZE_OFF);
               jTable.setModel(getTableModel());
               jTable.setPreferredSize(new java.awt.Dimension(500,80));
          return jTable;
      * This method initializes tableModel
      * @return TableModel
     private TableModel getTableModel() {
          if (tableModel == null) {
               tableModel = new TableModel();
          return tableModel;
TableModel.javaimport javax.swing.table.AbstractTableModel;
public class TableModel extends AbstractTableModel {
     private String[] columnNames = {"First Name",
               "Last Name",
               "Sport",
               "# of Years",
     "Vegetarian"};
     private Object[][] data = {
               {"Mary", "Campione",
                    "Snowboarding", new Integer(5), new Boolean(false)},
                    {"Alison", "Huml",
                         "Rowing", new Integer(3), new Boolean(true)},
                         {"Kathy", "Walrath",
                              "Knitting", new Integer(2), new Boolean(false)},
                              {"Sharon", "Zakhour",
                                   "Speed reading", new Integer(20), new Boolean(true)},
                                   {"Philip", "Milne",
                                        "Pool", new Integer(10), new Boolean(false)}
     public final Object[] longValues = {"Sharon", "Campione",
               "None of the above",
               new Integer(20), Boolean.TRUE};
     public int getColumnCount() {
          return columnNames.length;
     public int getRowCount() {
          return data.length;
     public String getColumnName(int col) {
          return columnNames[col];
     public Object getValueAt(int row, int col) {
          return data[row][col];
     * JTable uses this method to determine the default renderer/
     * editor for each cell. If we didn't implement this method,
     * then the last column would contain text ("true"/"false"),
     * rather than a check box.
     public Class getColumnClass(int c) {
          return getValueAt(0, c).getClass();
     public void setValueAt(Object value, int row, int col) {
          data[row][col] = value;
          fireTableCellUpdated(row, col);

Heres your code (reworked a little to show what i mean)
does this solve your issue?
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JDialog;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
public class TableTest extends javax.swing.JFrame {
     private JPanel jContentPane = null;
     private JScrollPane jScrollPane = null;
     private JTable jTable = null;
     private TableModel tableModel = null;
      * This is the default constructor
     public TableTest() {
          super();
          initialize();
      * This method initializes this
      * @return void
     private void initialize() {
          this.setSize(300, 200);
          this.setContentPane(getJContentPane());
      * This method initializes jContentPane
      * @return javax.swing.JPanel
     private JPanel getJContentPane() {
          if (jContentPane == null) {
               jContentPane = new JPanel();
               jContentPane.setLayout(new BorderLayout());
               jContentPane.add(getJScrollPane(), java.awt.BorderLayout.NORTH);
          return jContentPane;
      * This method initializes jScrollPane
      * @return javax.swing.JScrollPane
     private JScrollPane getJScrollPane() {
          if (jScrollPane == null) {
               jScrollPane = new JScrollPane();
               jScrollPane.setPreferredSize(new java.awt.Dimension(453,100));
               jScrollPane.setViewportView(getJTable());
          return jScrollPane;
      * This method initializes jTable
      * @return javax.swing.JTable
     private JTable getJTable() {
          if (jTable == null) {
               jTable = new JTable();
               jTable.setAutoResizeMode(javax.swing.JTable.AUTO_RESIZE_OFF);
               jTable.setModel(getTableModel());
               //jTable.setPreferredSize(new java.awt.Dimension(500,80)); //this line is causing your error, but i dont know why
          return jTable;
      * This method initializes tableModel
      * @return TableModel
     private TableModel getTableModel() {
          if (tableModel == null) {
               tableModel = new TableModel();
          return tableModel;
        public static void main (String[] main)
            new TableTest().setVisible(true);
class TableModel extends AbstractTableModel {
     private String[] columnNames = {"First Name",
               "Last Name",
               "Sport",
               "# of Years",
     "Vegetarian"};
     private Object[][] data = {
               {"Mary", "Campione",
                    "Snowboarding", new Integer(5), new Boolean(false)},
                    {"Alison", "Huml",
                         "Rowing", new Integer(3), new Boolean(true)},
                         {"Kathy", "Walrath",
                              "Knitting", new Integer(2), new Boolean(false)},
                              {"Sharon", "Zakhour",
                                   "Speed reading", new Integer(20), new Boolean(true)},
                                   {"Philip", "Milne",
                                        "Pool", new Integer(10), new Boolean(false)}
     public final Object[] longValues = {"Sharon", "Campione",
               "None of the above",
               new Integer(20), Boolean.TRUE};
     public int getColumnCount() {
          return columnNames.length;
     public int getRowCount() {
          return data.length;
     public String getColumnName(int col) {
          return columnNames[col];
     public Object getValueAt(int row, int col) {
          return data[row][col];
      * JTable uses this method to determine the default renderer/
      * editor for each cell. If we didn't implement this method,
      * then the last column would contain text ("true"/"false"),
      * rather than a check box.
     public Class getColumnClass(int c) {
          return getValueAt(0, c).getClass();
     public void setValueAt(Object value, int row, int col) {
          data[row][col] = value;
          fireTableCellUpdated(row, col);
}

Problems with JList & JTable in Netbeans 5.5

Hi,
Netbeans provides good GUI building provider.
But when i am adding JList inside panel
and trying to add elements its giving error.
So how to modify read only code in netBeans 5.5 generated code. ??
There is problem accessing JList variable to be modify.
HOW TO ACHIEVE THIS ????
because When you add JList in your GUI Part.
Netbeans generates code automatically.
we can't change it.
HOW TO DO it... ???

I have had similar trouble.
In NetBeans Guieditor, JList and JTable are automatically created in a JScrollPanel. This is good as it saves you lots of formatting.
PROBLEM: when you click/select the JTable or JList in the GUI Editor the Properties box (right hand side ) only shows properties for the JScrollPane.
So you will only be able to edit Init code etc for the JScrollPane
SOLUTION: The "Members View" is a list of members (Panels, Objects, etc) on the left hand side of the screen.
The JScrollPane is listed there. You simply click on this to expand and select the JTable/JList that it contains.
When you select the JTable/JList the Properites window (right side of screen) now shows the properties for the component you really want to deal with.
The code options are very powerful.

