JList add remove Item

Question

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 last 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

User · Accepted Answer

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

User · Answer

The best and easiest way to clear a JLIST is   myJlist setListData new String 0

[java] JList add/remove Item

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