JTable header : text = two-rows, onClick action = sorting

Question

Hi guys.
I want to create a JTable where the user can have the data sorted by clicking upon a column's header. The code below shows the table I describe (you can click upon a column and sorting is performed).
import javax.swing.JFrame;
import java.awt.HeadlessException;
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Vector;
import javax.swing.table.DefaultTableModel;
//--------- TableSorter ----------
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
import javax.swing.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.*;
//---------- Table Height - Column Width
import javax.swing.table.TableColumn;
import java.awt.FontMetrics;
import javax.swing.JTable;
import java.awt.Dimension;
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2006</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
public class Test extends JFrame {
  JPanel jPanel1 = new JPanel();
  JPanel jPanel2 = new JPanel();
  JButton jButton1 = new JButton();
  FlowLayout flowLayout1 = new FlowLayout();
  BorderLayout borderLayout1 = new BorderLayout();
  BorderLayout borderLayout2 = new BorderLayout();
  //------------- MY VARIABLES -------------
  String[] columnNames_objectArr = new String[] {
      "Col1",
      "Column 2",
      "Column 3",
      "C4",
      "Col5",
      "Col 6",
  Vector columnNames_vector = new Vector();
  private Vector data_vector = new Vector();
  private Object[][] data_objectArr;
  public TableHeight_ColumnWidth tcw;
  private int totalTableWidth = 0, totalTableHeight = 0;
  private JComboBox jcmbxData = new JComboBox(
      new String[] {"Not Configured", "Switch", "Modem"});
  private int maxVisibleRows = 51;
  TableSorter model;
  private JTable table;
  JScrollPane jScrollPane1;
  public Test(String[] args) throws HeadlessException {
    try {
      jbInit();
      setupGUI();
      launchGUI();
    catch(Exception e) {
      e.printStackTrace();
  private void jbtnClose_actionPerformed(ActionEvent e) {
    dispose();
  private void launchGUI() {
    pack();
    setVisible(true);
    setResizable(false);
  private void setupGUI() {
    columnNames_vector.addElement("Col1");
    columnNames_vector.addElement("Column 2");
    columnNames_vector.addElement("Column 3");
    columnNames_vector.addElement("C4");
    columnNames_vector.addElement("Col5");
    columnNames_vector.addElement("Col 6");
    Vector row_data1 = new Vector();
    Vector row_data2 = new Vector();
    Vector row_data3 = new Vector();
    Vector row_data4 = new Vector();
    Vector row_data5 = new Vector();
    Vector row_data6 = new Vector();
    row_data1.add("Mary");
    row_data1.add("Campioneato");
    row_data1.add("Snowboarding");
    row_data1.add(new Integer(578987899));
    row_data1.add(new Boolean(false));
    row_data1.add("Not Configured");
    row_data2.add("Alison");
    row_data2.add("Huml");
    row_data2.add("Rowing");
    row_data2.add(new Integer(3));
    row_data2.add(new Boolean(true));
    row_data2.add("Switch");
    row_data3.add("Ka");
    row_data3.add("Walrath");
    row_data3.add("Knitting");
    row_data3.add(new Integer(2));
    row_data3.add(new Boolean(false));
    row_data3.add("Modem");
    row_data4.add("Sharon");
    row_data4.add("Zakhouras");
    row_data4.add("Speed reading");
    row_data4.add(new Integer(20));
    row_data4.add(new Boolean(true));
    row_data4.add("Switch");
    row_data5.add("Philip");
    row_data5.add("Milner");
    row_data5.add("Pool");
    row_data5.add(new Integer(10));
    row_data5.add(new Boolean(false));
    row_data5.add("Not Configured");
    data_vector.add(row_data1);
    data_vector.add(row_data2);
    data_vector.add(row_data3);
    data_vector.add(row_data4);
    data_vector.add(row_data5);
    model = new TableSorter(new SortTableModel(data_vector, columnNames_vector));
    table = new JTable(model);
    tcw = new TableHeight_ColumnWidth(model, table);
    jScrollPane1 = new JScrollPane(table);
    model.setTableHeader(table.getTableHeader());
    jPanel1.add(jScrollPane1, BorderLayout.CENTER);
    //Add a JComboBox as a cellEditor...
