How to use JTextPane to style code in Java?

Java 8Object Oriented ProgrammingProgramming

To style code in a TextPane component use the setText() for text and work with HTML tags. For code, use the <code> tag. Also, do not forget to set the content type to “text/html” −

JTextPane pane = new JTextPane();
pane.setContentType("text/html");

If you won’t set the content type, then the output will display all these HTML tags inside the JTextPane. Now, set the code inside <code> −

pane.setText("<HTML><BODY><CODE> #include <iostream>; <br> using namespace std; <br>main() {<br>cout << \"Hello World\";<br>   return 0;<br>}</CODE><br></BODY></HTML>");

The following is an example wherein we will be displaying a code in the JTextPane. The code we are styling here is a sample C++ code −

Example

package my;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
public class SwingDemo {
   public static void main(String args[]) throws BadLocationException {
      JFrame frame = new JFrame("Demo");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      Container container = frame.getContentPane();
      JTextPane pane = new JTextPane();
      pane.setContentType("text/html");
      pane.setText("<HTML><BODY><CODE> #include <iostream>; <br> using namespace std; <br>main() {<br>cout << \"Hello World\";<br>   return 0;<br>}</CODE><br></BODY></HTML>");
      JScrollPane scrollPane = new JScrollPane(pane);
      container.add(scrollPane, BorderLayout.CENTER);
      frame.setSize(550, 300);
      frame.setVisible(true);
   }
}

The output is as follows. Displays the C++ code in the correct format in a JTextPane −

Output

raja
Published on 31-May-2019 13:03:22
Advertisements