Java tutorial
import javax.swing.JTextArea; import javax.swing.text.DefaultHighlighter; import javax.swing.text.Highlighter; public class Main { public static void main(String args[]) { JTextArea area = new JTextArea(5, 20); area.setText("this is a test."); String charsToHighlight = "aeiouAEIOU"; Highlighter h = area.getHighlighter(); h.removeAllHighlights(); String text = area.getText().toUpperCase(); for (int i = 0; i < text.length(); i += 1) { char ch = text.charAt(i); if (charsToHighlight.indexOf(ch) >= 0) try { h.addHighlight(i, i + 1, DefaultHighlighter.DefaultPainter); } catch (Exception ble) { } } } }