Ordenamento de um JTable

import javax.swing.table.*; 
import javax.swing.event.TableModelListener; 
import javax.swing.event.TableModelEvent; 

public class TableMap extends AbstractTableModel implements TableModelListener
{
  protected TableModel model; 

  public TableModel  getModel() {
    return model;
  }

  public void  setModel(TableModel model) {
    this.model = model; 
    model.addTableModelListener(this); 
  }

  // By default, Implement TableModel by forwarding all messages 
  // to the model. 

  public Object getValueAt(int aRow, int aColumn) {
    return model.getValueAt(aRow, aColumn); 
  }
	
  public void setValueAt(Object aValue, int aRow, int aColumn) {
    model.setValueAt(aValue, aRow, aColumn); 
  }

  public int getRowCount() {
    return (model == null) ? 0 : model.getRowCount(); 
  }

  public int getColumnCount() {
    return (model == null) ? 0 : model.getColumnCount(); 
  }
	
  public String getColumnName(int aColumn) {
    return model.getColumnName(aColumn); 
  }

  public Class getColumnClass(int aColumn) {
    return model.getColumnClass(aColumn); 
  }
	
  public boolean isCellEditable(int row, int column) { 
     return model.isCellEditable(row, column); 
  }
//
// Implementation of the TableModelListener interface, 
//

  // By default forward all events to all the listeners. 
  public void tableChanged(TableModelEvent e) {
    fireTableChanged(e);
  }
}

import java.util.*;

import javax.swing.table.TableModel;
import javax.swing.event.TableModelEvent;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.InputEvent;
import javax.swing.JTable;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

public class TableSorter extends TableMap
{
  int       indexes[];
  Vector      sortingColumns = new Vector();
  boolean     ascending = true;
  int compares;

  public TableSorter()
  {
    indexes = new int[0]; // For consistency.    
  }

  public TableSorter(TableModel model)
  {
    setModel(model);
  }

  public void setModel(TableModel model) {
    super.setModel(model); 
    reallocateIndexes(); 
  }

  public int compareRowsByColumn(int row1, int row2, int column)
  {
    Class type = model.getColumnClass(column);
    TableModel data = model;

    // Check for nulls

    Object o1 = data.getValueAt(row1, column);
    Object o2 = data.getValueAt(row2, column); 

    // If both values are null return 0
    if (o1 == null && o2 == null) {
      return 0; 
    }
    else if (o1 == null) { // Define null less than everything. 
      return -1; 
    } 
    else if (o2 == null) { 
      return 1; 
    }

/* We copy all returned values from the getValue call in case
an optimised model is reusing one object to return many values.
The Number subclasses in the JDK are immutable and so will not be used in 
this way but other subclasses of Number might want to do this to save 
space and avoid unnecessary heap allocation. 
*/
    if (type.getSuperclass() == java.lang.Number.class)
      {
        Number n1 = (Number)data.getValueAt(row1, column);
        double d1 = n1.doubleValue();
        Number n2 = (Number)data.getValueAt(row2, column);
        double d2 = n2.doubleValue();

        if (d1 < d2)
          return -1;
        else if (d1 > d2)
          return 1;
        else
          return 0;
      }
    else if (type == java.util.Date.class)
      {
        Date d1 = (Date)data.getValueAt(row1, column);
        long n1 = d1.getTime();
        Date d2 = (Date)data.getValueAt(row2, column);
        long n2 = d2.getTime();

        if (n1 < n2)
          return -1;
        else if (n1 > n2)
          return 1;
        else return 0;
      }
    else if (type == String.class)
      {
        String s1 = (String)data.getValueAt(row1, column);
        String s2  = (String)data.getValueAt(row2, column);
        int result = s1.compareTo(s2);

        if (result < 0)
          return -1;
        else if (result > 0)
          return 1;
        else return 0;
      }
    else if (type == Boolean.class)
      {
        Boolean bool1 = (Boolean)data.getValueAt(row1, column);
        boolean b1 = bool1.booleanValue();
        Boolean bool2 = (Boolean)data.getValueAt(row2, column);
        boolean b2 = bool2.booleanValue();

        if (b1 == b2)
          return 0;
        else if (b1) // Define false < true
          return 1;
        else
          return -1;
      }
    else
      {
        Object v1 = data.getValueAt(row1, column);
        String s1 = v1.toString();
        Object v2 = data.getValueAt(row2, column);
        String s2 = v2.toString();
        int result = s1.compareTo(s2);

        if (result < 0)
          return -1;
        else if (result > 0)
          return 1;
        else return 0;
      }
  }

  public int compare(int row1, int row2)
  {
    compares++;
    for(int level = 0; level < sortingColumns.size(); level++)
      {
        Integer column = (Integer)sortingColumns.elementAt(level);
        int result = compareRowsByColumn(row1, row2, column.intValue());
        if (result != 0)
          return ascending ? result : -result;
      }
    return 0;
  }

  public void  reallocateIndexes()
  {
    int rowCount = model.getRowCount();

