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Tip of the Day
Language: Java
Expertise: Beginner
Nov 13, 2002

Adding a Timer to Your Application


Java swing provides a Timer class to cause an action at a pre-defined rate. For instance, you could have a label that blinks at a pre-defined rate. The class has lot of practical usage.

The constructor takes Timer (int delay, ActionListener listener) as its parameter.

It has a method setCoalesce (boolean) that takes care of multiple pending ActionEvent firings:
 
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class Time extends JFrame implements ActionListener
{
        JLabel l;
        Time()
        {
               Container c=getContentPane();
               c.setLayout(null);
               l =new JLabel("Blink");
               l.setBounds(50,50,40,40);
               c.add(l);
               Timer t=new Timer(500,this);
//               t.setCoalesce(true);
               t.start();
        }
        public void actionPerformed(ActionEvent e)
        {
                if(l.isVisible())
                       l.setVisible(false);
                 else
                        l.setVisible(true);
        }
        static void main(String[]arr)throws Exception
        {
                Time t=new Time ();
                t.setSize(200,200);
                t.setVisible(true);
        }
}
M.V. Prem
 
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