remove last item from JList

From:

CBO <christopher_board@yahoo.co.uk>

Newsgroups:

comp.lang.java.help

Date:

Tue, 8 Jul 2008 06:23:12 -0700 (PDT)

Message-ID:

<641845b6-4d8a-4da8-a90d-5aecec9a0519@59g2000hsb.googlegroups.com>

Hi all,

I am currently developing a java application that will read in a data
file and populate the information from the data file into a JList. The
user is able to select an item or multiple items from the JList and
then press the delete button which will then remove those items from
the JList and then rewrite the existing data into the data file.

This method works fine until there is only one remaining item left
inside the JList.

What is happening is when the user selects the last item inside the
JList and then presses the delete button this will remove the item
from the JList but will then come up with an error and not rewrite the
information to the file.

The error is below:

Exception occurred during event dispatching:
java.util.NoSuchElementException
    at java.util.StringTokenizer.nextToken(Unknown Source)
    at
remoteshutdown.ExceptionsList.btnDelete_actionPerformed(ExceptionsList.java:
228)
    at
remoteshutdown.ExceptionsList_btnDelete_actionAdapter.actionPerformed(ExceptionsList.java:
273)
    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)

The code that I am using is below:
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