    DefaultCellEditor dce = new DefaultCellEditor(jcmbxData);
    table.getColumnModel().getColumn(5).setCellEditor(dce);
    //..... add the IPJPanel as cellEditor.....
    tcw.fixTableLook(maxVisibleRows);
  private void jbInit() throws Exception {
    this.getContentPane().setLayout(borderLayout2);
    jPanel1.setLayout(borderLayout1);
    jPanel2.setLayout(flowLayout1);
    jButton1.setText("Close");
    jPanel1.setBorder(BorderFactory.createRaisedBevelBorder());
    this.getContentPane().add(jPanel1, BorderLayout.CENTER);
    this.getContentPane().add(jPanel2, BorderLayout.SOUTH);
    jPanel2.add(jButton1, null);
    jButton1.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jbtnClose_actionPerformed(e);
  public static void main( String[] args ) {
    new Test(args);
  public boolean getScrollableTracksViewportHeight() {
    Component parent = getParent();
    if (parent instanceof JViewport) {
      return parent.getHeight() > getPreferredSize().height;
    return false;
  //------------------ MY TABLE MODEL ------------------
  public class SortTableModel extends DefaultTableModel {
    private boolean DEBUG = false;
    public SortTableModel(Object[][] data, String[] columnNames) {
      super(data, columnNames);
    public SortTableModel(Vector data, Vector columnNames) {
      super(data, columnNames);
  //------------------ TABLE SORTER -----------------------
  public class TableSorter extends AbstractTableModel {
      protected TableModel tableModel;
      public static final int DESCENDING = -1;
      public static final int NOT_SORTED = 0;
      public static final int ASCENDING = 1;
      private Directive EMPTY_DIRECTIVE = new Directive(-1, NOT_SORTED);
      public final Comparator COMPARABLE_COMAPRATOR = new Comparator() {
          public int compare(Object o1, Object o2) {
              return ((Comparable) o1).compareTo(o2);
      public final Comparator LEXICAL_COMPARATOR = new Comparator() {
          public int compare(Object o1, Object o2) {
              return o1.toString().compareTo(o2.toString());
      private Row[] viewToModel;
      private int[] modelToView;
      private JTableHeader tableHeader;
      private MouseListener mouseListener;
      private TableModelListener tableModelListener;
      private Map columnComparators = new HashMap();
      private List sortingColumns = new ArrayList();
      public TableSorter() {
          this.mouseListener = new MouseHandler();
          this.tableModelListener = new TableModelHandler();
      public TableSorter(TableModel tableModel) {
          this();
          setTableModel(tableModel);
      public TableSorter(TableModel tableModel, JTableHeader tableHeader) {
          this();
          setTableHeader(tableHeader);
          setTableModel(tableModel);
      private void clearSortingState() {
          viewToModel = null;
          modelToView = null;
      public TableModel getTableModel() {
          return tableModel;
      public void setTableModel(TableModel tableModel) {
          if (this.tableModel != null) {
              this.tableModel.removeTableModelListener(tableModelListener);
          this.tableModel = tableModel;
          if (this.tableModel != null) {
              this.tableModel.addTableModelListener(tableModelListener);
          clearSortingState();
          fireTableStructureChanged();
      public JTableHeader getTableHeader() {
          return tableHeader;
      public void setTableHeader(JTableHeader tableHeader) {
          if (this.tableHeader != null) {
              this.tableHeader.removeMouseListener(mouseListener);
              TableCellRenderer defaultRenderer = this.tableHeader.getDefaultRenderer();
              if (defaultRenderer instanceof SortableHeaderRenderer) {
                  this.tableHeader.setDefaultRenderer(((SortableHeaderRenderer) defaultRenderer).tableCellRenderer);
          this.tableHeader = tableHeader;
          if (this.tableHeader != null) {
              this.tableHeader.addMouseListener(mouseListener);
              this.tableHeader.setDefaultRenderer(
                      new SortableHeaderRenderer(this.tableHeader.getDefaultRenderer()));
      public boolean isSorting() {
          return sortingColumns.size() != 0;
      private Directive getDirective(int column) {
