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我试图用类似下面这样一个Java中的进度条的深副本:进度:如何创建原始对象
public class MyProgressSplashScreen extends JWindow
{
private final JProgressBar progressbar;
private final ExecutorService autoProgressExecutor = Executors.newFixedThreadPool(1);
public MyProgressSplashScreen(final int theMin, final int theMax)
{
super();
final JPanel contentPanel = new JPanel(new BorderLayout());
contentPanel.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
if (theMin != -1 && theMax != -1)
{
progressbar = new JProgressBar(SwingConstants.HORIZONTAL, theMin, theMax);
}
else
{
progressbar = new JProgressBar(SwingConstants.HORIZONTAL);
progressbar.setIndeterminate(true);
}
progressbar.setStringPainted(true);
contentPanel.add(progressbar, BorderLayout.SOUTH);
add(contentPanel);
pack();
setAlwaysOnTop(true);
}
public void showProgress(final int theValueTo, final int theEstimatedTimeInSeconds)
{
showProgress(progressbar.getValue(), theValueTo, theEstimatedTimeInSeconds);
}
public void showProgress(final int theValueFrom, final int theValueTo,
final int theEstimatedTimeInSeconds)
{
setVisible(true);
autoProgressExecutor.execute(new Runnable()
{
@Override
public void run()
{
int numberOfSteps = theValueTo - theValueFrom;
long timeToWait = TimeUnit.SECONDS.toMillis(theEstimatedTimeInSeconds)
/numberOfSteps;
for (int i = theValueFrom; i <= theValueTo; i++)
{
progressbar.setValue(i);
try
{
TimeUnit.MILLISECONDS.sleep(timeToWait);
}
catch (final InterruptedException e) { }
}
if (progressbar.getValue() == 100) { setVisible(false); }
}
});
}
}
不过,我不能够通过MyProgressSplashScreen的副本为了让单独的线程更新进度。 例如,下面的程序从0开始计数到10,然后从0重新开始到30,而不应该重置为零!
public class TestSplashScreen
{
private final MyProgressSplashScreen myProgressSplashScreen = new MyProgressSplashScreen(-1,-1);
public static void main(String args[])
{
TestSplashScreen testInvoke = new TestSplashScreen();
testInvoke.synchronize();
}
public void synchronize()
{
Runnable runnable = new Runnable()
{
@Override
public void run()
{
myProgressSplashScreen.showProgress(10, 2);
myProgressSplashScreen.toFront();
MyRunnable myRunnable = new MyRunnable();
myRunnable.setSyncProgressSplashScreen(myProgressSplashScreen);
Thread t1 = new Thread(myRunnable);
t1.start();
}
};
runnable.run();
}
}
class MyRunnable implements Runnable
{
MyProgressSplashScreen syncProgressSplashScreen;
public void setSyncProgressSplashScreen(MyProgressSplashScreen syncProgressSplashScreen)
{
this.syncProgressSplashScreen = syncProgressSplashScreen;
}
@Override
public void run()
{
syncProgressSplashScreen.showProgress(30, 3);
}
}
我通过设计将它调用两次,如果您将两个调用showProgress放在方法synchronize()中的同一线程中,您会看到它正确地更新了进度。问题是,如果我从另一个线程复制MySplashScreen对象调用它,则不会。 – dendini
@dendini为什么你会这么称呼它2次? –