Essential problem with JTable Selections?

Question

As far as I noticed a JTable actually consists of multiple Lists.
For example; If I want to navigate horizontal and vertical (diagnal) from one cell to another I have to use two ListSelectionListeners.
One ListSelectionListener to determine row-selection changes and the second ListSelectionListener to determine column-selection changes.
table.getSelectionModel().addListSelectionListener(listener);
table.getColumnModel().getSelectionModel().addListSelectionListener(listener);Due to this way the valueChanged(ListSelectionEvent e) method defined by the ListSelectionListener interface is called two times when navigating in two directions and called once when navigating in one dimension.
Can this problem easily be solved or is this an idea for improvement?
P.S. I don't need the solving of this issue to help me progress with my current dev. It's just something that cracks my mind at four o'clock in the night.

Answer 1

You're completly right. I did not formulate the question good enough (ahh well.. my first post). What I meant was the detection of selection events, by a mouse click for example.
The JTable.changeSelection(row, column, toggle, extend) is used to programmatically change the selection itself. In matter of fact, I believe the mouse and/or keyboard actions even use this method to peform their tasks when clicking on a cell.
In my case, the row and column index of the cell being clicked have to be passed when a user clicks it in the Jtable.
I've made a JFrame program that shows an image when a cell is clicked. When the cell that is being clicked is in the same row or in the the same column as the previous selected cell, the picture is loaded once. When the newly clicked cell is in a different row and in a different column, the picture is loaded twice.
I've made an executable. I would like to post it, but I don't know whether that is common in this community.
Code in DistanceFinder which extends JFrame:
MySelectionListener listener = new MySelectionListener(cityTable, imageLabel);
        cityTable.getSelectionModel().addListSelectionListener(listener);
        cityTable.getColumnModel().getSelectionModel()
            .addListSelectionListener(listener);
MySelectionListener:
package gui;
import gui.MyLabel;
import java.awt.Toolkit;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
* @author Iwan
public class MySelectionListener implements ListSelectionListener {
     private JTable jtable;
     private MyLabel imageLabel;
     public MySelectionListener(JTable jtable, MyLabel imageLabel) {
          // TODO Auto-generated constructor stub
          this.jtable = jtable;
          this.imageLabel = imageLabel;
     /* (non-Javadoc)
      * @see javax.swing.event.ListSelectionListener#valueChanged(javax.swing.event.ListSelectionEvent)
     @Override
     public void valueChanged(ListSelectionEvent e) {
          // If cell selection is enabled, both row and column change events are fired
        if ((e.getSource() == jtable.getSelectionModel() || e.getSource() == jtable.getColumnModel().getSelectionModel())
                  && !e.getValueIsAdjusting()
                  && jtable.getSelectedColumn() != jtable.getSelectedRow()
                  && jtable.getSelectedColumn() != 0
                  && jtable.getSelectedRow() != 0 ){
             imageLabel.setImage(getSelectedCell(jtable));
     private int[] getSelectedCell(JTable jtable){
          int[] selectedCell = {jtable.getSelectedColumn(), jtable.getSelectedRow()};
          return selectedCell;
     private void showInfoBox(JTable jtable, ListSelectionEvent e){
          JOptionPane.showMessageDialog(null, "Row changed to: " + jtable.getSelectedRow()
                    + "\n Column changed to: " + jtable.getSelectedColumn()
                    + "\nFirst: " + e.getFirstIndex()
                    + "\nLast: " + e.getLastIndex());
}So the question remains:
The valueChanged(ListSelectionEvent e) method defined by the ListSelectionListener interface is called two times when navigating in two directions and called once when navigating in one dimension.
Can this problem easily be solved or is this an idea for improvement?