          for (int i = 0; i < sortingColumns.size(); i++) {
              Directive directive = (Directive)sortingColumns.get(i);
              if (directive.column == column) {
                  return directive;
          return EMPTY_DIRECTIVE;
      public int getSortingStatus(int column) {
          return getDirective(column).direction;
      private void sortingStatusChanged() {
          clearSortingState();
          fireTableDataChanged();
          if (tableHeader != null) {
              tableHeader.repaint();
      public void setSortingStatus(int column, int status) {
          Directive directive = getDirective(column);
          if (directive != EMPTY_DIRECTIVE) {
              sortingColumns.remove(directive);
          if (status != NOT_SORTED) {
              sortingColumns.add(new Directive(column, status));
          sortingStatusChanged();
      protected Icon getHeaderRendererIcon(int column, int size) {
          Directive directive = getDirective(column);
          if (directive == EMPTY_DIRECTIVE) {
              return null;
          return new Arrow(directive.direction == DESCENDING, size, sortingColumns.indexOf(directive));
      private void cancelSorting() {
          sortingColumns.clear();
          sortingStatusChanged();
      public void setColumnComparator(Class type, Comparator comparator) {
          if (comparator == null) {
              columnComparators.remove(type);
          } else {
              columnComparators.put(type, comparator);
      protected Comparator getComparator(int column) {
          Class columnType = tableModel.getColumnClass(column);
          Comparator comparator = (Comparator) columnComparators.get(columnType);
          if (comparator != null) {
              return comparator;
          if (Comparable.class.isAssignableFrom(columnType)) {
              return COMPARABLE_COMAPRATOR;
          return LEXICAL_COMPARATOR;
      private Row[] getViewToModel() {
          if (viewToModel == null) {
              int tableModelRowCount = tableModel.getRowCount();
              viewToModel = new Row[tableModelRowCount];
              for (int row = 0; row < tableModelRowCount; row++) {
                  viewToModel[row] = new Row(row);
              if (isSorting()) {
                  Arrays.sort(viewToModel);
          return viewToModel;
      public int modelIndex(int viewIndex) {
          return getViewToModel()[viewIndex].modelIndex;
      private int[] getModelToView() {
          if (modelToView == null) {
              int n = getViewToModel().length;
              modelToView = new int[n];
              for (int i = 0; i < n; i++) {
                  modelToView[modelIndex(i)] = i;
          return modelToView;
      // TableModel interface methods
      public int getRowCount() {
          return (tableModel == null) ? 0 : tableModel.getRowCount();
      public int getColumnCount() {
          return (tableModel == null) ? 0 : tableModel.getColumnCount();
      public String getColumnName(int column) {
          return tableModel.getColumnName(column);
      public Class getColumnClass(int column) {
          return tableModel.getColumnClass(column);
      public boolean isCellEditable(int row, int column) {
          return tableModel.isCellEditable(modelIndex(row), column);
      public Object getValueAt(int row, int column) {
          return tableModel.getValueAt(modelIndex(row), column);
      public void setValueAt(Object aValue, int row, int column) {
          tableModel.setValueAt(aValue, modelIndex(row), column);
      // Helper classes
      private class Row implements Comparable {
          private int modelIndex;
          public Row(int index) {
              this.modelIndex = index;
          public int compareTo(Object o) {
              int row1 = modelIndex;
              int row2 = ((Row) o).modelIndex;
              for (Iterator it = sortingColumns.iterator(); it.hasNext();) {
                  Directive directive = (Directive) it.next();
                  int column = directive.column;
                  Object o1 = tableModel.getValueAt(row1, column);
                  Object o2 = tableModel.getValueAt(row2, column);
                  int comparison = 0;
                  // Define null less than everything, except null.
