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How to create JLabel to hold multiline of text using HTML in Java?
In Java Swing, the JLabel component by default displays only single-line text. To create a JLabel that can hold multiple lines of text, we need to use HTML formatting within the label text. This allows us to use HTML tags like <br> for line breaks and other HTML formatting elements.
Syntax
Following is the syntax to create a multiline JLabel using HTML −
JLabel label = new JLabel("<html>Line1<br>Line2</html>");
For more complex formatting with alignment −
JLabel label = new JLabel("<html><strong>Line1<br>Line2</strong></html>", JLabel.LEFT);
How It Works
When a JLabel's text starts with <html>, Swing's HTML renderer processes the content and applies HTML formatting. The <br> tag creates line breaks, while other HTML tags like <strong>, <em>, and <font> can be used for text styling.
Key HTML tags useful in JLabel −
- <br> − Creates line breaks
- <strong> − Makes text bold
- <em> − Makes text italic
- <font> − Changes font color and size
- <center> − Centers text alignment
Example − Basic Multiline JLabel
Following example demonstrates creating a simple multiline JLabel using HTML −
import java.awt.Font;
import javax.swing.*;
public class MultilineJLabelDemo {
public static void main(String args[]) {
JFrame frame = new JFrame("Multiline JLabel Example");
// Create multiline JLabel with HTML
JLabel label = new JLabel("<html><strong>Welcome to TutorialsPoint<br>Java Swing Tutorial</strong></html>", JLabel.LEFT);
label.setBounds(50, 50, 300, 60);
label.setFont(new Font("Arial", Font.PLAIN, 14));
frame.add(label);
frame.setSize(400, 200);
frame.setLayout(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
The output displays a JLabel with two lines of bold text −
Welcome to TutorialsPoint Java Swing Tutorial
Example − Advanced HTML Formatting
Following example shows more advanced HTML formatting options in JLabel −
import java.awt.*;
import javax.swing.*;
public class AdvancedMultilineJLabel {
public static void main(String args[]) {
JFrame frame = new JFrame("Advanced Multiline JLabel");
// Create JLabel with complex HTML formatting
String htmlText = "<html>" +
"<center><font color='blue' size='5'><strong>TutorialsPoint</strong></font></center>" +
"<br>" +
"<font color='green'>Learn Java Programming</font><br>" +
"<font color='red'><em>Swing GUI Components</em></font><br>" +
"<font color='purple'>HTML in JLabel</font>" +
"</html>";
JLabel label = new JLabel(htmlText);
label.setBounds(50, 30, 300, 120);
frame.add(label);
frame.setSize(400, 200);
frame.setLayout(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
This creates a formatted multiline label with different colors and styles −
TutorialsPoint (blue, bold, large, centered)
Learn Java Programming (green text)
Swing GUI Components (red italic text)
HTML in JLabel (purple text)
Example − Using HTML Lists in JLabel
Following example demonstrates using HTML list formatting in JLabel −
import javax.swing.*;
import java.awt.*;
public class JLabelWithHTMLList {
public static void main(String args[]) {
JFrame frame = new JFrame("JLabel with HTML List");
String listHTML = "<html>" +
"<strong>Java Topics:</strong><br>" +
"<ul>" +
"<li>Object-Oriented Programming</li>" +
"<li>Exception Handling</li>" +
"<li>Collections Framework</li>" +
"<li>Swing GUI</li>" +
"</ul>" +
"</html>";
JLabel listLabel = new JLabel(listHTML);
listLabel.setBounds(30, 30, 300, 150);
listLabel.setVerticalAlignment(SwingConstants.TOP);
frame.add(listLabel);
frame.setSize(400, 250);
frame.setLayout(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
The output shows a properly formatted bulleted list within the JLabel −
Java Topics: ? Object-Oriented Programming ? Exception Handling ? Collections Framework ? Swing GUI
Key Points
-
HTML Start Tag − The text must begin with
<html>to enable HTML rendering in JLabel. -
Line Breaks − Use
<br>tags to create line breaks instead of\n. -
Text Formatting − HTML tags like
<strong>,<em>,<font>work within JLabel. - Performance − HTML rendering is slower than plain text, so use it only when needed.
- Size Adjustment − Increase the JLabel's height to accommodate multiple lines of text.
Conclusion
Creating multiline JLabels in Java Swing requires using HTML formatting with the <html> tag and <br> elements for line breaks. This approach enables rich text formatting including colors, fonts, lists, and other HTML styling within JLabel components, making them more versatile for complex GUI layouts.
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