Removing rows and inserting new rows with new data in JTAble!!! (Plz. help)

Question

I have a problem, The scenario is that when I click any folder that si in my JTable's first row, the table is update by removing all the rows and showing only the contents of my selected folder. Right now it's not removing the rows and instead throwing exceptions. The code is attached. The methods to look are upDateTabel(...) and clearTableData(....), after clearing all my rows then I proceed on adding my data to the Jtable and inserting rows but it's not being done. May be I have a problem in my DefaultTableModel class. Please see the code below what I am doing wrong and how should I do it. Any help is appreciated.
Thanks
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
import javax.swing.border.*;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;
public class SimpleTable extends JPanel{
     /** Formats the date */
     protected SimpleDateFormat           formatter;
/** variable to hold the date and time in a raw form for the directory*/
protected long                          dateDirectory;
/** holds the readable form converted date for the directories*/
protected String                     dirDate;
/** holds the readable form converted date for the files*/
protected String                     fileDate;
/** variable to hold the date and time in a raw form for the file*/
protected long                          dateFile;
/** holds the length of the file in bytes */
protected long                         totalLen;
/** convert the length to the wrapper class */
protected Long                         longe;
/** Vector to hold the sub directories */
protected Vector                     subDir;
/** holds the name of the selected directory */
protected String                    dirNameHold;
/** converting vector to an Array and store the values in this */
protected File                     directoryArray[];
/** hashtable to store the key-value pair */
protected static Hashtable hashTable = new Hashtable();
/** refer to the TableModel that is the default*/
protected MyTableModel               tableModel;
/** stores the path of the selected file */
protected static String               fullPath;
/** stores the currently selected file */
protected static File selectedFilename;
/** stores the extension of the selected file */
protected static String           extension;
protected int COLUMN_COUNT = 4;
     protected Vector data = new Vector( 0, 1 );
     protected final JTable table;
/** holds the names of the columns */
protected final String columnNames[] = {"Name", "Size", "Type", "Modified"};
public SimpleTable(File directoryArray[])
          this.setLayout(new BorderLayout());
          this.setBorder( BorderFactory.createEmptyBorder( 0, 0, 0, 0 ) );
          (SimpleTable.hashTable).clear();
          formatter = new SimpleDateFormat("mm/dd/yyyy hh:mm aaa");
          for(int k = 0; k < directoryArray.length; k++)
               if(directoryArray[k].isDirectory())
                    dateDirectory = directoryArray[k].lastModified();
                    dirDate = formatter.format(new java.util.Date(dateDirectory));
                    data.addElement( new MyObj( directoryArray[k].getName(), "", "File Folder", "" + dirDate ) );
                    (SimpleTable.hashTable).put(directoryArray[k].getName(), directoryArray[k]);                    
               else if(directoryArray[k].isFile())
                    dateDirectory = directoryArray[k].lastModified();
                    fileDate = formatter.format(new java.util.Date(dateDirectory));
                    totalLen = directoryArray[k].length();
                    longe = new Long(totalLen);
                    data.addElement( new MyObj( directoryArray[k].getName(), longe + " Bytes", "", "" + fileDate ) );
                    (SimpleTable.hashTable).put(directoryArray[k].getName(), directoryArray[k]);
tableModel = new MyTableModel();
          table = new JTable( tableModel );
          table.getTableHeader().setReorderingAllowed(false);
          table.setRowSelectionAllowed(false);
          table.setBorder( BorderFactory.createEmptyBorder( 0, 0, 0, 0 ) );
          table.setShowHorizontalLines(false);
          table.setShowVerticalLines(false);
          table.addMouseListener(new MouseAdapter()
public void mouseReleased(MouseEvent e)
     Object eventTarget = e.getSource();
                    if( eventTarget == table )
                         upDateTable(table);
                         table.tableChanged( new javax.swing.event.TableModelEvent(tableModel) ) ;
          DefaultTableCellRenderer D_headerRenderer = (DefaultTableCellRenderer ) table.getTableHeader().getDefaultRenderer();
          table.getColumnModel().getColumn(0).setHeaderRenderer(D_headerRenderer );
          ((DefaultTableCellRenderer)D_headerRenderer).setToolTipText("File and Folder in the Current Folder");
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Add the scroll pane to this window.
