如何让 JTable 上的 MouseListener 工作

Question

I'm trying to get a JTable working with a MouseListener . The code right now is a sample program for a JTable with Icons. What I want is, that if you double click on a row, a dialog should open with informations from the whole row or just the index-number from the row. But my problem is that the command: table.addMouseListener(this); is not working, maybe is it because of the constructor?

I tried to use a new object inside the main method and create then the MousListener.

 public class TableIcon extends JPanel
 {
   public TableIcon()
   {
       Icon aboutIcon = new ImageIcon("Mypath");
       Icon addIcon = new ImageIcon("Mypath");
       Icon copyIcon = new ImageIcon("Mypath");

       String[] columnNames = {"Picture", "Description"};
       Object[][] data =
       {
           {aboutIcon, "Pic1"},
           {addIcon, "Pic2"},
           {copyIcon, "Pic3"},
       };

       DefaultTableModel model = new DefaultTableModel(data,columnNames)
       {
           public Class getColumnClass(int column)
           {
               return getValueAt(0, column).getClass();
           }

           public boolean isCellEditable(int row, int column)
           {
               return false;
           }

       };
       JTable table = new JTable( model );
       table.setPreferredScrollableViewportSize
           (table.getPreferredSize());
 // ################ MyError #########
       table.addMouseListener(this); // Error
 // ##################################
       JScrollPane scrollPane = new JScrollPane( table );
       add( scrollPane );  
   }

   private static void createAndShowGUI()
   {
       TableIcon test = new TableIcon();

       JFrame frame = new JFrame("Table Icon");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.add(test);
       frame.setLocationByPlatform( true );
       frame.pack();
       frame.setVisible( true );
   }

   public static void main(String[] args)
   {
       EventQueue.invokeLater(new Runnable()
       {
           public void run()
           {
               createAndShowGUI();
           }
       });
   }
   public void mouseClicked(MouseEvent e)
   {
       System.out.println("clicked");
   }
}

In this code I expect a print with"clicked" but all I get is this error My Error TableIcon cannot be cast to java.awt.event.MouseListener

Answer 1

Try using Adapter class:

table.addMouseListener(new MouseAdapter() {
    public void mouseClicked(MouseEvent e) {
      if (e.getClickCount() == 2) {
        //Code for handling the double click event
      }
    }
});

Answer 2

You refer to this which is class TableIcon and it does not implement interface MouseListener , but method addMouseListener() expects it.

public void addMouseListener(MouseListener l)

If you want to go with approach of TableIcon class acting as event handler as well, then add implementation for the MouseListener interface.

public class TableIcon extends JPanel implements MouseListener {

 ...

 public void mouseClicked(MouseEvent e) {
    // code for handling of the click event
 }

 public void mouseEntered(MouseEvent e) {
 }

 public void mouseExited(MouseEvent e) {
 }

 public void mousePressed(MouseEvent e) {
 }

 public void mouseReleased(MouseEvent e) {
 }

}