hi id like to know whats the best way to add text to a jtextarea from a swingworkerthread, ive created another class which a jbutton calls by Threadsclass().execute(); and t
Within doInBackground(), use publish(V... chunks) to send data to process(List<V> chunks).
There is an excellent example from the JavaDocs
class PrimeNumbersTask extends
SwingWorker<List<Integer>, Integer> {
PrimeNumbersTask(JTextArea textArea, int numbersToFind) {
//initialize
}
@Override
public List<Integer> doInBackground() {
List<Integer> numbers = new ArrayList<Integer>(25);
while (!enough && !isCancelled()) {
number = nextPrimeNumber();
numbers.add(number);
publish(number);
setProgress(100 * numbers.size() / numbersToFind);
}
return numbers;
}
@Override
protected void process(List<Integer> chunks) {
for (int number : chunks) {
textArea.append(number + "\n");
}
}
}
JTextArea textArea = new JTextArea();
final JProgressBar progressBar = new JProgressBar(0, 100);
PrimeNumbersTask task = new PrimeNumbersTask(textArea, N);
task.addPropertyChangeListener(
new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
if ("progress".equals(evt.getPropertyName())) {
progressBar.setValue((Integer)evt.getNewValue());
}
}
});
task.execute();
System.out.println(task.get()); //prints all prime numbers we have got
Take a look at publish and process
The underlying intention is that you need to update the UI from only within the Event Dispatching Thread, by passing the data you want to updated to the UI via the publish
method, SwingWorker
will call process
for you within the context of the EDT