Problem with refreshing jtable. help please urgent.

hi there
i can refresh the table now, but the problem is that every time it refreshes, it adds the same data to the freshed table. i just need the table to display what was displayed few seconds ago unless there is change in the datasource. here is my code:
public void run()
String selectSQL = "select * from buyerordertable";
int rowCounter = 1;
boolean okay = true;
ResultSet rs;
Vector rowdata = new Vector();
Vector columNames = new Vector();
columNames.add("order Id");
columNames.add("suplier name");
columNames.add("item name");
columNames.add("model");
columNames.add("quantity");
columNames.add("price");
columNames.add("description");
columNames.add("job Id");
columNames.add("order confirm Id");
while (okay)
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:wgclientdatabase", "admin", "");
PreparedStatement ps = con.prepareStatement(selectSQL);
rs = null;
rs = ps.executeQuery();
while(rs.next())
Vector temp =new Vector();
String orderid = rs.getString("OrderID");
temp.add(orderid);
String supplier =rs.getString("supplierName");
temp.add(supplier);
String item = rs.getString("ItemName");
temp.add(item);
String model = rs.getString("Model");
temp.add(model);
String quantity = rs.getString("Quantity");
temp.add(quantity);
String price = rs.getString("Price");
temp.add(price);
String description = rs.getString("Description");
temp.add(description);
String jobid = rs.getString("JobID");
temp.add(jobid);
String confirmid = rs.getString("OrderConfirmID");
temp.add(confirmid);
rowdata.add(temp);
}catch (SQLException sqle)
catch(ClassNotFoundException ce)
try
/*the table keeps adding old data to the refreshed table. i start with one row of data, after every second, a new row of same data is added to the table. i don't know why.*/
DefaultTableModel newmodel =(DefaultTableModel)jTable.getModel();
newmodel.setDataVector(rowdata, columNames);
jScrollPane.repaint();
Thread.sleep(1000);
catch (InterruptedException e)
okay = false;
}

hi there
thank you for your reply
doesn't the tablemodel keep one set of data? every time i refresh the table, the table model should only provide same data over and over unless it is reset again? in my program, the result seems like the table model is cumulating data every time it refreshes. and the display is growing with the same data. i already use the
newmodel.setDataVector(rowdata, columNames);
to reset the data. ideally the table should only display rowdata. some people say that just using table model will solve the refreshing task. i am not sure if they have my kind of problem.

Problem with JTable and JPanel

Hi,
I'm having problems with a JTable in a JPanel. The code is basicly as follows:
public class mainFrame extends JFrame
        public mainFrame()
                //A menu is implemeted giving rise to the following actions:
                public void actionPerformed(ActionEvent evt)
                        String arg = evt.getActionCommand();
                        if(arg.equals("Sit1"))
                        //cells, columnNames are initiated correctly
                        JTable table = new JTable(cells,columnNames);
                        JPanel holdingPanel = new JPanel();
                        holdingPanel.setLayout( new BorderLayout() );
                        JScrollPane scrollPane = new JScrollPane(holdingPanel);
                        holdingPanel.setBackground(Color.white);
                        holdingPanel.add(table,BorderLayout.CENTER);
                        add(scrollPane, "Center");
                        if(arg.equals("Sit2"))
                                if(scrollPane !=null)
                                        remove(scrollPane);validate();System.out.println("ScrollPane");
                                if(holdingPanel !=null)
                                        remove(holdingPanel);
                                if(table !=null)
                                        remove(table);table.setVisible(false);System.out.println("table");
                        //Put other things on the holdingPanel....
        private JScrollPane scrollPane;
        private JPanel holdingPanel;
        private JTable table;
}The problem is that the table isn't removed. When you choose another situation ( say Sit2), at first the table apparently is gone, but when you press with the mouse in the area it appeared earlier, it appears again. How do I succesfully remove the table from the panel? Removing the panel doesn't seem to be enough. Help is much appreciated...
Best regards
Schwartz

If you reuse the panel and scroll pane throughout the application,
instantiate them in the constructor, not in an often-called event
handler. In the event handler, you only do add/remove of the table
on to the panel. You can't remove the table from the container
which does not directly contain it.
if (arg.equals("Sit2")){
holdingPanel.remove(table);
holdingPanel.revalidate();
holdingPanel.repaint(); //sometimes necessary
}