this.add(scrollPane, BorderLayout.CENTER);
* Searches the Hashtable and returns the path of the folder or the value.
public File findPath(String value)
     return (File)((SimpleTable.hashTable).get(value));
* This clears the previous data in the JTable
public void clearTableData(JTable table)
     for(int row = 0; row < table.getRowCount() ; row++)
               //for (int col = 0; col < table.getColumnCount() ; col++)
                    tableModel.deleteSelections( row );
          tableModel.fireTableStructureChanged();
          tableModel.fireTableRowsDeleted(0,table.getRowCount());
          //table.getModel().fireTableChanged(new TableModelEvent(table.getModel()));
private void upDateTable(JTable table)
if((table.getSelectedColumn() == 0) && ((table.getColumnName(0)).equals(columnNames[0])))
     dirNameHold =(String) table.getValueAt(table.getSelectedRow(),table.getSelectedColumn());
               File argument = findPath(dirNameHold);
               if(argument.isFile())
                    CMRDialog.fileNameTextField.setText(argument.getName());
                    try
                         fullPath = argument.getCanonicalPath();                          
                         selectedFilename = argument.getCanonicalFile();                          
CMRDialog.filtersComboBox.removeAllItems();
                         extension = fullPath.substring(fullPath.lastIndexOf('.'));
                         CMRDialog.filtersComboBox.addItem("( " + extension + " )" + " File");
                    catch(IOException e)
                         System.out.println("THE ERROR IS " + e);
                    return;
               else if(argument.isDirectory())
                    String path = argument.getName();
                         //find the system dependent file separator
                         //String fileSeparator = System.getProperty("file.separator");
                    CMRDialog.driveComboBox.addItem(" " + path);
          subDir = Search.subDirs(argument);
          /**TBD:- needs a method to convert the vector to an array and return the array */
          directoryArray = new File[subDir.size()];
               int indexCount = 0;
               /** TBD:- This is inefficient way of converting a vector to an array */               
               Iterator e = subDir.iterator();               
               while( e.hasNext() )
                    directoryArray[indexCount] = (File)e.next();
                    indexCount++;
          /** now calls this method and clears the previous data */
          clearTableData(table);     
               (SimpleTable.hashTable).clear();
               //data = new Object[this.getRowTotal(directoryArray)][this.getColumnTotal()];
               formatter = new SimpleDateFormat("mm/dd/yyyy hh:mm aaa");
               for(int k = 0; k < directoryArray.length; k++)
                    if(directoryArray[k].isDirectory())
                         dateDirectory = directoryArray[k].lastModified();
                         dirDate = formatter.format(new java.util.Date(dateDirectory));
                         data.addElement( new MyObj( directoryArray[k].getName(), "", "File Folder", "" + dirDate ) );
                         (SimpleTable.hashTable).put(directoryArray[k].getName(), directoryArray[k]);                    
                    else if(directoryArray[k].isFile())
                         dateDirectory = directoryArray[k].lastModified();
                         fileDate = formatter.format(new java.util.Date(dateDirectory));
                         totalLen = directoryArray[k].length();
                         longe = new Long(totalLen);
                         data.addElement( new MyObj( directoryArray[k].getName(), longe + " Bytes", "", "" + fileDate ) );
                         (SimpleTable.hashTable).put(directoryArray[k].getName(), directoryArray[k]);
          // tableModel.fireTableDataChanged();          
          // tableModel.fireTableRowsInserted(0,1);
          table.revalidate();
          table.validate();               
class MyTableModel extends DefaultTableModel
          int totalRows;
          int totalCols;
          public MyTableModel()
               super();
               setColumnIdentifiers (columnNames);
               this.totalRows = data.size();
               this.totalCols = columnNames.length;
          // this will return the row count of your table
          public int getRowCount()
               return totalRows;
          // this return the column count of your table
          public int getColumnCount()
               return totalCols;
          // this return the data for each cell in your table
          public Object getValueAt(int row, int col)
               MyObj obj = (MyObj)data.elementAt( row );
               if( obj != null )
                    if( col == 0 ) return( obj.first );
                    else if( col == 1 ) return( obj.last );
                    else if( col == 2 ) return( obj.third );
                    else if( col == 3 ) return( obj.fourth );
                    else return( "" );
               return "";
          // if you want your table to be editable then return true
          public boolean isCellEditable(int row, int col)
               return false;
          // if your table is editable edit the data vector here and
          // call table.tableChanged(...)
