Which listener should be used for JTextArea

Question

Hi,
I need to add a listener for JTextArea particualy when
the text in the jtextarea is changed. I don't think
mouse listener is enough, since the user can use tab to
get to the jtextarea and edit the text. In this case,
which listener should I use. Sample code would be
helpful.
In addition, I have a problem with the jtextarea that
when user uses tab to go to different gui components,
such as jtextfield, jcombobox, jtextarea, jlist, etc, the
tab stays in the jtextarea and keeps appending to it. It does
not go to next component, such as jlist. How can I make it
work?
Thanks in advance,
Pin

Answer 1

It doesn't work. Are you using 1.4 or 1.3? I am using
1.4.
In the 1.4 API, it says that isManagingFocus is
"Deprecated".
Here is what I have:
JTextArea descrptArea = new JTextArea() {
public boolean isManagingFocus() {
return false;
descrptArea.setRows(3);
descrptArea.setLineWrap(true);
descrptArea.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
// DO SOMETHING
I found the following code which says it will do it.
However, I got the exeception:
java.lang.ClassCastException:
n: javax.swing.KeyStroke
at java.util.TreeMap.compare(TreeMap.java:1081)
at java.util.TreeMap.put(TreeMap.java:459)
at java.util.TreeSet.add(TreeSet.java:205)
Set forwardTraversalKeys = new TreeSet();
forwardTraversalKeys.add(KeyStroke.getKeyStroke('\t'));
forwardTraversalKeys.add(KeyStroke.getKeyStroke(KeyEven
.VK_TAB,
InputEvent.CTRL_MASK));
textArea.setFocusTraversalKeys
(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
forwardTraversalKeys);
Set backwardTraversalKeys = new TreeSet();
backwardTraversalKeys.add(KeyStroke.getKeyStroke(KeyEve
t.VK_TAB,
InputEvent.SHIFT_MASK));
backwardTraversalKeys.add(KeyStroke.getKeyStroke(KeyEve
t.VK_TAB,
InputEvent.SHIFT_MASK |InputEvent.CTRL_MASK));
textArea.setFocusTraversalKeys(
KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS,
backwardTraversalKeys);
Any idea???
PinI'm not using 1.4 but the class cast exceptions look like they come from : Set forwardTraversalKeys=new TreeSet() etc
try : TreeSet forwardTraversalKeys=new TreeSet()
you cant cast from a Set to a TreeSet because a TreeSet is a Set but a Set is NOT a TreeSet.
hope this helps.