Unable to delete a list entry at runtime

[Mansoor Khan]

I have a list which consists of names and a button to delete the selected name when clicked. The names in the list are read from a database. When I click on the button to delete the selected entry, I get an error like this on the terminal window and the entry is not deleted:

Error : java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 3


The code for the same is as below :

   
  if(event.getSource()==deleteButton)
 try{   dueDateInfo.setText(""); // due date,class etc are simply the textfields to display data
        classInfo.setText("");
        timeInfo.setText("");
        contact.setText("");
      
         nameList.remove(nameList.getSelectedIndex());      //nameList is the List containing names
      
        //String data=(nameList.getSelectedValue()).toString();
       //delete(data)
    }catch(Exception e){System.out.println("Error : "+e);}
 

The bug may be evident but I am not able to fix it. Kindly help me get over with this.

[Rob Camick]

Read the JList API and follow the link to the Swing tutorial on "How to Use Lists' for a working example that dynamically adds/removes items from a JList.

[Mansoor Khan]

I did that. Can you please help me find where I am wrong in my code?

[Darryl Burke]

Mansoor Khan wrote:I did that. Can you please help me find where I am wrong in my code?

Not without an SSCCE.

[Peter Taucher]

I'd recommend using the ListModel for adding / removing of items (like in the swing tutorials). Here's a working mini-example:

public class JListDemo extends JFrame
{
    final DefaultListModel lmItems;
    final JList liItems;
    final JTextField tfAddListItem;
    final JButton btAddListItem;
    final JButton btRemoveSelected;
    
    public JListDemo()
    {
        super( "FooBar" );
        
        lmItems = new DefaultListModel();
        liItems = new JList( lmItems );
        tfAddListItem = new JTextField( "Insert List Item" );
        btAddListItem = new JButton( new AbstractAction( "Add List Item" )
        {   
            @Override
            public void actionPerformed( ActionEvent e )
            {
                // Add new item to list (from textfield)
                lmItems.addElement( tfAddListItem.getText() );
            }
        });
        btRemoveSelected = new JButton( new AbstractAction( "Remove Selected" )
        {   
            @Override
            public void actionPerformed( ActionEvent e )
            {
                // Remove all selected items
                int[] indices = liItems.getSelectedIndices();
                for ( int i = indices.length - 1; i >= 0; i-- )
                {
                    lmItems.remove( indices[i] );
                }
                // Clear selection and repaint
                liItems.clearSelection();
                liItems.repaint();
            }
        });
        
        JPanel pnlButtons = new JPanel( new GridLayout( 0, 1 ) );
        pnlButtons.add( tfAddListItem );
        pnlButtons.add( btAddListItem );
        pnlButtons.add( btRemoveSelected );
        
        add( pnlButtons, BorderLayout.NORTH );
        add( new JScrollPane( liItems ), BorderLayout.CENTER );
        
        setDefaultCloseOperation( DISPOSE_ON_CLOSE );
        setSize( 400, 400 );
    }
    
    public static void main( String[] args )
    {
        SwingUtilities.invokeLater( new Runnable()
        {   
            @Override
            public void run()
            {
                new JListDemo().setVisible( true );
            }
        });
    }
}