Problem printing the JTable

Hi all,
I have a problem with printing JTable.
My application has a submit button,JTable and Print Button.
As I click on the Submit button, the data is retrieved from the Database(MS Access) and displayed on the JTable.
Now when I click on the Print button, the printer properties dialog box is displayed. But when I click on the print button in the dialog box, nothing is printed on the paper.
I checked the printers and faxes in the control panel, It showed Java printing under the Document name and Printing under the Status. It is displayed for sometime and then disappeared after some time. But nothing is printed on the paper(not even the blank paper).
I tried a lot but couldn't understand the problem.
I have used the following files:
PrintJTable.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import java.awt.geom.*;
import java.awt.Dimension;
import java.applet.*;
import java.sql.*;
import java.util.*;
import java.net.*;
import java.lang.*;
import javax.swing.table.*;
import javax.swing.event.*;
import javax.swing.border.*;
class PrintJTable implements ActionListener,Printable
Connection connect;
ResultSet rs;
JTable table;
JScrollPane tableAggregate;
DisplayTable displayTable;
JButton print,submitButton;
public PrintJTable()
JFrame frame = new JFrame("Table");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}});
connect();
displayTable= new DisplayTable();
JButton submitButton= new JButton("SUBMIT");
submitButton.addActionListener(this);
JButton printButton= new JButton("PRINT!");
// for faster printing turn double buffering off
RepaintManager.currentManager( frame).setDoubleBufferingEnabled(false);
printButton.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent evt) {
PrinterJob pj=PrinterJob.getPrinterJob();
pj.setPrintable(PrintJTable.this);
pj.printDialog();
try{
pj.print();
}catch (Exception PrintException) {}
tableAggregate = createTable();
tableAggregate.setBorder(new BevelBorder(BevelBorder.LOWERED));
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add(submitButton,BorderLayout.NORTH);
frame.getContentPane().add(tableAggregate,BorderLayout.CENTER);
frame.getContentPane().add(printButton,BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
} // end of constructor
public void connect()
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("Opening db connection");
connect = DriverManager.getConnection("jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};DBQ=C:/db1.mdb","","");
catch (ClassNotFoundException ex) {
System.err.println("Cannot find the database driver classes.");
System.err.println(ex);
catch (SQLException ex) {
System.err.println("Cannot connect to this database.");
System.err.println(ex);
public JScrollPane createTable() {
displayTable= new DisplayTable();
JTable table = new JTable(displayTable);
 table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
 table.getTableHeader().setReorderingAllowed(false);
JScrollPane scrollpane = new JScrollPane(table,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
return scrollpane;
} // end of createTable()
public void actionPerformed(ActionEvent ie)
try
Statement statement6=connect.createStatement();
ResultSet rs6=statement6.executeQuery("select * from benf_details");
displayTable.executeQuery(rs6);
statement6.close();
catch(SQLException sqle)
JOptionPane.showMessageDialog(null,"error2"+sqle);
}// end of actionPerformed
public int print(Graphics g, PageFormat pageFormat, int pageIndex) throws PrinterException {
Graphics2D g2 = (Graphics2D)g;
g2.setColor(Color.black);
int fontHeight=g2.getFontMetrics().getHeight();
int fontDesent=g2.getFontMetrics().getDescent();
double pageHeight = pageFormat.getImageableHeight()-fontHeight; //leave room for page number
double pageWidth = pageFormat.getImageableWidth();
System.out.println("page width = " + pageWidth );
double tableWidth = (double) table.getColumnModel().getTotalColumnWidth();
System.out.println("table width = " + tableWidth );
double scale = 1;
if (tableWidth >= pageWidth) {
scale = pageWidth / tableWidth;
System.out.println("scale = " + scale );
double headerHeightOnPage = table.getTableHeader().getHeight() * scale;
double tableWidthOnPage = tableWidth * scale;
double oneRowHeight = (table.getRowHeight() + table.getRowMargin()) * scale;
int numRowsOnAPage = (int)((pageHeight - headerHeightOnPage) / oneRowHeight);
double pageHeightForTable = oneRowHeight * numRowsOnAPage;
int totalNumPages = (int)Math.ceil(((double)table.getRowCount())/numRowsOnAPage);
if(pageIndex >= totalNumPages) {
return NO_SUCH_PAGE;
g2.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
g2.drawString("Page: "+ (pageIndex + 1),(int)pageWidth / 2 - 35,
(int)( pageHeight + fontHeight - fontDesent ));//bottom center
g2.translate( 0f, headerHeightOnPage );
g2.translate( 0f, -pageIndex * pageHeightForTable );
//If this piece of the table is smaller than the size available,
//clip to the appropriate bounds.
if (pageIndex + 1 == totalNumPages) {
int lastRowPrinted = numRowsOnAPage * pageIndex;
int numRowsLeft = table.getRowCount() - lastRowPrinted;
g2.setClip(0, (int)(pageHeightForTable * pageIndex),
(int) Math.ceil(tableWidthOnPage),
(int) Math.ceil(oneRowHeight * numRowsLeft));
//else clip to the entire area available.
else{
g2.setClip(0, (int)(pageHeightForTable * pageIndex),
(int) Math.ceil(tableWidthOnPage),
(int) Math.ceil(pageHeightForTable));
g2.scale(scale,scale);
table.paint(g2);
g2.scale(1/scale,1/scale);
g2.translate( 0f, pageIndex * pageHeightForTable);
g2.translate( 0f, -headerHeightOnPage);
g2.setClip(0, 0,(int) Math.ceil(tableWidthOnPage), (int)Math.ceil(headerHeightOnPage));
g2.scale(scale,scale);
table.getTableHeader().paint(g2);//paint header at top
return Printable.PAGE_EXISTS;
} // end of print()
public static void main(String[] args) {
new PrintJTable();
}// end of PrintJTable
DisplayTable.java
import java.util.Vector;
import java.sql.*;
import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.TableModelEvent;
public class DisplayTable extends AbstractTableModel {
Connection connection;
Statement statement;
ResultSet resultSet;
String[] columnNames = {};
Vector rows = new Vector();
ResultSetMetaData metaData;
String db_uname,db_passwd;
public DisplayTable() {
public void executeQuery(ResultSet resultSet) {
try {
metaData = resultSet.getMetaData();
int numberOfColumns = metaData.getColumnCount();
columnNames = new String[numberOfColumns];
// Get the column names and cache them.
// Then we can close the connection.
for(int column = 0; column < numberOfColumns; column++) {
columnNames[column] = metaData.getColumnLabel(column+1);
// Get all rows.
rows = new Vector();
while (resultSet.next()) {
Vector newRow = new Vector();
for (int i = 1; i <= getColumnCount(); i++) {
 newRow.addElement(resultSet.getObject(i));
rows.addElement(newRow);
// close(); Need to copy the metaData, bug in jdbc:odbc driver.
fireTableChanged(null); // Tell the listeners a new table has arrived.
catch (SQLException ex) {
System.err.println(ex);
public void close() throws SQLException {
System.out.println("Closing db connection");
resultSet.close();
statement.close();
connection.close();
protected void finalize() throws Throwable {
close();
super.finalize();
// Implementation of the TableModel Interface
// MetaData
public String getColumnName(int column) {
if (columnNames[column] != null) {
return columnNames[column];
} else {
return "";
public Class getColumnClass(int column) {
int type;
try {
type = metaData.getColumnType(column+1);
catch (SQLException e) {
return super.getColumnClass(column);
switch(type) {
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
return String.class;
case Types.BIT:
return Boolean.class;
case Types.TINYINT:
case Types.SMALLINT:
case Types.INTEGER:
return Integer.class;
case Types.BIGINT:
return Long.class;
case Types.FLOAT:
case Types.DOUBLE:
return Double.class;
case Types.DATE:
return java.sql.Date.class;
default:
return Object.class;
// to make the cells editable
public boolean isCellEditable(int row, int column) {
try {
return metaData.isWritable(column+1);
catch (SQLException e) {
return false;
public int getColumnCount() {
return columnNames.length;
// Data methods
public int getRowCount() {
return rows.size();
public Object getValueAt(int aRow, int aColumn) {
Vector row = (Vector)rows.elementAt(aRow);
return row.elementAt(aColumn);
public String dbRepresentation(int column, Object value) {
int type;
if (value == null) {
return "null";
try {
type = metaData.getColumnType(column+1);
catch (SQLException e) {
return value.toString();
switch(type) {
case Types.INTEGER:
case Types.DOUBLE:
case Types.FLOAT:
return value.toString();
case Types.BIT:
return ((Boolean)value).booleanValue() ? "1" : "0";
case Types.DATE:
return value.toString(); // This will need some conversion.
default:
return "\""+value.toString()+"\"";
public void setValueAt(Object value, int row, int column) {
try {
String tableName = metaData.getTableName(column+1);
// Some of the drivers seem buggy, tableName should not be null.
if (tableName == null) {
System.out.println("Table name returned null.");
String columnName = getColumnName(column);
String query =
"update "+tableName+
" set "+columnName+" = "+dbRepresentation(column, value)+
" where ";
// We don't have a model of the schema so we don't know the
// primary keys or which columns to lock on. To demonstrate
// that editing is possible, we'll just lock on everything.
for(int col = 0; col<getColumnCount(); col++) {
String colName = getColumnName(col);
if (colName.equals("")) {
continue;
if (col != 0) {
query = query + " and ";
query = query + colName +" = "+
dbRepresentation(col, getValueAt(row, col));
System.out.println(query);
System.out.println("Not sending update to database");
// statement.executeQuery(query);
catch (SQLException e) {
// e.printStackTrace();
System.err.println("Update failed");
Vector dataRow = (Vector)rows.elementAt(row);
dataRow.setElementAt(value, column);
}

