A JTextArea class can extend JTextComponent and allow a user to enter multiple lines of text inside it. A JTextArea can generate a CaretListener interface, which can listen to caret update events. We can set a font to a text inside the JTextArea by using setFont() method.
Example
import java.awt.*; import javax.swing.*; public class JTextAreaTextBoldTest extends JFrame { private JTextArea textArea; public JTextAreaTextBoldTest() { setTitle("JTextAreaTextBold Test"); setLayout(new BorderLayout()); textArea= new JTextArea(); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); Font boldFont=new Font(textArea.getFont().getName(), Font.BOLD, textArea.getFont().getSize()); textArea.setFont(boldFont); // bold text add(textArea); setSize(375, 250); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); setVisible(true); } public static void main(String[]args) { new JTextAreaTextBoldTest(); } }