Sorting the Rows in a JTable Component Based on a Column

Question

Hi Masters..would like to have your valuable help and suggestion..i am using jdk1.4.i have jtbale and would like to have one column data in sorted way...
just i am enclosing my code in tha i am using Collections.sort(data, new ColumnSorter(colIndex, ascending)); but that compare of that comparator is not at woring that data is not getting soretd.
here data is the jtable complete data.
Main java file:
package com.ibm.sort;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
public class SimpleTableDemo extends JPanel {
private boolean DEBUG = false;
     int colIndex;
          boolean ascending;
     DefaultTableModel model = new DefaultTableModel();
public SimpleTableDemo() {
super(new GridLayout(1,0));
String[] columnNames = {"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)}
final JTable table = new JTable(data, columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500, 80));
          table.setAutoCreateColumnsFromModel(false);
     JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
          sortAllRowsBy(model, 1, true);
     public void sortAllRowsBy(DefaultTableModel model, int colIndex, boolean ascending) {
               Vector data = model.getDataVector();
               System.out.println("SimpleTableDemo.sortAllRowsBy()11111");
               Collections.sort(data, new ColumnSorter(colIndex, ascending));
          //Collections.sort(data);
               //Arrays.sort(data, new ColumnSorter(colIndex, ascending));
               System.out.println("SimpleTableDemo.sortAllRowsBy()2222");
               model.fireTableStructureChanged();
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("SimpleTableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
SimpleTableDemo newContentPane = new SimpleTableDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
Second FIle which has sorting :
* Created on Jun 21, 2008
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
package com.ibm.sort;
import java.util.Comparator;
import java.util.Vector;
// This comparator is used to sort vectors of data
public class ColumnSorter implements Comparator {
     int colIndex;
     boolean ascending;
     ColumnSorter(int colIndex, boolean ascending) {
          System.out.println("ColumnSorter.ColumnSorter(---colIndex--:"+colIndex+" ,ascending: "+ascending);
          this.colIndex = colIndex;
          this.ascending = ascending;
          System.out.println("ColumnSorter.ColumnSorter()");
     public int compare(Object a, Object b) {
          System.out.println("compare-----:");
          Vector v1 = (Vector)a;
          Vector v2 = (Vector)b;
          Object o1 = v1.get(colIndex);
          Object o2 = v2.get(colIndex);
System.out.println("ColumnSorter.compare(): -o1- :"+o1+" ,o2: "+o2);
          // Treat empty strains like nulls
          if (o1 instanceof String && ((String)o1).length() == 0) {
               o1 = null;
          if (o2 instanceof String && ((String)o2).length() == 0) {
               o2 = null;
          // Sort nulls so they appear last, regardless
          // of sort order
          if (o1 == null && o2 == null) {
               return 0;
          } else if (o1 == null) {
               return 1;
          } else if (o2 == null) {
               return -1;
          } else if (o1 instanceof Comparable) {
               if (ascending) {
                    System.out.println("ascending-->ColumnSorter.compare()-((Comparable)o1).compareTo(o2): "+(((Comparable)o1).compareTo(o2)));
                    return ((Comparable)o1).compareTo(o2);
               } else {
                    System.out.println("Desending-->ColumnSorter.compare()-((Comparable)o1).compareTo(o2): "+(((Comparable)o1).compareTo(o2)));
                    return ((Comparable)o2).compareTo(o1);
          } else {
               if (ascending) {
                    System.out.println("ColumnSorter.compare()---o1.toString().compareTo(o2.toString())---: "+(o1.toString().compareTo(o2.toString())));
                    return o1.toString().compareTo(o2.toString());
               } else {
                    return o2.toString().compareTo(o1.toString());
Please help is deadly needed.
thanks in advance!!!

Answer 1

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