Java 1.5 incorporates a very simple way to print from a JTable. I am using a mysql DB but it is the same concept. Review my code and let me know if you have any questions.
package emsmain;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.sql.*;
import java.text.MessageFormat;
import java.util.*;
import javax.print.*;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.swing.*;
import javax.swing.JTable;
import javax.swing.table.*;
import java.awt.print.*;
public class TableFromDatabase extends JFrame implements ActionListener{
 JButton jbtprint = new JButton("Print Report");
 JTable Reporttable;
 Connection conn = Connect_Database.getConnection();
 public TableFromDatabase()
Vector columnNames = new Vector();
Vector data = new Vector();
 try{
 String query = null;
 Statement ps = null;
 ResultSet rs = null;
 //Class Master List
 if (Report_Menu.jrbMaster_list.isSelected()){
 query =("Select * from students") ;
 //Classes taken by student
 if (Report_Menu.jrbClass_taken.isSelected()){
 String taken = Report_Menu.jtfStudent.getText();
 query = ("select program.course_num, course_name, course_start_date, course_stat_desc from registration, program where student_id = '"+taken+"' and program.course_num = registration.course_num");
 //Birthday report
 if (Report_Menu.jrbBirthday.isSelected()){
 String birthday = (String) Report_Menu.jcb_birthday.getSelectedItem();
 query = ("SELECT student_id, fname, lname, address, city, state_name, zipcode, dob FROM students where substring(dob, 6,2) = '"+birthday+"'");
 //Course Catologue
 if (Report_Menu.jrbCourseCatologue.isSelected()){
 String course = (String) Report_Menu.jcbChooseCourse.getSelectedItem();
 query = ("select course_name, course_length, course_cost, course_credits from course where course_name = '"+course+"'");
 //Certification expiration report
 if (Report_Menu.jrbExpiration.isSelected()){
 String month = (String) Report_Menu.jcbMonth.getSelectedItem();
 String year = (String) Report_Menu.jcbYear.getSelectedItem();
 query = ("SELECT FNAME, LNAME FROM STUDENTS, REGISTRATION WHERE substring(expiration_date, 6,2) = '"+month+"' and substring(expiration_date, 1,4) = '"+year+"' and registration.student_id = students.student_id") ;
 //Class Roster
 if (Report_Menu.jrbRoster.isSelected()){
 String c_number = Report_Menu.jtfClassNumber.getText();
 query = ("Select course_name, course_start_date, fname, lname from program, registration, students where program.course_num = '"+c_number+"' and registration.student_id = students.student_id;");
 //Squad list and counts
 if (Report_Menu.jrbSquadCount.isSelected()){
 query = ("SELECT Squad_Name, count(student_id) from students group by Squad_Name");
 //Student List
 if (Report_Menu.jrbStudent_list.isSelected()){
 String Choose_month = (String) Report_Menu.jcbcourse_month.getSelectedItem();
 String Choose_Course = (String) Report_Menu.jcbcourse_name.getSelectedItem();
 query = ("select count(student_id) from (registration, program) where program .course_name = '"+Choose_Course+"' and substring(course_start_date, 6,2) = '"+Choose_month+"'and registration.course_num = program.course_num;");
 ps = conn.createStatement();
 //Run Selected Report
 ps.execute(query);
 rs = ps.executeQuery(query);
 ResultSetMetaData md = rs.getMetaData();
 int columns = md.getColumnCount();
 // Get column names
 for (int i = 1; i <= columns; i++)
 columnNames.addElement( md.getColumnName(i) );
 // Get row data
 while (rs.next())
 Vector row = new Vector(columns);
 for (int i = 1; i <= columns; i++)
 row.addElement( rs.getObject(i) );
 //add row data to JTable
 data.addElement( row );
 rs.close();
 ps.close();
 catch(Exception e)
 JOptionPane.showMessageDialog(null,e.getMessage());
 // Create Jtable with database data
 Container c = getContentPane();
 c.setLayout(new BorderLayout());
 Reporttable = new JTable(data, columnNames);
 JScrollPane scrollPane = new JScrollPane( Reporttable );
 c.add( scrollPane );
 JPanel buttonPanel = new JPanel();
 buttonPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
 buttonPanel.add(jbtprint);
 c.add(buttonPanel,BorderLayout.SOUTH);
 jbtprint.addActionListener(this);
 public void actionPerformed(ActionEvent e){
 if(e.getActionCommand().equals("Print Report")){
 PrintForm();
public void PrintForm(){
 try {
 String name = null;
 // Will display correct heading for print job
 if (Report_Menu.jrbMaster_list.isSelected()){
 name = "Master List";
 if (Report_Menu.jrbBirthday.isSelected()){
 name = "Birthday List";
 if (Report_Menu.jrbClass_taken.isSelected()){
 name = "Classes taken by Student";
 if (Report_Menu.jrbCourseCatologue.isSelected()){
 name = "Course Catalogue";
 if (Report_Menu.jrbExpiration.isSelected()){
 name = "Certification Expiration Report";
 if (Report_Menu.jrbRoster.isSelected()){
 name = "Class Roster";
 if (Report_Menu.jrbSquadCount.isSelected()){
 name = "Squad list with Student Counts";
 if (Report_Menu.jrbStudent_list.isSelected()){
 name = "Student count by Course";
 // fetch the printable
 Printable printable = Reporttable.getPrintable(JTable.PrintMode.FIT_WIDTH,
 new MessageFormat(name),
 new MessageFormat("Page - {0}"));
 // fetch a PrinterJob
 PrinterJob job = PrinterJob.getPrinterJob();
 // set the Printable on the PrinterJob
 job.setPrintable(printable);
 // create an attribute set to store attributes from the print dialog
 PrintRequestAttributeSet attr = new HashPrintRequestAttributeSet();
 // display a print dialog and record whether or not the user cancels it
 boolean printAccepted = job.printDialog(attr);
 // if the user didn't cancel the dialog
 if (printAccepted) {
 try {
 // do the printing (may need to handle PrinterException)
 job.print(attr);
 } catch (PrinterException ex) {
 ex.printStackTrace();
 } finally {
 // restore the original table state here (for example, restore selection)
}

