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import javax.swing.JTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;
import javax.swing.text.PlainDocument;
public class Main {
public static void main(String[] argv) {
JTextComponent textComp = new JTextField();
textComp.setDocument(new FixedSizePlainDocument(10));
}
}
class FixedSizePlainDocument extends PlainDocument {
int maxSize;
public FixedSizePlainDocument(int limit) {
maxSize = limit;
}
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
if ((getLength() + str.length()) <= maxSize) {
super.insertString(offs, str, a);
} else {
throw new BadLocationException("Insertion exceeds max size of document", offs);
}
}
}
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