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