Problem with fireTableDataChanged in JTable

Hi everybody,
i have a really frustrating problem with Jtable. I created a class to display the jtable and a class that extends AbstactTableModel to use as its model. I can update my table after a fireTableDataChanged method in the class that extend the AbstractTableModel, but after implementing a ListSelectionListener to the class that displays the jtable, it gives a big bunch of errors in the console of my ide, when i remove it, it went back to normal without any errors.
Anyways, my program still can run without problem and the table still can refresh, just this bunch of errors when i clicked the button that calls the AbstactTableModel to perform a firetabledatachanged
anybody got this problem? how did you guys solve it?
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
at farm.EmployeesTblModel.getValueAt(EmployeesTblModel.java:58)
at farm.EmployeesTblView.rowEditDelete(EmployeesTblView.java:131)
at farm.EmployeesTblView$1.valueChanged(EmployeesTblView.java:106)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:147)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:194)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:388)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:398)
at javax.swing.DefaultListSelectionModel.removeSelectionIntervalImpl(DefaultListSelectionModel.java:559)
at javax.swing.DefaultListSelectionModel.clearSelection(DefaultListSelectionModel.java:403)
at javax.swing.JTable.clearSelection(JTable.java:2040)
at javax.swing.JTable.clearSelectionAndLeadAnchor(JTable.java:2048)
at javax.swing.JTable.sortedTableChanged(JTable.java:4098)
at javax.swing.JTable.tableChanged(JTable.java:4346)
at javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableModel.java:280)
at javax.swing.table.AbstractTableModel.fireTableDataChanged(AbstractTableModel.java:182)
at farm.EmployeesTblModel.updateData(EmployeesTblModel.java:42)
at farm.EmployeesTblView.updateData(EmployeesTblView.java:59)
at farm.EmployeesTbl.delete(EmployeesTbl.java:273)
at farm.FarmView.delEmpBtnActionPerformed(FarmView.java:1823)
at farm.FarmView.access$2200(FarmView.java:32)
at farm.FarmView$18.actionPerformed(FarmView.java:823)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6038)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3260)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

just this bunch of errors when i clicked the button that calls the AbstactTableModel to perform a firetabledatachangedWell, you should never have a button that invokes fireTableDataChanged.
The TableModel should be responsible for invoking those methods.
I suggest you look at the code for the DefaultTableModel for the proper way to write a TableModel. Basically you create methods to update the model. The model in turn fires the events to notify the view to repaint itself.

Problem with setCursor for JButton in cell on JTable

i have a problem with setCursor to JButton that is in a cell of the JTable}
this is the code
public class JButtonCellRenderer extends JButton implements TableCellRenderer {
public JButtonCellRenderer() {
setOpaque(true);
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int column) {
if (isSelected) {
setForeground(table.getSelectionForeground());
setBackground(table.getSelectionBackground());
else {
setForeground(table.getForeground());
setBackground(Color.WHITE);
setBorder(null);
if(table.getValueAt(row,column) == null){
setText("");
if(isSelected){
setBackground(table.getSelectionBackground());
}else{
setBackground(Color.WHITE);
}else{
if(table.getValueAt(row,column) instanceof JButton){
JButton _button = (JButton)table.getValueAt(row,column);
if(_button.getText().trim().equals("")){
setText("<html>"+ "Ver..."+"");
}else{
setText("<html>"+ "" + _button.getText() + ""+"");
return this;
}

Not quite sure I understand the problem, but I guess you have tried to call setCursor on your renderer and found it didn't work? The reason, I think, is that the renderer only renders a JButton. The thing that ends up in the table is in fact only a "picture" of a JButton, and among other things it won't receive and interact with any events, such as MouseEvents (so it wouldn't know that the cursor should change).
There are at least two alternatives for you: You can perhaps use a CellEditor instead of a CellRenderer. Or you can add a MouseListener to the table and then use the methods column/rowAtPoint to figure out if the cursor is over your JButton cell and change the cursor yourself if it is.

Selection Problem with JTable

Hello,
i have a selection problem with JTable. I want to allow only single cell selection and additionally limit the selection to the first column.
I preffered the style from MS Outlook Express where you can select the email accounts to edit.
It is a table like this:
Account name |   Type |   ...
--------------|---------|---------------------
Hotmail       |   POP3 |
GMX           |   IMAP |The selection should be only avaibable at 'Hotmail' or 'GMX' - not at 'POP3', 'IMAP' or as complete row selection.
Please help me!
Thanks.
Warlock

Maybe this will helpimport java.awt.*;
import javax.swing.*;
public class Test3 extends JFrame {
public Test3() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = getContentPane();
    String[] head = {"One", "Two"};
    String[][] data = {{"R1-C1", "R1-C2"}, {"R2-C1", "R2-C2"}};
    JTable jt = new JTable(data, head);
    jt.getColumnModel().setSelectionModel(new MyTableSelectionModel());
    content.add(new JScrollPane(jt), BorderLayout.CENTER);
    jt.setCellSelectionEnabled(true);
    jt.setRowSelectionAllowed(false);
    jt.setColumnSelectionAllowed(false);
    setSize(300, 300);
    setVisible(true);
public static void main(String[] arghs) { new Test3(); }
class MyTableSelectionModel extends DefaultListSelectionModel {
public void setSelectionInterval(int index0, int index1) {
    super.setSelectionInterval(0, 0);
}

Scrollbar problem with JTable.

