append getSelectedValues?

[Patty Kingsmill]

I have the following code:

middlePanel = new JPanel();
     middlePanel.setLayout(new BoxLayout(middlePanel, BoxLayout.X_AXIS));
     catalogInfo = new JLabel("DTTM Catalog Items", JLabel.CENTER);
     middlePanel.add(catalogInfo);
    
   catalogItems = new JList(catalog.items);
   catalogItems.setVisibleRowCount(15);
   catalogItems.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
 
    middlePanel.add(new JScrollPane(catalogItems));
 
    select = new JButton("Select >>>");
    middlePanel.add(select);
 
    select.addActionListener(
    new ActionListener()
     {
        public void actionPerformed(ActionEvent event)
        {
         custSelections.setListData(catalogItems.getSelectedValues());        
        }
     });
 
    custSelections = new JList();
    custSelections.setVisibleRowCount(15);
    custSelections.setFixedCellWidth(100);
    custSelections.setFixedCellHeight(15);
    custSelections.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
    middlePanel.add(new JScrollPane(custSelections));  
 
    add(middlePanel,"Center");
    
bottomPanel = new JPanel();
finish = new JButton("Finish and Save");
bottomPanel.add(finish);
 
finish.addActionListener(
new ActionListener()
{
  public void actionPerformed(ActionEvent event)
  {
   //build some code to calculate # of selections X price
   JOptionPane.showMessageDialog(null, "Thank you for your order.");
   
  }
});
 

Users are able to select an item from the catalogItems JList. I would like to be able to count the number of selections made. I was thinking I could use a SINGLE_INTERVAL_SELECTION mode and count the number of times the user hits the "Select" button and use that count to perform a calculation in the "Finish and Save" ActionEvent. But, I want to display each selection listed in custSelections - is it possible to append?

Alternatively, if I allow a MULTIPLE_INTERVAL_SELECTION, how do I count the number of items in the custSelections JList?

Your advice is appreciated.
Patty

[Chad Clites]

This may only be moderately helpful, bit IIRC, when allowing multiple selections, the selections are saved in an array/collection. Then they can be retrieved with either getSelectedIndices, or getSelectedValues. I did something similar with JFileChooser a long time ago, but the exact code escapes me at the moment.

That's about all I can recall of the process at the moment (and there is more to it). Maybe this will be enough to at least give you a push in the right direction.

[Patty Kingsmill]

Thanks, that gave me a start to search for a solution and I found it:

getMaxSelectionIndex()

Patty

[Brian Cole]

getMaxSelectionIndex() doesn't tell you how
many selections there are, just the index of
the highest selected item.

Clites showed you how to get a list of the
selected items and/or indices. If you only
want the count you can do

int numSelected = jlist.getSelectedIndices().length;