Java JLabel class example

JLabels

Java Swing Tutorial Explaining the JLabel Component. JLabel, descended from JComponent, is used to
create text labels.
A JLabel object provides text instructions or information on a GUI — display a single line of read-only text, an image or both text and image.
We use a Swing JLabel when we need a user interface component that displays a message or an image.
JØLabels

• Provide text instructions on a GUI
• lRead-only text
• lPrograms rarely change a label’s contents
• lClass JLabel (subclass of JComponent)

JLabel Source Code

import java.awt.GridLayout; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JFrame; import javax.swing.ImageIcon; public class JlabelDemo extends JPanel { JLabel jlbLabel1, jlbLabel2, jlbLabel3; public JlabelDemo() { ImageIcon icon = new ImageIcon("java-swing-tutorial.JPG", "My Website"); // Creating an Icon setLayout(new GridLayout(3, 1)); // 3 rows, 1 column Panel having Grid Layout jlbLabel1 = new JLabel("Image with Text", icon, JLabel.CENTER); // We can position of the text, relative to the icon: jlbLabel1.setVerticalTextPosition(JLabel.BOTTOM); jlbLabel1.setHorizontalTextPosition(JLabel.CENTER); jlbLabel2 = new JLabel("Text Only Label"); jlbLabel3 = new JLabel(icon); // Label of Icon Only // Add labels to the Panel add(jlbLabel1); add(jlbLabel2); add(jlbLabel3); } public static void main(String[] args) { JFrame frame = new JFrame("jLabel Usage Demo"); frame.addWindowListener(new WindowAdapter() { // Shows code to Add Window Listener public void windowClosing(WindowEvent e) { System.exit(0); } }); frame.setContentPane(new JlabelDemo()); frame.pack(); frame.setVisible(true); } }

Output

Download jLabel Source Code

Java JLabel Hierarchy

javax.swing
Class JLabel
java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.JLabel

All Implemented Interfaces: 
Accessible, ImageObserver, MenuContainer, Serializable, SwingConstants
Direct Known Subclasses: 
BasicComboBoxRenderer, DefaultListCellRenderer, DefaultTableCellRenderer, DefaultTreeCellRenderer

JLabel Constructor

JLabel()
Creates a JLabel instance with no image and with an empty string for the title.

JLabel(Icon image)
Creates a JLabel instance with the specified image.

JLabel(Icon image, int horizontalAlignment)
Creates a JLabel instance with the specified image and horizontal alignment.

JLabel(String text)
Creates a JLabel instance with the specified text.

JLabel(String text, Icon icon, int horizontalAlignment)
Creates a JLabel instance with the specified text, image, and horizontal alignment.

JLabel(String text, int horizontalAlignment)
Creates a JLabel instance with the specified text and horizontal alignment.