Hi,
I have 45 columns in a JTable. Please remember this is customize, we can change the number of columns dynamically, at max they can be 2 columns.
i was having a problem with display the columns names in my Frame. I posted at http://forum.java.sun.com/thread.jspa?threadID=5167358&messageID=9641265#9641265
I got the solution. Thanks for that.
But as i said these columns are customized.
when i am having 2 columns in my JTable, table.setAutoResizeMode( JTable.AUTO_RESIZE_OFF ); is behaving differently, it's not occupying the complete JFrame. Lots of space is left out beside these 2 columns.
When i comment this line, then those 2 columns are occupying my complete Frame.
these two colmns should occupy my complete Frame and if i select 45 columns i should get scroll bar at botton with complete column NAMES.
Hope i am clear.
My Snippet
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.util.*;
public class SimpleTable extends JPanel {
 private boolean DEBUG = false;
 public SimpleTable() {
 super(new BorderLayout());
 String[][] values = new String[10][];
 String[] columnNames = {
 "First Name","Last Name","Sport","# of Years","Vegetarian","First Name","Last Name","Sport","# of Years","Vegetarian","First Name","Last Name","Sport","# of Years","Vegetarian","First Name","Last Name","Sport","# of Years","Vegetarian","First Name","Last Name","Sport","# of Years","Vegetarian","First Name","Last Name","Sport","# of Years","Vegetarian","First Name","Last Name","Sport","# of Years","Vegetarian","First Name","Last Name","Sport","# of Years","Vegetarian","First Name","Last Name","Sport","# of Years","Vegetarian"
 Object[][] data = {
 {"Mary", "Campione",
 "Snowboarding", new Integer(5), new Boolean(false)},
 {"Alison", "Huml",
 "Rowing", new Integer(3), new Boolean(true)},
 {"Kathy", "Walrath",
 "Knitting", new Integer(2), new Boolean(false)},
 {"Sharon", "Zakhour",
 "Speed reading", new Integer(20), new Boolean(true)},
 {"Philip", "Milne",
 "Pool", new Integer(10), new Boolean(false)},
 {"Mary", "Campione",
 "Snowboarding", new Integer(5), new Boolean(false)},
 {"Alison", "Huml",
 "Rowing", new Integer(3), new Boolean(true)},
 {"Kathy", "Walrath",
 "Knitting", new Integer(2), new Boolean(false)},
 {"Sharon", "Zakhour",
 "Speed reading", new Integer(20), new Boolean(true)},
 {"Philip", "Milne",
 "Pool", new Integer(10), new Boolean(false)},
 {"Mary", "Campione",
 "Snowboarding", new Integer(5), new Boolean(false)},
 {"Alison", "Huml",
 "Rowing", new Integer(3), new Boolean(true)},
 {"Kathy", "Walrath",
 "Knitting", new Integer(2), new Boolean(false)},
 {"Sharon", "Zakhour",
 "Speed reading", new Integer(20), new Boolean(true)},
 {"Philip", "Milne",
 "Pool", new Integer(10), new Boolean(false)},
 {"Mary", "Campione",
 "Snowboarding", new Integer(5), new Boolean(false)},
 {"Alison", "Huml",
 "Rowing", new Integer(3), new Boolean(true)},
 {"Kathy", "Walrath",
 "Knitting", new Integer(2), new Boolean(false)},
 {"Sharon", "Zakhour",
 "Speed reading", new Integer(20), new Boolean(true)},
 {"Philip", "Milne",
 "Pool", new Integer(10), new Boolean(false)},
 {"Mary", "Campione",
 "Snowboarding", new Integer(5), new Boolean(false)},
 {"Alison", "Huml",
 "Rowing", new Integer(3), new Boolean(true)},
 {"Kathy", "Walrath",
 "Knitting", new Integer(2), new Boolean(false)},
 {"Sharon", "Zakhour",
 "Speed reading", new Integer(20), new Boolean(true)},
 {"Philip", "Milne",
 "Pool", new Integer(10), new Boolean(false)},
 {"Mary", "Campione",
 "Snowboarding", new Integer(5), new Boolean(false)},
 {"Alison", "Huml",
 "Rowing", new Integer(3), new Boolean(true)},
 {"Kathy", "Walrath",
 "Knitting", new Integer(2), new Boolean(false)},
 {"Sharon", "Zakhour",
 "Speed reading", new Integer(20), new Boolean(true)},
 {"Philip", "Milne",
 "Pool", new Integer(10), new Boolean(false)},
 {"Mary", "Campione",
 "Snowboarding", new Integer(5), new Boolean(false)},
 {"Alison", "Huml",
 "Rowing", new Integer(3), new Boolean(true)},
 {"Kathy", "Walrath",
 "Knitting", new Integer(2), new Boolean(false)},
 {"Sharon", "Zakhour",
 "Speed reading", new Integer(20), new Boolean(true)},
 {"Philip", "Milne",
 "Pool", new Integer(10), new Boolean(false)},
 {"Mary", "Campione",
 "Snowboarding", new Integer(5), new Boolean(false)},
 {"Alison", "Huml",
 "Rowing", new Integer(3), new Boolean(true)},
 {"Kathy", "Walrath",
 "Knitting", new Integer(2), new Boolean(false)},
 {"Sharon", "Zakhour",
 "Speed reading", new Integer(20), new Boolean(true)},
 {"Philip", "Milne",
 "Pool", new Integer(10), new Boolean(false)},
 {"Mary", "Campione",
 "Snowboarding", new Integer(5), new Boolean(false)},
 {"Alison", "Huml",
 "Rowing", new Integer(3), new Boolean(true)},
 {"Kathy", "Walrath",
 "Knitting", new Integer(2), new Boolean(false)},
 {"Sharon", "Zakhour",
 "Speed reading", new Integer(20), new Boolean(true)},
 {"Philip", "Milne",
 "Pool", new Integer(10), new Boolean(false)}
 DefaultTableModel defaulttablemodel = new DefaultTableModel(data,columnNames);
 final JTable table = new JTable(defaulttablemodel)
 public boolean isCellEditable(int row,int column)
 return false;
 table.setPreferredScrollableViewportSize(new Dimension(500, 70));
 //table.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
 JScrollPane scrollPane = new JScrollPane(table);
 add(scrollPane);
 private static void createAndShowGUI() {
 JFrame frame = new JFrame("SimpleTable");
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 SimpleTable newContentPane = new SimpleTable();
 newContentPane.setOpaque(true); //content panes must be opaque
 frame.setContentPane(newContentPane);
 frame.pack();
 frame.setVisible(true);
 public static void main(String[] args) {
 javax.swing.SwingUtilities.invokeLater(new Runnable() {
 public void run() {
 createAndShowGUI();
}

