Source of TimerTester.java

Structures and functions

public class TimerTester

  1: import java.awt.*;
  2: import java.awt.event.*;
  3: import java.util.*;
  4: import javax.swing.*;
  5: import javax.swing.Timer;

  7: /**
  8:    This program shows a clock that is updated once per second.
  9: */
 10: public class TimerTester
 11: {
 12:    public static void main(String[] args)
 13:    {
 14:       JFrame frame = new JFrame();

 16:       final int FIELD_WIDTH = 20;
 17:       final JTextField textField = new JTextField(FIELD_WIDTH);

 19:       frame.setLayout(new FlowLayout());
 20:       frame.add(textField);

 22:       ActionListener listener = new
 23:          ActionListener()
 24:          {
 25:             public void actionPerformed(ActionEvent event)
 26:             {
 27:                Date now = new Date();
 28:                textField.setText(now.toString());
 29:             }
 30:          };
 31:       final int DELAY = 1000;
 32:          // Milliseconds between timer ticks
 33:       Timer t = new Timer(DELAY, listener);
 34:       t.start();

 36:       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 37:       frame.pack();
 38:       frame.setVisible(true);
 39:    }
 40: }