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Java Programming Code Examples

Java > Date Time Code Examples

This is a simple text clock. See

This is a simple text clock. See javax.swing.Timer for an explanation of how use this simple timer class. import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import java.util.Calendar; // only need this one class /// TextClock public class TextClock { main public static void main(String[] args) { JFrame clock = new TextClockWindow(); clock.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); clock.setVisible(true); }//end main }//endclass TextClock ////// TextClockWindow class TextClockWindow extends JFrame { instance variables private JTextField timeField; // set by timer listener constructor public TextClockWindow() { // Build the GUI - only one panel timeField = new JTextField(6); timeField.setFont(new Font("sansserif", Font.PLAIN, 48)); Container content = this.getContentPane(); content.setLayout(new FlowLayout()); content.add(timeField); this.setTitle("Text Clock"); this.pack(); // Create a 1-second timer and action listener for it. // Specify package because there are two Timer classes javax.swing.Timer t = new javax.swing.Timer(1000, new ActionListener() { public void actionPerformed(ActionEvent e) { Calendar now = Calendar.getInstance(); int h = now.get(Calendar.HOUR_OF_DAY); int m = now.get(Calendar.MINUTE); int s = now.get(Calendar.SECOND); timeField.setText("" + h + ":" + m + ":" + s); } }); t.start(); // Start the timer }//end constructor }//endclass TextClock