Java by API/javax.swing.text/SimpleAttributeSet

new SimpleAttributeSet()

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
public class MainClass extends JFrame {
  private JTextPane textPane = new JTextPane();
  public MainClass() {
    super();
    setSize(300, 200);
    textPane.setFont(new Font("Serif", Font.PLAIN, 24));
    // create some handy attribute sets
    SimpleAttributeSet red = new SimpleAttributeSet();
    StyleConstants.setForeground(red, Color.red);
    StyleConstants.setBold(red, true);
    SimpleAttributeSet blue = new SimpleAttributeSet();
    StyleConstants.setForeground(blue, Color.blue);
    SimpleAttributeSet italic = new SimpleAttributeSet();
    StyleConstants.setItalic(italic, true);
    StyleConstants.setForeground(italic, Color.orange);
    // add the text
    append("NULL ", null);
    append("Blue", blue);
    append("italic", italic);
    append("red", red);
    Container content = getContentPane();
    content.add(new JScrollPane(textPane), BorderLayout.CENTER);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
  protected void append(String s, AttributeSet attributes) {
    Document d = textPane.getDocument();
    try {
      d.insertString(d.getLength(), s, attributes);
    } catch (BadLocationException ble) {
    }
  }
  public static void main(String[] args) {
    new MainClass().setVisible(true);
  }
}