                  if (o1 == null && o2 == null) {
                      comparison = 0;
                  } else if (o1 == null) {
                      comparison = -1;
                  } else if (o2 == null) {
                      comparison = 1;
                  } else {
                      comparison = getComparator(column).compare(o1, o2);
                  if (comparison != 0) {
                      return directive.direction == DESCENDING ? -comparison : comparison;
              return 0;
      private class TableModelHandler implements TableModelListener {
          public void tableChanged(TableModelEvent e) {
              // If we're not sorting by anything, just pass the event along.
              if (!isSorting()) {
                  clearSortingState();
                  fireTableChanged(e);
                  return;
              // If the table structure has changed, cancel the sorting; the
              // sorting columns may have been either moved or deleted from
              // the model.
              if (e.getFirstRow() == TableModelEvent.HEADER_ROW) {
                  cancelSorting();
                  fireTableChanged(e);
                  return;
              // We can map a cell event through to the view without widening
              // when the following conditions apply:
              // a) all the changes are on one row (e.getFirstRow() == e.getLastRow()) and,
              // b) all the changes are in one column (column != TableModelEvent.ALL_COLUMNS) and,
              // c) we are not sorting on that column (getSortingStatus(column) == NOT_SORTED) and,
              // d) a reverse lookup will not trigger a sort (modelToView != null)
              // Note: INSERT and DELETE events fail this test as they have column == ALL_COLUMNS.
              // The last check, for (modelToView != null) is to see if modelToView
              // is already allocated. If we don't do this check; sorting can become
              // a performance bottleneck for applications where cells
              // change rapidly in different parts of the table. If cells
              // change alternately in the sorting column and then outside of
              // it this class can end up re-sorting on alternate cell updates -
              // which can be a performance problem for large tables. The last
              // clause avoids this problem.
              int column = e.getColumn();
              if (e.getFirstRow() == e.getLastRow()
                      && column != TableModelEvent.ALL_COLUMNS
                      && getSortingStatus(column) == NOT_SORTED
                      && modelToView != null) {
                  int viewIndex = getModelToView()[e.getFirstRow()];
                  fireTableChanged(new TableModelEvent(TableSorter.this,
                                                       viewIndex, viewIndex,
                                                       column, e.getType()));
                  return;
              // Something has happened to the data that may have invalidated the row order.
              clearSortingState();
              fireTableDataChanged();
              return;
      private class MouseHandler extends MouseAdapter {
          public void mouseClicked(MouseEvent e) {
              JTableHeader h = (JTableHeader) e.getSource();
              TableColumnModel columnModel = h.getColumnModel();
              int viewColumn = columnModel.getColumnIndexAtX(e.getX());
              int column = columnModel.getColumn(viewColumn).getModelIndex();
              if (column != -1) {
                  int status = getSortingStatus(column);
                  if (!e.isControlDown()) {
                      cancelSorting();
                  // Cycle the sorting states through {NOT_SORTED, ASCENDING, DESCENDING} or
                  // {NOT_SORTED, DESCENDING, ASCENDING} depending on whether shift is pressed.
                  status = status + (e.isShiftDown() ? -1 : 1);
                  status = (status + 4) % 3 - 1; // signed mod, returning {-1, 0, 1}
                  setSortingStatus(column, status);
      private class Arrow implements Icon {
          private boolean descending;
          private int size;
          private int priority;
          public Arrow(boolean descending, int size, int priority) {
              this.descending = descending;
              this.size = size;
              this.priority = priority;
          public void paintIcon(Component c, Graphics g, int x, int y) {
              Color color = c == null ? Color.GRAY : c.getBackground();
              // In a compound sort, make each succesive triangle 20%
              // smaller than the previous one.
