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copied!<p>No. You are not supposed to override the paintComponent() method. Instead, you should use <code>StyledDocument</code>. You should also delimit the words by your self.</p> <p>Here is the demo, which turns "public", "protected" and "private" to red when typing, just like a simple code editor:</p> <p><img src="https://i.stack.imgur.com/vP6aK.png" alt="enter image description here"></p> <pre><code>import javax.swing.*; import java.awt.*; import javax.swing.text.*; public class Test extends JFrame { private int findLastNonWordChar (String text, int index) { while (--index >= 0) { if (String.valueOf(text.charAt(index)).matches("\\W")) { break; } } return index; } private int findFirstNonWordChar (String text, int index) { while (index < text.length()) { if (String.valueOf(text.charAt(index)).matches("\\W")) { break; } index++; } return index; } public Test () { setDefaultCloseOperation(EXIT_ON_CLOSE); setSize(400, 400); setLocationRelativeTo(null); final StyleContext cont = StyleContext.getDefaultStyleContext(); final AttributeSet attr = cont.addAttribute(cont.getEmptySet(), StyleConstants.Foreground, Color.RED); final AttributeSet attrBlack = cont.addAttribute(cont.getEmptySet(), StyleConstants.Foreground, Color.BLACK); DefaultStyledDocument doc = new DefaultStyledDocument() { public void insertString (int offset, String str, AttributeSet a) throws BadLocationException { super.insertString(offset, str, a); String text = getText(0, getLength()); int before = findLastNonWordChar(text, offset); if (before < 0) before = 0; int after = findFirstNonWordChar(text, offset + str.length()); int wordL = before; int wordR = before; while (wordR <= after) { if (wordR == after || String.valueOf(text.charAt(wordR)).matches("\\W")) { if (text.substring(wordL, wordR).matches("(\\W)*(private|public|protected)")) setCharacterAttributes(wordL, wordR - wordL, attr, false); else setCharacterAttributes(wordL, wordR - wordL, attrBlack, false); wordL = wordR; } wordR++; } } public void remove (int offs, int len) throws BadLocationException { super.remove(offs, len); String text = getText(0, getLength()); int before = findLastNonWordChar(text, offs); if (before < 0) before = 0; int after = findFirstNonWordChar(text, offs); if (text.substring(before, after).matches("(\\W)*(private|public|protected)")) { setCharacterAttributes(before, after - before, attr, false); } else { setCharacterAttributes(before, after - before, attrBlack, false); } } }; JTextPane txt = new JTextPane(doc); txt.setText("public class Hi {}"); add(new JScrollPane(txt)); setVisible(true); } public static void main (String args[]) { new Test(); } } </code></pre> <p>The code is not so beautiful since I typed it quickly but it works. And I hope it will give you some hint.</p>

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