import java.awt.Color; import javax.swing.JTextPane; import javax.swing.text.Style; import javax.swing.text.StyleConstants; import javax.swing.text.StyledDocument; public class Main { public static void main(String[] argv) throws Exception { JTextPane textPane = new JTextPane(); StyledDocument doc = textPane.getStyledDocument(); // Set text in the range [5, 7) red doc.setCharacterAttributes(5, 2, textPane.getStyle("Red"), true); } }