              int dx = (int)(size/2*Math.pow(0.8, priority));
              int dy = descending ? dx : -dx;
              // Align icon (roughly) with font baseline.
              y = y + 5*size/6 + (descending ? -dy : 0);
              int shift = descending ? 1 : -1;
              g.translate(x, y);
              // Right diagonal.
              g.setColor(color.darker());
              g.drawLine(dx / 2, dy, 0, 0);
              g.drawLine(dx / 2, dy + shift, 0, shift);
              // Left diagonal.
              g.setColor(color.brighter());
              g.drawLine(dx / 2, dy, dx, 0);
              g.drawLine(dx / 2, dy + shift, dx, shift);
              // Horizontal line.
              if (descending) {
                  g.setColor(color.darker().darker());
              } else {
                  g.setColor(color.brighter().brighter());
              g.drawLine(dx, 0, 0, 0);
              g.setColor(color);
              g.translate(-x, -y);
          public int getIconWidth() {
              return size;
          public int getIconHeight() {
              return size;
      private class SortableHeaderRenderer implements TableCellRenderer {
          private TableCellRenderer tableCellRenderer;
          public SortableHeaderRenderer(TableCellRenderer tableCellRenderer) {
              this.tableCellRenderer = tableCellRenderer;
          public Component getTableCellRendererComponent(JTable table,
                                                         Object value,
                                                         boolean isSelected,
                                                         boolean hasFocus,
                                                         int row,
                                                         int column) {
              Component c = tableCellRenderer.getTableCellRendererComponent(table,
                      value, isSelected, hasFocus, row, column);
              if (c instanceof JLabel) {
                  JLabel l = (JLabel) c;
                  l.setHorizontalTextPosition(JLabel.LEFT);
                  int modelColumn = table.convertColumnIndexToModel(column);
                  l.setIcon(getHeaderRendererIcon(modelColumn, l.getFont().getSize()));
              return c;
      private class Directive {
          private int column;
          private int direction;
          public Directive(int column, int direction) {
              this.column = column;
              this.direction = direction;
  //-------------- FIX TABLE'S HEIGHT & COLUMN WIDTH ---------
  public class TableHeight_ColumnWidth {
    private TableSorter sorter;
    private FontMetrics fm;
    private JTable table;
    private int numOfRows = 0, totalTableHeight = 0, totalTableWidth = 0;
     * Constructor --- it needs the model as well the JTable as parameters
     * @param sorter - the model
     * @param table - the JTable created based on the model
    public TableHeight_ColumnWidth(TableSorter sorter, JTable table) {
      this.sorter = sorter;
      this.table = table;
      this.fm = table.getFontMetrics(table.getFont());
      this.numOfRows = table.getRowCount();
     * Calculates the width of each column according to the String it contains
     * @param col = the desired column
     * @param fm = the FontMetrics of this column
     * @return - the width of the single column
    public int determineColumnWidth(TableColumn col, FontMetrics fm) {
      int headerWidth = fm.stringWidth((String)col.getHeaderValue());
      int columnNumber = col.getModelIndex();
      int max = headerWidth;
      int columnWidth = 0;
      String cell = "";
      Integer cell_int = new Integer(0);
      Short cell_short = new Short((short)0);
      for (int i = 0; i != sorter.getRowCount(); i++) {
        Object obj = (Object) sorter.getValueAt(i, columnNumber);
        if (obj instanceof String) {
          cell = (String)sorter.getValueAt(i, columnNumber);
        else if (obj instanceof Integer) {
          cell_int = (Integer)sorter.getValueAt(i, columnNumber);
          cell = String.valueOf(cell_int.intValue());
        else if (obj instanceof Short) {
          cell_short = (Short) sorter.getValueAt(i, columnNumber);
          cell = String.valueOf(cell_short.shortValue());
        columnWidth = fm.stringWidth(cell) + 5;
        if (columnWidth > max) {
          max = columnWidth;
      return max + 5;
     * Calculates the total width of the table according to the width of each
     * column.