          public void setValueAt(Object value, int row, int col)
          protected void deleteSelections (int rows)
               try
                    removeRow(rows);
               catch(ArrayIndexOutOfBoundsException e)
                    System.out.println("The error in the row index " + rows);
               fireTableDataChanged() ;
class MyObj
          String first;
          String last;
          String third;
          String fourth;
          public MyObj( String f, String l, String t, String fo )
               this.first = f;
               this.last = l;
               this.third = t;
               this.fourth = fo;
#####################################

Answer 1

The following code works fine but it doesn't show me the new updated date in my JTable. I tried to print the values that I am getting and it does give the values on the prompt but doesn't show me on the JTable only first two are shown and the rest of the table is filled with the same values. I don't know what's going on and am tired of this TableModel thing so pla. take a time to give me some suggestions. Thanks
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
import javax.swing.border.*;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;
public class SimpleTable extends JPanel {
     /** Formats the date */
     protected SimpleDateFormat           formatter;
/** two-dimensional array to hold the information for each column */
protected Object                     data[][];
/** variable to hold the date and time in a raw form for the directory*/
protected long                          dateDirectory;
/** holds the readable form converted date for the directories*/
protected String                     dirDate;
/** holds the readable form converted date for the files*/
protected String                     fileDate;
/** variable to hold the date and time in a raw form for the file*/
protected long                          dateFile;
/** holds the length of the file in bytes */
protected long                         totalLen;
/** convert the length to the wrapper class */
protected Long                         longe;
/** Vector to hold the sub directories */
protected Vector                     subDir;
/** holds the name of the selected directory */
protected String                    dirNameHold;
/** converting vector to an Array and store the values in this */
protected File                     directoryArray[];
/** hashtable to store the key-value pair */
protected static Hashtable hashTable = new Hashtable();
/** refer to the TableModel that is the default*/
protected DefaultTableModel      model;
/** stores the path of the selected file */
protected static String               fullPath;
/** stores the currently selected file */
protected static File selectedFilename;
/** stores the extension of the selected file */
protected static String           extension;
protected Vector                     m = new Vector(0,1);
/** holds the names of the columns */
protected final String columnNames[] = {"Name", "Size", "Type", "Modified"};
public SimpleTable(File directoryArray[])
          this.setLayout(new BorderLayout());
          this.setBorder( BorderFactory.createEmptyBorder( 0, 0, 0, 0 ) );
          (SimpleTable.hashTable).clear();
          data = new Object[this.getRowTotal(directoryArray)][this.getColumnTotal()];
