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 Example

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.