     * @return - totalTableWidth
    private int fixColumnWidth () {
      int totalTableWidth = 0;
      TableColumn c = null;
      int cw = 0;
      for (int i = 0; i < table.getColumnCount(); i++) {
        c = table.getColumn(table.getColumnName(i));
        cw = this.determineColumnWidth(c, fm);
        c.setPreferredWidth(cw);
        totalTableWidth = totalTableWidth + cw;
        c.setMinWidth(cw);
      return totalTableWidth;
     * Calculates the height of the table according to the height of each row
     * multiplied by 51 (by default) or by the totalRowsCount.
     * @return - totalTableHeight
    private int fixTableHeight(int maxVisibleRows) {
      int rowHeight = table.getRowHeight();
      //Show maxVisibleRows rows maximum
      if (numOfRows > maxVisibleRows) {
        totalTableHeight = rowHeight * maxVisibleRows;
      else {
        totalTableHeight = rowHeight * numOfRows;
      return totalTableHeight;
     * Sets up the table according to the totalTableWidth and totalTableHeight
    public void fixTableLook(int maxVisibleRows) {
      table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
      totalTableWidth = this.fixColumnWidth();
      totalTableHeight = this.fixTableHeight(maxVisibleRows);
      table.setPreferredScrollableViewportSize(new Dimension(totalTableWidth, totalTableHeight));
}Also, I want some column headers to display their text in two-rows. But by using the HTML technique look at the result in comparison with the previous table I had!
import javax.swing.JFrame;
import java.awt.HeadlessException;
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Vector;
import javax.swing.table.DefaultTableModel;
//--------- TableSorter ----------
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
import javax.swing.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.*;
//---------- Table Height - Column Width
import javax.swing.table.TableColumn;
import java.awt.FontMetrics;
import javax.swing.JTable;
import java.awt.Dimension;
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2006</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
public class Test extends JFrame {
  JPanel jPanel1 = new JPanel();
  JPanel jPanel2 = new JPanel();
  JButton jButton1 = new JButton();
  FlowLayout flowLayout1 = new FlowLayout();
  BorderLayout borderLayout1 = new BorderLayout();
  BorderLayout borderLayout2 = new BorderLayout();
  //------------- MY VARIABLES -------------
  String[] columnNames_objectArr = new String[] {
      "Col1",
      "Column 2",
      "Column 3",
      "C4",
      "Col5",
      "Col 6",
  Vector columnNames_vector = new Vector();
  private Vector data_vector = new Vector();
  private Object[][] data_objectArr;
  public TableHeight_ColumnWidth tcw;
  private int totalTableWidth = 0, totalTableHeight = 0;
  private JComboBox jcmbxData = new JComboBox(
      new String[] {"Not Configured", "Switch", "Modem"});
  private int maxVisibleRows = 51;
  TableSorter model;
  private JTable table;
  JScrollPane jScrollPane1;
  public Test(String[] args) throws HeadlessException {
    try {
      jbInit();
      setupGUI();
      launchGUI();
    catch(Exception e) {
      e.printStackTrace();
  private void jbtnClose_actionPerformed(ActionEvent e) {
    dispose();
  private void launchGUI() {
    pack();
    setVisible(true);
    setResizable(false);
  private void setupGUI() {
    columnNames_vector.addElement("<html>Col1</html>");
    columnNames_vector.addElement("<html>Column 2</html>");
    columnNames_vector.addElement("<html>Column 3<br>Second Row</html>");
    columnNames_vector.addElement("<html>C4</html>");
    columnNames_vector.addElement("<html>Col5</html>");
    columnNames_vector.addElement("<html>Col 6</html>");
    Vector row_data1 = new Vector();
    Vector row_data2 = new Vector();
    Vector row_data3 = new Vector();