    // Set up a new array of indexes with the right number of elements
    // for the new data model.
    indexes = new int[rowCount];

    // Initialise with the identity mapping.
    for(int row = 0; row < rowCount; row++)
      indexes[row] = row;
  }

  public void tableChanged(TableModelEvent e)
  {
	System.out.println("Sorter: tableChanged"); 
    reallocateIndexes();

    super.tableChanged(e);
  }

  public void checkModel()
  {
    if (indexes.length != model.getRowCount()) {
      System.err.println("Sorter not informed of a change in model.");
    }
  }

  public void  sort(Object sender)
  {
    checkModel();

    compares = 0;
    // n2sort();
    // qsort(0, indexes.length-1);
    shuttlesort((int[])indexes.clone(), indexes, 0, indexes.length);
    System.out.println("Compares: "+compares);
  }

  public void n2sort() {
    for(int i = 0; i < getRowCount(); i++) {
      for(int j = i+1; j < getRowCount(); j++) {
        if (compare(indexes[i], indexes[j]) == -1) {
          swap(i, j);
        }
      }
    }
  }

  // This is a home-grown implementation which we have not had time
  // to research - it may perform poorly in some circumstances. It
  // requires twice the space of an in-place algorithm and makes
  // NlogN assigments shuttling the values between the two
  // arrays. The number of compares appears to vary between N-1 and
  // NlogN depending on the initial order but the main reason for
  // using it here is that, unlike qsort, it is stable.
  public void shuttlesort(int from[], int to[], int low, int high) {
    if (high - low < 2) {
      return;
    }
    int middle = (low + high)/2;
    shuttlesort(to, from, low, middle);
    shuttlesort(to, from, middle, high);

    int p = low;
    int q = middle;

    /* This is an optional short-cut; at each recursive call,
    check to see if the elements in this subset are already
    ordered.  If so, no further comparisons are needed; the
    sub-array can just be copied.  The array must be copied rather
    than assigned otherwise sister calls in the recursion might
    get out of sinc.  When the number of elements is three they
    are partitioned so that the first set, [low, mid), has one
    element and and the second, [mid, high), has two. We skip the
    optimisation when the number of elements is three or less as
    the first compare in the normal merge will produce the same
    sequence of steps. This optimisation seems to be worthwhile
    for partially ordered lists but some analysis is needed to
    find out how the performance drops to Nlog(N) as the initial
    order diminishes - it may drop very quickly.  */

    if (high - low >= 4 && compare(from[middle-1], from[middle]) <= 0) {
      for (int i = low; i < high; i++) {
        to[i] = from[i];
      }
      return;
    }

    // A normal merge. 

    for(int i = low; i < high; i++) {
      if (q >= high || (p < middle && compare(from[p], from[q]) <= 0)) {
        to[i] = from[p++];
      }
      else {
        to[i] = from[q++];
      }
    }
  }

  public void swap(int i, int j) {
    int tmp = indexes[i];
    indexes[i] = indexes[j];
    indexes[j] = tmp;
  }

  // The mapping only affects the contents of the data rows.
  // Pass all requests to these rows through the mapping array: "indexes".

  public Object getValueAt(int aRow, int aColumn)
  {
    checkModel();
    return model.getValueAt(indexes[aRow], aColumn);
  }

  public void setValueAt(Object aValue, int aRow, int aColumn)
  {
    checkModel();
    model.setValueAt(aValue, indexes[aRow], aColumn);
  }

  public void sortByColumn(int column) {
    sortByColumn(column, true);
  }

  public void sortByColumn(int column, boolean ascending) {
    this.ascending = ascending;
    sortingColumns.removeAllElements();
    sortingColumns.addElement(new Integer(column));
    sort(this);
    super.tableChanged(new TableModelEvent(this)); 
  }

  // There is no-where else to put this. 
  // Add a mouse listener to the Table to trigger a table sort 
  // when a column heading is clicked in the JTable. 
  public void addMouseListenerToHeaderInTable(JTable table) { 
    final TableSorter sorter = this; 
    final JTable tableView = table; 
    tableView.setColumnSelectionAllowed(false); 
    MouseAdapter listMouseListener = new MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        TableColumnModel columnModel = tableView.getColumnModel();
        int viewColumn = columnModel.getColumnIndexAtX(e.getX()); 
        int column = tableView.convertColumnIndexToModel(viewColumn); 
        if(e.getClickCount() == 1 && column != -1) {
          System.out.println("Sorting ..."); 
          int shiftPressed = e.getModifiers()&InputEvent.SHIFT_MASK; 
          boolean ascending = (shiftPressed == 0); 
          sorter.sortByColumn(column, ascending); 
        }
       }
     };
    JTableHeader th = tableView.getTableHeader(); 
    th.addMouseListener(listMouseListener); 
  }
}

TableModel tableModel = //Implementação do TableModel
TableSorter  tableSorter = new TableSorter (myTableModel);
JTable table = new JTable (tableSorter);
tableSorter.addMouseListenerToHeaderInTable (table);