Deleting items from JList

From:

CBO <christopher_board@yahoo.co.uk>

Newsgroups:

comp.lang.java.help

Date:

Tue, 8 Jul 2008 02:35:53 -0700 (PDT)

Message-ID:

<7d8d7926-0d2c-4efd-81a3-efff79855519@k37g2000hsf.googlegroups.com>

Hi all,

I am currently developing a java application that uses JLists and when
the user has has pressed the delete button it will then remove the
selected item or the selected items from the JList and write what's
left into a file.

This is working absolutely fine except for the last item inside the
JList. There is one remaining item inside the JList and I want to
delete it. When i select the item and press the delete button it
removes the item from the JList and then the program falls over. The
error is:

Exception occurred during event dispatching:
java.util.NoSuchElementException
    at java.util.StringTokenizer.nextToken(Unknown Source)
    at
remoteshutdown.ExceptionsList.btnDelete_actionPerformed(ExceptionsList.java:
233)
    at
remoteshutdown.ExceptionsList_btnDelete_actionAdapter.actionPerformed(ExceptionsList.java:
279)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown
Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown
Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.Dialog$1.run(Unknown Source)
    at java.awt.Dialog$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.awt.Dialog.show(Unknown Source)
    at java.awt.Component.show(Unknown Source)
    at java.awt.Component.setVisible(Unknown Source)
    at java.awt.Window.setVisible(Unknown Source)
    at java.awt.Dialog.setVisible(Unknown Source)
    at
remoteshutdown.mainScreen.jMenuOptionsExceptions_actionPerformed(mainScreen.java:
979)
    at remoteshutdown.mainScreen
$mainScreen_jMenuOptionsExceptions_ActionAdapter.actionPerformed(mainScreen.java:
1145)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.AbstractButton.doClick(Unknown Source)
    at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
    at javax.swing.plaf.basic.BasicMenuItemUI
$Handler.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown
Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown
Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

It does not go further than removing the Item from the JList and
doesn't write the file. Just stops the program at that point. Below is
the code that I am using:

public void btnDelete_actionPerformed(ActionEvent e) {
        this.lstComputerExceptions.getModel();
        if (lstComputerExceptions.getSelectedIndices().length > 0) {
            int[] tmp = this.lstComputerExceptions.getSelectedIndices();
            int[] selectedIndicies =
lstComputerExceptions.getSelectedIndices();
            for (int i = tmp.length - 1; i >= 0; i--) {
                selectedIndicies = lstComputerExceptions.getSelectedIndices();
                model.removeElementAt(selectedIndicies[i]);
            }

            String computerName = model.toString();
            StringTokenizer st = new StringTokenizer(computerName, "[]");

// if (computerName != null) {

            /*} else {*/
                String tokenizedString = st.nextToken();
                String newComputers = tokenizedString.replace(",", "\n");
                System.out.println(newComputers);
                try {
                    BufferedWriter out = new BufferedWriter(
                            new FileWriter(
                                    "C:\\Documents and Settings\\All Users\\Application Data\
\Remote Shutdown\\ExceptionsList.csv",
                                    false));
                    out.write(newComputers);
                    out.write("\n");
                    out.close();
                } catch (IOException ex) {
                    statusBar.setForeground(Color.red);
                    statusBar
                            .setText("Failed to modify file. Please ensure the file is not
open");
                    System.err.println("Unable to delete: " + ex.toString());
                }
            }
        }

Any help in this matter would be highly appreciated. Thank you