    Vector row_data4 = new Vector();
    Vector row_data5 = new Vector();
    Vector row_data6 = new Vector();
    row_data1.add("Mary");
    row_data1.add("Campioneato");
    row_data1.add("Snowboarding");
    row_data1.add(new Integer(578987899));
    row_data1.add(new Boolean(false));
    row_data1.add("Not Configured");
    row_data2.add("Alison");
    row_data2.add("Huml");
    row_data2.add("Rowing");
    row_data2.add(new Integer(3));
    row_data2.add(new Boolean(true));
    row_data2.add("Switch");
    row_data3.add("Ka");
    row_data3.add("Walrath");
    row_data3.add("Knitting");
    row_data3.add(new Integer(2));
    row_data3.add(new Boolean(false));
    row_data3.add("Modem");
    row_data4.add("Sharon");
    row_data4.add("Zakhouras");
    row_data4.add("Speed reading");
    row_data4.add(new Integer(20));
    row_data4.add(new Boolean(true));
    row_data4.add("Switch");
    row_data5.add("Philip");
    row_data5.add("Milner");
    row_data5.add("Pool");
    row_data5.add(new Integer(10));
    row_data5.add(new Boolean(false));
    row_data5.add("Not Configured");
    data_vector.add(row_data1);
    data_vector.add(row_data2);
    data_vector.add(row_data3);
    data_vector.add(row_data4);
    data_vector.add(row_data5);
    model = new TableSorter(new SortTableModel(data_vector, columnNames_vector));
    table = new JTable(model);
    tcw = new TableHeight_ColumnWidth(model, table);
    jScrollPane1 = new JScrollPane(table);
    model.setTableHeader(table.getTableHeader());
    jPanel1.add(jScrollPane1, BorderLayout.CENTER);
    //Add a JComboBox as a cellEditor...
    DefaultCellEditor dce = new DefaultCellEditor(jcmbxData);
    table.getColumnModel().getColumn(5).setCellEditor(dce);
    //..... add the IPJPanel as cellEditor.....
    tcw.fixTableLook(maxVisibleRows);
  private void jbInit() throws Exception {
    this.getContentPane().setLayout(borderLayout2);
    jPanel1.setLayout(borderLayout1);
    jPanel2.setLayout(flowLayout1);
    jButton1.setText("Close");
    jPanel1.setBorder(BorderFactory.createRaisedBevelBorder());
    this.getContentPane().add(jPanel1, BorderLayout.CENTER);
    this.getContentPane().add(jPanel2, BorderLayout.SOUTH);
    jPanel2.add(jButton1, null);
    jButton1.addActionListener(new ActionListener() {
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

Answer 1

First of all I found out that when I set the column's header like this:
columnNames_vector.addElement("<html>Column 3<br>Second Row</html>"); //In the setupGUI() methodthe TableHeight_ColumnWidth.determineColumnWidth(TableColumn col, FontMetrics fm) method calculates the column's width by counting <html>, </html>, <br> characters as well. So I added a check to reject these characters and not count them for the column's width.
As for the header's height:
I found that when the first column's header is set to display two-lines, then the height of the rest columns headers is set to display two-lines as well. In other words, the height of the first column's header affects the height of the whole JTableHeader.
I found that the BasicTableHeaderUI.getHeaderHeight() method is called, within which there are these comments:
          // If the header value is empty (== "") in the
          // first column (and this column is set up
          // to use the default renderer) we will
          // return zero from this routine and the header
          // will disappear altogether. Avoiding the calculation
          // of the preferred size is such a performance win for
          // most applications that we will continue to
          // use this cheaper calculation, handling these
          // issues as `edge cases'. Should I override a class and if so which one? I am so confused! If anyone has any idea about how to set the header's height according to the cell's height that is the maximum among all, please let me know.