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copied!<p>Based on ListDemo sample from SUN.</p> <p>If you enter some text in the textfield which isn't in the list and you hit highlight it gets added.</p> <p>If the text is in the list and you hit highlight the entry in the list gets temporarily highlighted blue.</p> <p>Note the solution here with the match field is just for demo. For more correct implementation consider the other ideas proposed and consider using <code>javax.swing.Timer</code></p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; public class ListDemo extends JPanel { private JList list; private DefaultListModel listModel; public String match = null; private static final String hireString = "Highlight"; private JTextField employeeName; public ListDemo() { super(new BorderLayout()); listModel = new DefaultListModel(); listModel.addElement("Test1"); listModel.addElement("Test2"); listModel.addElement("Test3"); list = new JList(listModel); list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); list.setSelectedIndex(0); list.setVisibleRowCount(5); list.setCellRenderer(new MyListCellRenderer()); JScrollPane listScrollPane = new JScrollPane(list); JButton hireButton = new JButton(hireString); HireListener hireListener = new HireListener(hireButton); hireButton.setActionCommand(hireString); hireButton.addActionListener(hireListener); hireButton.setEnabled(false); employeeName = new JTextField(10); employeeName.addActionListener(hireListener); employeeName.getDocument().addDocumentListener(hireListener); listModel.getElementAt(list.getSelectedIndex()).toString(); JPanel buttonPane = new JPanel(); buttonPane.setLayout(new BoxLayout(buttonPane, BoxLayout.LINE_AXIS)); buttonPane.add(Box.createHorizontalStrut(5)); buttonPane.add(employeeName); buttonPane.add(hireButton); buttonPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); add(listScrollPane, BorderLayout.CENTER); add(buttonPane, BorderLayout.PAGE_END); } class MyListCellRenderer extends JLabel implements ListCellRenderer { public MyListCellRenderer() { setOpaque(true); } public Component getListCellRendererComponent(JList paramlist, Object value, int index, boolean isSelected, boolean cellHasFocus) { setText(value.toString()); if (value.toString().equals(match)) { setBackground(Color.BLUE); SwingWorker worker = new SwingWorker() { @Override public Object doInBackground() { try { Thread.sleep(5000); } catch (InterruptedException e) { /*Who cares*/ } return null; } @Override public void done() { match = null; list.repaint(); } }; worker.execute(); } else setBackground(Color.RED); return this; } } class HireListener implements ActionListener, DocumentListener { private boolean alreadyEnabled = false; private JButton button; public HireListener(JButton button) { this.button = button; } public void actionPerformed(ActionEvent e) { String name = employeeName.getText(); if (listModel.contains(name)) { match = name; list.repaint(); employeeName.requestFocusInWindow(); employeeName.selectAll(); return; } if (name.equals("")) { Toolkit.getDefaultToolkit().beep(); employeeName.requestFocusInWindow(); employeeName.selectAll(); return; } int index = list.getSelectedIndex(); if (index == -1) index = 0; else index++; listModel.insertElementAt(employeeName.getText(), index); employeeName.requestFocusInWindow(); employeeName.setText(""); list.setSelectedIndex(index); list.ensureIndexIsVisible(index); } public void insertUpdate(DocumentEvent e) { enableButton(); } public void removeUpdate(DocumentEvent e) { handleEmptyTextField(e); } public void changedUpdate(DocumentEvent e) { if (!handleEmptyTextField(e)) enableButton(); } private void enableButton() { if (!alreadyEnabled) button.setEnabled(true); } private boolean handleEmptyTextField(DocumentEvent e) { if (e.getDocument().getLength() <= 0) { button.setEnabled(false); alreadyEnabled = false; return true; } return false; } } private static void createAndShowGUI() { JFrame frame = new JFrame("ListDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JComponent newContentPane = new ListDemo(); newContentPane.setOpaque(true); frame.setContentPane(newContentPane); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } } </code></pre>

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