JList add/remove Item

Hi I have to pick an element from a JList to another, removing it from the first The method I've created inserts only one element, overwriting the l开发者_开发技巧ast one and doesn't remove the selected item from the first JList Here's the code:

First list

private javax.swing.JList listaRosa;

Populated by this method:

private void visualizzaRosaButtonvisualizzaRosa(java.awt.event.ActionEvent evt) {                                                    
    // TODO add your handling code here:
    visualizzaSquadraSelezionata();
    String fileSquadra;
    fileSquadra = squadraDaVisualizzare.getText();
    DefaultListModel listModel = new DefaultListModel();
    try {
        FileInputStream fstream = new FileInputStream("C:/Users/Franky/Documents/NetBeansProjects/JavaApplication5/src/javaapplication5/Rose/"+fileSquadra+"");
        // Get the object of DataInputStream
        DataInputStream in = new DataInputStream(fstream);
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String strLine;
        //Read File Line By Line
        while ((strLine = br.readLine()) != null)   {
            listModel.addElement(strLine);
            System.out.println(strLine);
        }
        listaRosa.setModel(listModel);
        //Close the input stream
        in.close();
    } catch (Exception e) {
    }

The second list, where I want to insert items removing from the first:

private javax.swing.JList listaTitolari

Here's the NOT working code:

private void aggiungiTitolareButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                       
    // TODO add your handling code here:
    DefaultListModel listModel = new DefaultListModel();
    String daInserire;
    listModel.addElement(listaRosa.getSelectedValue());
    listModel.removeElement(listaRosa.getSelectedValue());
    listaTitolari.setModel(listModel);
} 

Thanks

The problem is

listModel.addElement(listaRosa.getSelectedValue());
listModel.removeElement(listaRosa.getSelectedValue());

you may be adding an element and immediatly removing it since both add and remove operations are on the same listModel.

Try

private void aggiungiTitolareButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                       

    DefaultListModel lm2 = (DefaultListModel) listaTitolari.getModel();
    DefaultListModel lm1  = (DefaultListModel) listaRosa.getModel();
    if(lm2 == null)
    {
        lm2 = new DefaultListModel();
        listaTitolari.setModel(lm2);
    }
    lm2.addElement(listaTitolari.getSelectedValue());
    lm1.removeElement(listaTitolari.getSelectedValue());        
} 

The best and easiest way to clear a JLIST is:

myJlist.setListData(new String[0]);