          formatter = new SimpleDateFormat("mm/dd/yyyy hh:mm aaa");
          for(int k = 0; k < directoryArray.length; k++)
               if(directoryArray[k].isDirectory())
                    data[k][0] = directoryArray[k].getName();
                    data[k][2] = "File Folder";
                    dateDirectory = directoryArray[k].lastModified();
                    dirDate = formatter.format(new java.util.Date(dateDirectory));
                    data[k][3] = dirDate;
                    (SimpleTable.hashTable).put(directoryArray[k].getName(), directoryArray[k]);                    
               else if(directoryArray[k].isFile())
                    data[k][0] = directoryArray[k].getName();
                    totalLen = directoryArray[k].length();
                    longe = new Long(totalLen);
                    data[k][1] = longe + " Bytes";
                    dateFile = directoryArray[k].lastModified();
                    fileDate = formatter.format(new java.util.Date(dateFile));
                    data[k][3] = fileDate;
                    (SimpleTable.hashTable).put(directoryArray[k].getName(), directoryArray[k]);
model = new DefaultTableModel();
model.addTableModelListener( new TableModelListener(){
          public void tableChanged( javax.swing.event.TableModelEvent e )
               System.out.println("************ I am inside the table changed method ********" );
          final JTable table = new JTable(model);
          table.getTableHeader().setReorderingAllowed(false);
          table.setRowSelectionAllowed(false);
          table.setBorder( BorderFactory.createEmptyBorder( 0, 0, 0, 0 ) );
          table.setShowHorizontalLines(false);
          table.setShowVerticalLines(false);
          table.addMouseListener(new MouseAdapter()
/* public void mousePressed(MouseEvent e)
//System.out.println("The clicked component is " + table.rowAtPoint(e.getPoint()) + "AND the number of clicks is " + e.getClickCount());
/* if(e.getClickCount() >= 2 &&
(table.getSelectedColumn() == 0) &&
((table.getColumnName(0)).equals(columnNames[0])))
     //System.out.println("The clicked component is " + table.rowAtPoint(e.getPoint()) + "AND the number of clicks is " + e.getClickCount());
     upDateTable(table);
public void mouseReleased(MouseEvent e)
//System.out.println("The clicked component is " + table.rowAtPoint(e.getPoint()) + "AND the number of clicks is " + e.getClickCount());
/* if(e.getClickCount() >= 2 &&
(table.getSelectedColumn() == 0) &&
((table.getColumnName(0)).equals(columnNames[0]))) */
     //System.out.println("The clicked component is " + table.rowAtPoint(e.getPoint()) + "AND the number of clicks is " + e.getClickCount());
     upDateTable(table);
          /** set the columns */
          for(int c = 0; c < columnNames.length; c++)
               model.addColumn(columnNames[c]);
          /** set the rows */
          for(int r = 0; r < data.length; r++)
               model.addRow(data[r]);
          DefaultTableCellRenderer D_headerRenderer = (DefaultTableCellRenderer ) table.getTableHeader().getDefaultRenderer();
          table.getColumnModel().getColumn(0).setHeaderRenderer(D_headerRenderer );
          ((DefaultTableCellRenderer)D_headerRenderer).setToolTipText("File and Folder in the Current Folder");
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Add the scroll pane to this window.
