java swingworker线程更新主GUI

Z时代
2024-01-10
分类：问答

您好，我想知道从swingworkerthread向jtextarea添加文本的最佳方法是什么，我创建了另一个类，Threadsclass（）。execute（）调用了jbutton。并且线程与此代码并行运行

public class Threadsclass extends SwingWorker<Object, Object> {
@Override
protected Object doInBackground() throws Exception {
    for(int x = 0; x< 10;x++)
        try {
            System.out.println("sleep number :"+ x);
        Thread.sleep(1000);
    } catch (InterruptedException ex) {
        Logger.getLogger(eftcespbillpaymentsThreads.class.getName()).log(Level.SEVERE, null, ex);
    }
    throw new UnsupportedOperationException("Not supported yet.");
}
}

现在id要做的是将x的值添加到主gui上的文本区域，任何想法都值得赞赏。

回答：

JavaDocs有一个很好的例子

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