Delaying processing using Timer

[Andrew Osborne]

I'm a student taking a Java course where I had to build a fake screen saver
that draws line and refreshes itself after 1 second. I accomplished this
task. But I don't like how fast the line are drawn on the screen. I was
able to slow how quickly the line are being drawn by inserting a for loop
that does nothing. There has to be a better way. Any help would be appreciated.
Please note, this was not part of the assignment. I'm just curious. I
say this because I see people post her looking for someone to complete their
assignments for them.

Code
import javax.swing.*;
import javax.swing.Timer;
import java.awt.*;
import java.awt.event.*;

public class ElevenTwentyOne extends JFrame implements ActionListener{
private Timer timer = new Timer(1000,this);
private int counter = 0;

public ElevenTwentyOne()
{
super("Screen Saver");

setBackground(Color.black);
setSize(640, 480); //Standard windows full screen
show();

timer.start();

}//end ElevenTwentyOne constructor


public void actionPerformed(ActionEvent e)
{
repaint();

}//end actionPerformed

public void paint(Graphics g)
{
int X1,
Y1,
X2,
Y2;

for(int i = 0; i < 100; i++)
{
X1 = 1 + (int) (Math.random() * 100);
Y1 = 1 + (int) (Math.random() * 100);
X2 = 1 + (int) (Math.random() * 800);
Y2 = 1 + (int) (Math.random() * 800);

g.setColor(Color.blue);
g.drawLine(X1 ,Y1,X2,Y2);
for(int b = 0; b < 10000000; b++)
{
//slow things down... find better way
}

}
g.clearRect(0,0,640,480);

}//end paint


public static void main(String arg[])
{
ElevenTwentyOne app = new ElevenTwentyOne();

app.addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}//end windowClosing
}//end WindowAdapter
);
}//end main
}//end class ElvenTwentyOne

[Paul Clapham]

If you want your program to delay for 1 second (1000 milliseconds), just
write

Thread.currentThread().sleep(1000);

But in your case that may not work. As you may or may not have learned in
your course, drawing of Swing controls runs in a separate thread, and you
really want that thread to be the one that executes its "sleep" method. To
do that, I think you'd have to use the following code:

SwingUtilities.invokeLater(new Runnable() {
public void run() {
Thread.currentThread().sleep(1000);
}
});

which puts the "sleep" command into Swing's event-dispatching thread.

PC2

"Andrew Osborne" <aosborne@home.com> wrote in message
news:3abfb98e$1@news.devx.com...
>
> I'm a student taking a Java course where I had to build a fake screen
saver
> that draws line and refreshes itself after 1 second. I accomplished this
> task. But I don't like how fast the line are drawn on the screen. I was
> able to slow how quickly the line are being drawn by inserting a for loop
> that does nothing. There has to be a better way. Any help would be
appreciated.