Thank You camickr, it's serving my purpose.
Just for a clarrification :
table.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
table.setAutoscrolls(false);without using these lines also my purpose is serving.....then y do we need above two lines of code. r they necessary
i mean, this snippet is sufficient.
public boolean getScrollableTracksViewportWidth()
 return getPreferredSize().width < getParent().getWidth();
}

Problems with JTable Renderer

I have a problem with applying a custom renderer. I know the renderer works so thats not the problem. If I do like this:
DefaultTableModel aDefaultTableModel = new DefaultTableModel(data, columnNames);
it works. But if I do like this:
DefaultTableModel aDefaultTableModel;
aDefaultTableModel.setDataVector(data, columNames);
is doesn't, why?

I think maybe it's not the renderer at all. It may be my custom TableModel thats causing problems. Now this doesn't work:
private JTable aTable;
private CustomTableModel aTableModel;
public MyProgram() {
aTableModel = new CustomTableModel();
aTable = new JTable(aTableModel);
aTableModel.setData(data, columnNames);
private class CustomTableModel {
private String[] columnNames = null;
private Object[][] data = null;
public CustomTableModel() {
columnNames = new String[0];
data = new Object[0][0];
... snip
public void setData(Object[][] data, String[] columnNames) {
this.data = data;
this.columnNames = columnNames;
fireTableDataChanged();
... snip
Now, why doesn't that setData method work??

Another problem with JTable

Hi,
I have encountered a problem with JTable, i am trying to display some 15 columns and their values , one of the columns value is null, then the JTable is not displaying its value from this column(which is with null value) onwards.
Can anybody assiss me in this matter.
Regards
khiz_eng

I don't know If I can fix your problem, but
I know just that it works on my PC.... It's very very
slow... I don't know how to insert PageSetUp option... I have to study the problem.....
However I don't think it's a hard problem....
I want ask to you if you have found some problems when you are in Editing mode in a cell.....
in the jdk1.2 version I could save while was in editing mode using the editingStopped method.
It permit to update all data .... also the data in the cell I was editing.
in the jdk 1.3 if I use this method It doesn't work properly... It maybe destroy the content object in the Cell..... because I'm able to print all the table except the editing cell (it throw an exception...)
What's changed????
I don't know...
Can u help me?

Flipping problems with JTables

I have a JTable (with scroll bar ) and a JButton inside a Jframe.
When I push the JButton another JFrame appears with another JTable inside.
The problem is that when I close the upper JFrame and I try to move the scroll bar of the JTable inside the father JFrame it starts to flip doing an horrible effect for the general lauyout.The solution it could be overwrite the paint method....but actually for my Java knowledges is impossibe. Help !

