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    <p>for listening changes into JTextComponent is there DocumentListener, if you have to need control over inputed Char, sings, whitespace chars or word(s) you have to implements DocumentFilter</p> <p>notice for Chars reservated by programing language(s) you have to use double escapes, </p> <p><code>\\(</code> instead of <code>(</code> </p> <p>or </p> <p><code>\\{</code> instead of <code>{</code> </p> <p>otherwise you get </p> <pre><code>Exception in thread "AWT-EventQueue-0" java.util.regex.PatternSyntaxException: Illegal repetition </code></pre> <p>for example</p> <pre><code>import java.awt.*; import java.util.ArrayList; import java.util.List; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; public class TextAreaTest extends JFrame { private static final long serialVersionUID = 1L; private JTextArea textArea; public TextAreaTest() { textArea = new JTextArea(); textArea.setPreferredSize(new Dimension(60, 32)); textArea.setOpaque(true); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); ((AbstractDocument) textArea.getDocument()).setDocumentFilter(new DocumentFilter() { @Override public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException { string = string.replaceAll("\\{", "\\{}"); super.insertString(fb, offset, string, attr); } @Override public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException { text = text.replaceAll("\\{", "\\{}"); //TODO must do something here super.replace(fb, offset, length, text, attrs); } }); textArea.getDocument().addDocumentListener(new DocumentListener() { @Override public void changedUpdate(DocumentEvent e) { update(e); } @Override public void insertUpdate(DocumentEvent e) { update(e); } @Override public void removeUpdate(DocumentEvent e) { update(e); } private void update(DocumentEvent e) { List&lt;String&gt; lines = getLines(textArea); String lastLine = lines.get(lines.size() - 1); int tabbedTextWidth = Utilities.getTabbedTextWidth(new Segment( lastLine.toCharArray(), 0, lastLine.length()), textArea.getFontMetrics(textArea.getFont()), 0, null, 0); int lineHeight = getLineHeight(textArea); if (lines.size() * lineHeight &gt; textArea.getHeight() || tabbedTextWidth &gt; textArea.getWidth()) { System.out.println("Too big! Should refuse the update!"); } } }); getContentPane().add(textArea); } private static List&lt;String&gt; getLines(JTextArea textArea) { int lineHeight = getLineHeight(textArea); List&lt;String&gt; list = new ArrayList&lt;String&gt;(); for (int num = 0;; num++) { int i = textArea.viewToModel(new Point(0, num * lineHeight)); int j = textArea.viewToModel(new Point(0, (num + 1) * lineHeight)); if (i == 0 &amp;&amp; j == 0) { continue; } if (textArea.getDocument().getLength() == i &amp;&amp; i == j) { break; } String s = removeTrailingNewLine(textArea.getText().substring(i, j)); list.add(s); //System.out.println(i + " " + j + " = " + s); } return list; } private static int getLineHeight(JTextArea textArea) { return textArea.getFontMetrics(textArea.getFont()).getHeight(); } private static String removeTrailingNewLine(String s) { if (s.endsWith("\n")) { return s.substring(0, s.length() - 1); } else { return s; } } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { @Override public void run() { TextAreaTest test = new TextAreaTest(); test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); test.pack(); test.setVisible(true); } }); } } </code></pre>
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    1. COToo complex, but got the idea inside the DocumentFilter class. +1 for this :-)
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    2. COhmmm I think there isn't another, easiest and faster way
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