我想使用Swing工作线程来更新Swing中的GUI。任何帮助都将不胜感激。我需要使用线程仅更新1个字段的状态,即setText()。
我想使用Swing工作线程来更新Swing中的GUI。任何帮助都将不胜感激。我需要使用线程仅更新1个字段的状态,即setText()。
我刚在另一个论坛上回答了关于SwingWorker的类似问题:
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.SwingWorker;
import javax.swing.Timer;
public class Main extends JFrame
{
private JLabel label;
private Executor executor = Executors.newCachedThreadPool();
private Timer timer;
private int delay = 1000; // every 1 second
public Main()
{
super("Number Generator");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(300, 65);
label = new JLabel("0");
setLayout(new FlowLayout());
getContentPane().add(label, "Center");
prepareStartShedule();
setVisible(true);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
new Main();
}
});
}
private void prepareStartShedule()
{
timer = new Timer(delay, startCycle());
timer.start();
}
private Action startCycle()
{
return new AbstractAction()
{
@Override
public void actionPerformed(ActionEvent e)
{
executor.execute(new MyTask());
}
};
}
private class MyTask extends SwingWorker<Void, Integer>
{
@Override
protected Void doInBackground() throws Exception
{
doTasksInBackground();
return null;
}
private void doTasksInBackground()
{
publish(generateRandomNumber());
}
private int generateRandomNumber()
{
return (int) (Math.random() * 101);
}
@Override
protected void process(List<Integer> chunks)
{
for(Integer chunk : chunks) label.setText("" + chunk);
}
}
}
注:一个月前@trashgod帮助我理解如何处理SwingWorker(如果线程启动Executor,无法从Future<?>和SwingWorker获得ArrayIndexOutOfBoundsException),因此感谢他。
编辑:代码已经更正。感谢@Hovercraft Full Of Eels。