Sorry I mean flashing problems (not flipping.)
The code is:
JPanel p1=new JPanel();
Label lab1=new Label(" LABORATORIO ANALISI CLINICHE");
Label lab2=new Label(" Dr.ssa xxxxxxxxxxxx ");
     Label lab3=new Label(" C/o xxxxxxxxxxxxx ");
     Label lab4=new Label(" Via xxxxxxxxxxx nr 5/7");
     Label lab5=new Label(" 86100 xxxxxxxxxx");
Label lab6=new Label(" tel. xxxxxxxxxx");
     p1.setLayout(new GridLayout(6,1));
p1.add(lab1);
p1.add(lab2);
p1.add(lab3);
p1.add(lab4);
p1.add(lab5);
p1.add(lab6);
Report myReport=new Report(tableModels[p.getSelectedIndex()],"Printer Manager",p1);
Actually Report is a class that prepare a JFrame with a JPanel and inside the JPanel there is a JScrollPane that get the JTable.That's the code for the Report class:
import javax.swing.*;
import javax.swing.table.*;
import java.awt.print.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.Dimension;
public class Report extends Frame implements Printable
JFrame frame;
JTable tableView;
JComponent component_dummy;
public Report(AbstractTableModel tableModel,String title,JComponent component)
super(title);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) { dispose(); } } );
final String[] headers = {"Description", "open price",
     "latest price", "End Date", "Quantity"};
final Object[][] data = {
{"Box of Biros", "1.00", "4.99", new Date(), new Integer(2)},
{"Blue Biro", "0.10", "0.14", new Date(), new Integer(1)},
{"legal pad", "1.00", "2.49", new Date(), new Integer(1)},
{"tape", "1.00", "1.49", new Date(), new Integer(1)},
{"stapler", "4.00", "4.49", new Date(), new Integer(1)},
{"legal pad", "1.00", "2.29", new Date(), new Integer(5)}
TableModel dataModel = new AbstractTableModel() {
public int getColumnCount() { return headers.length; }
public int getRowCount() { return data.length;}
public Object getValueAt(int row, int col) {
     return data[row][col];}
public String getColumnName(int column) {
     return headers[column];}
public Class getColumnClass(int col) {
return getValueAt(0,col).getClass();}
public boolean isCellEditable(int row, int col) {
return (col==1);}
public void setValueAt(Object aValue, int row, int column) {
data[row][column] = aValue;
dataModel=tableModel;
tableView = new JTable(dataModel);
// component_dummy= new JComponent();
component_dummy=component;
JScrollPane scrollpane = new JScrollPane(tableView);
scrollpane.setPreferredSize(new Dimension(600,300));
this.setLayout(new BorderLayout());
this.add(BorderLayout.NORTH,component);
this.add(BorderLayout.CENTER,scrollpane);
JButton printButton= new JButton();
printButton.setText("Stampa");
//this.getContentPane().add(BorderLayout.SOUTH,printButton);
this.add(BorderLayout.SOUTH,printButton);
// for faster printing turn double buffering off
RepaintManager.currentManager(
     frame).setDoubleBufferingEnabled(false);
printButton.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent evt) {
PrinterJob pj=PrinterJob.getPrinterJob();
pj.setPrintable(Report.this);
pj.printDialog();
try{
pj.print();
}catch (Exception PrintException) {}
this.setVisible(true);
this.pack();
public int print(Graphics g, PageFormat pageFormat,
int pageIndex) throws PrinterException
     Graphics2D g2 = (Graphics2D) g;
     g2.setColor(Color.black);
     int fontHeight=g2.getFontMetrics().getHeight();
     int fontDesent=g2.getFontMetrics().getDescent();
     //leave room for page number
     double pageHeight = pageFormat.getImageableHeight()-fontHeight;
     double pageWidth = pageFormat.getImageableWidth();
     double tableWidth = (double) tableView.getColumnModel().getTotalColumnWidth();
     double scale = 1;
     if (tableWidth >= pageWidth)
          scale = pageWidth / (tableWidth+(int)(pageWidth/2-pageWidth*0.43));
     double headerHeightOnPage=
tableView.getTableHeader().getHeight()*scale;
     double tableWidthOnPage=tableWidth*scale;
     double oneRowHeight=(tableView.getRowHeight()+
tableView.getRowMargin())*scale;
     int numRowsOnAPage=
(int)((pageHeight-headerHeightOnPage)/oneRowHeight);
     double pageHeightForTable=oneRowHeight*numRowsOnAPage;
     int totalNumPages= (int)Math.ceil((
(double)tableView.getRowCount())/numRowsOnAPage);
     if(pageIndex>=totalNumPages)
return NO_SUCH_PAGE;
g2.translate(0f,0f);
     g2.drawString("Laboratorio analisi Cliniche",(int)(pageWidth/2-pageWidth*0.33),
(int)(pageHeight+fontHeight-fontDesent-pageHeight*0.86));
g2.drawString("Dr.ssa xxxxxxxxx",(int)(pageWidth/2-pageWidth*0.33),
(int)(pageHeight+fontHeight-fontDesent-pageHeight*0.82));
g2.drawString("C/o xxxxxxxxxxxxxx",(int)(pageWidth/2-pageWidth*0.33),
(int)(pageHeight+fontHeight-fontDesent-pageHeight*0.78));
g2.drawString("Via xxxxxxxxxxx",(int)(pageWidth/2-pageWidth*0.33),
(int)(pageHeight+fontHeight-fontDesent-pageHeight*0.74));
g2.drawString("86100 xxxxxxxxx",(int)(pageWidth/2-pageWidth*0.33),
(int)(pageHeight+fontHeight-fontDesent-pageHeight*0.70));
g2.drawString("tel. 0874/316147-91720",(int)(pageWidth/2-pageWidth*0.33),
(int)(pageHeight+fontHeight-fontDesent-pageHeight*0.66));
//      g2.translate(0f,headerHeightOnPage);
     g2.translate((int)(pageWidth/2-pageWidth*0.33),-pageIndex*pageHeightForTable+(pageHeight+fontHeight-fontDesent-pageHeight*0.56));
     //If this piece of the table is smaller than the size available,
     //clip to the appropriate bounds.
     if (pageIndex + 1 == totalNumPages)
int lastRowPrinted = numRowsOnAPage * pageIndex;
int numRowsLeft = tableView.getRowCount() - lastRowPrinted;
g2.setClip(0,(int)(pageHeightForTable * pageIndex),
(int) Math.ceil(tableWidthOnPage),
(int) Math.ceil(oneRowHeight * numRowsLeft));
     //else clip to the entire area available.
     else
g2.setClip(0, (int)(pageHeightForTable*pageIndex),
(int) Math.ceil(tableWidthOnPage),
(int) Math.ceil(pageHeightForTable));
     g2.scale(scale,scale);
     tableView.paint(g2);
g2.scale(1/scale,1/scale);
     g2.translate(0,pageIndex*pageHeightForTable);
     g2.translate(0, -headerHeightOnPage);
     g2.setClip(0, 0,(int) Math.ceil(tableWidthOnPage),
(int)Math.ceil(headerHeightOnPage));
     g2.scale(scale,scale);
     tableView.getTableHeader().paint(g2); //paint header at top
     return Printable.PAGE_EXISTS;
public static void main(String[] args)
do you think that there are problems because the print method ? or mayby because I clipped the graphics area ?

A problem with JTable

Hi !
I have a problem with JTable - would like to use this component as a simple list of rows taken from a database : don't want to be able select or set a focus to a column - want only to be able select and set focus to a row ( just like in the menus). How to disable "focusability" for a cell with JTable ? Could You help me ?
thnx in advance

The Border is changed by the renderer, depending on whether the cell has focus or not. So you will need to create custom renderers without a Border. Something like:
class NoBorderRenderer extends DefaultTableCellRenderer
     public Component getTableCellRendererComponent(
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}

JTable selection problem with jdk1.5.0_05

Today I tried the new jdk1.5.0_05 release and noticed with a JTable I can only select a single column and row with the mouse. With jdk1.5.0_05 I could select multiple cols and rows with the mouse. I looking at the listselectionmodel for the jtable i see it is set to mulitple. Is this a bug in the new java 1.5 release?

Yeah, the .jar files are definitely there and the
small class I just wrote is in the Classes directory.Yes, but you're calling javac.exe, not some jars. Did you check that javac.exe is there? Stupid question, yes, but I've seen it all...
I changed the path in Control Panel -> System ->
Advanced -> Environment Variables. I've also beendoing this is the command prompt:
set
CLASSPATH=%CLASSPATH%;C:\Java\jdk1.5.0\bin;C:\Java\Cla
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