this.add(scrollPane, BorderLayout.CENTER);
* Returns the number of columns
public int getColumnTotal()
     return columnNames.length;
* Returns the number of rows
public int getRowTotal(Object directoryArray[])
     return directoryArray.length;
private void upDateTable(JTable table)
if((table.getSelectedColumn() == 0) && ((table.getColumnName(0)).equals(columnNames[0])))
     dirNameHold =(String) table.getValueAt(table.getSelectedRow(),table.getSelectedColumn());
               File argument = findPath(dirNameHold);
               if(argument.isFile())
                    CMRDialog.fileNameTextField.setText(argument.getName());
                    try
                         fullPath = argument.getCanonicalPath();                          
                         selectedFilename = argument.getCanonicalFile();                          
CMRDialog.filtersComboBox.removeAllItems();
                         extension = fullPath.substring(fullPath.lastIndexOf('.'));
                         CMRDialog.filtersComboBox.addItem("( " + extension + " )" + " File");
                    catch(IOException e)
                         System.out.println("THE ERROR IS " + e);
                    return;
               else if(argument.isDirectory())
                    String path = argument.getName();
                         //find the system dependent file separator
                         //String fileSeparator = System.getProperty("file.separator");
                    CMRDialog.driveComboBox.addItem(" " + path);
          subDir = Search.subDirs(argument);
          /**TBD:- needs a method to convert the vector to an array and return the array */
          directoryArray = new File[subDir.size()];
               int indexCount = 0;
               /** TBD:- This is inefficient way of converting a vector to an array */               
               Iterator e = subDir.iterator();               
               while( e.hasNext() )
                    directoryArray[indexCount] = (File)e.next();
                    indexCount++;
          /** now calls this method and clears the previous data */
          clearTableData(table);     
               (SimpleTable.hashTable).clear();
               data = new Object[this.getRowTotal(directoryArray)][this.getColumnTotal()];
               formatter = new SimpleDateFormat("mm/dd/yyyy hh:mm aaa");
               m.clear();
               data = null;
               data = new Object[this.getRowTotal(directoryArray)][this.getColumnTotal()];
               for(int k = 0; k < directoryArray.length; k++)
                    if(directoryArray[k].isDirectory())
                    System.out.println("Inside the if part");
                         data[k][0] = directoryArray[k].getName();
                         table.setValueAt(directoryArray[k].getName(),k,0);
                         //model.fireTableCellUpdated(k,0);
                         data[k][2] = "File Folder";
                         table.setValueAt("File Folder",k,2);
                         //model.fireTableCellUpdated(k,2);
                         dateDirectory = directoryArray[k].lastModified();
                         dirDate = formatter.format(new java.util.Date(dateDirectory));
                         data[k][3] = dirDate;
                         table.setValueAt(dirDate,k,3);
                         //model.fireTableCellUpdated(k,3);
                         (SimpleTable.hashTable).put(directoryArray[k].getName(), directoryArray[k]);
                         m.add(data);
                         model.addRow(m);
                         model.fireTableDataChanged();                              
                    else if(directoryArray[k].isFile())
               System.out.println("******* Inside the else part *******");
                         data[k][0] = directoryArray[k].getName();
               System.out.println("The Name is == " + data[k][0]);
                         table.setValueAt(directoryArray[k].getName(),k,0);
               System.out.println("The table cell value of the name is == " + table.getValueAt(k,0));
                         //model.fireTableCellUpdated(k,0);
                         totalLen = directoryArray[k].length();
                         longe = new Long(totalLen);
                         data[k][1] = longe + " Bytes";
               System.out.println("The length == " + data[k][1]);
                         table.setValueAt(longe + " Bytes",k,1);
               System.out.println("The table cell value of the length is == " + table.getValueAt(k,1));
                         //model.fireTableCellUpdated(k,0);
                         dateFile = directoryArray[k].lastModified();
                         fileDate = formatter.format(new java.util.Date(dateFile));
                         data[k][3] = fileDate;
               System.out.println("The modified date == " + data[k][3]);
                         table.setValueAt(fileDate,k,3);
               System.out.println("The table cell value of the name is == " + table.getValueAt(k,3));
                         //model.fireTableCellUpdated(k,0);
                         (SimpleTable.hashTable).put(directoryArray[k].getName(), directoryArray[k]);                    }
                         m.add(data);
                         model.addRow(m);
                         model.fireTableDataChanged();     
          // model.fireTableDataChanged();          
          // model.fireTableRowsInserted(0,1);
          table.revalidate();
          table.validate();               
     else
* Searches the Hashtable and returns the path of the folder or the value.
public File findPath(String value)
     return (File)((SimpleTable.hashTable).get(value));
* This clears the previous data in the JTable
public void clearTableData(JTable table)
     for(int row = 0; row < table.getRowCount() ; row++)
               for (int col = 0; col < table.getColumnCount() ; col++)
                    table.setValueAt(null, row , col);
          model.fireTableStructureChanged();
###