因此，基本想法是使用SwingWorker 和Swing Timer 的组合。
这个想法是，如果Timer 在SwingWorker 之前触发是DONE，您执行一些其他工作流，否则您停止Timer，例如...
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingWorker;
import javax.swing.Timer;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JLabel label;
private JButton startButton;
boolean hasCompleted = false;
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
label = new JLabel("Waiting for you");
startButton = new JButton("Start");
add(label, gbc);
add(startButton, gbc);
startButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
startButton.setEnabled(false);
startWork();
}
});
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
protected void startWork() {
label.setText("Something wicked this way comes");
// You could build an isoloated workflow, which allowed you to pass
// three targets, the thing to be executed, the thing to be
// executed if time run over and the thing to be executed when
// the task completed (all via a single interface),
// but, you get the idea
Timer timer = new Timer(2000, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (hasCompleted) {
return;
}
label.setText("Wickedness is a bit slow today");
}
});
timer.setRepeats(false);
SomeLongRunningOperation worker = new SomeLongRunningOperation();
worker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
switch (worker.getState()) {
case DONE:
hasCompleted = true;
timer.stop();
label.setText("All is done");
startButton.setEnabled(true);
break;
}
}
});
worker.execute();
timer.start();
}
}
public class SomeLongRunningOperation extends SwingWorker<Void, Void> {
@Override
protected Void doInBackground() throws Exception {
Thread.sleep(5000);
return null;
}
}
}
玩转时间，看看你会得到什么不同的效果。
为什么要使用SwingWorker？因为它有自己的状态回调，所以更容易处理
正如我在 cmets 中所说，您可以将工作流程提炼成一个可重用的概念，例如...
public class TimedTask<V> {
public static interface Task<V> {
public V execute() throws Exception;
}
public static interface TimedTaskListener<V> extends EventListener {
public void taskIsTakingLongThenExepected(TimedTask task);
public void taskDidComplete(TimedTask task, V value);
}
private Task<V> task;
private TimedTaskListener<V> listener;
private V value;
private int timeOut;
private Timer timer;
private SwingWorker<V, Void> worker;
private boolean hasCompleted = false;
public TimedTask(int timeOut, Task<V> task, TimedTaskListener<V> listener) {
this.task = task;
this.listener = listener;
this.timeOut = timeOut;
}
public V getValue() {
return value;
}
public int getTimeOut() {
return timeOut;
}
protected Task<V> getTask() {
return task;
}
protected TimedTaskListener<V> getListener() {
return listener;
}
public void execute() {
if (timer != null || worker != null) {
return;
}
hasCompleted = false;
worker = new SwingWorker<V, Void>() {
@Override
protected V doInBackground() throws Exception {
value = task.execute();
return value;
}
};
worker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
switch (worker.getState()) {
case DONE:
hasCompleted = true;
timer.stop();
getListener().taskDidComplete(TimedTask.this, value);
break;
}
}
});
timer = new Timer(getTimeOut(), new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (hasCompleted) {
return;
}
getListener().taskIsTakingLongThenExepected(TimedTask.this);
}
});
timer.setRepeats(false);
worker.execute();
timer.start();
}
}
然后您可以将第一个示例中的 startWork 方法替换为...
protected void startWork() {
label.setText("Something wicked this way comes");
TimedTask.Task<Void> task = new TimedTask.Task<Void>() {
@Override
public Void execute() throws Exception {
Thread.sleep(5000);
return null;
}
};
TimedTask<Void> timedTask = new TimedTask(2000, task, new TimedTask.TimedTaskListener<Void>() {
@Override
public void taskIsTakingLongThenExepected(TimedTask task) {
label.setText("Wickedness is taking it's sweet time");
}
@Override
public void taskDidComplete(TimedTask task, Void value) {
label.setText("Wickedness has arrived");
startButton.setEnabled(true);
}
});
timedTask.execute();
}