| Код | public class LengthFilter extends DocumentFilter
{
private int currentLength;
private int maxLength;
public LengthFilter(int currentLength, int maxLength)
{
this.currentLength = currentLength;
this.maxLength = maxLength;
}
public void remove(FilterBypass fb, int offset, int length) throws BadLocationException
{
currentLength -= length;
fb.remove(offset, length);
}
public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException
{
if((currentLength + string.length()) <= maxLength)
{
currentLength += string.length();
fb.insertString(offset, string, attr);
}
}
public void replace(FilterBypass fb, int offset, int length, String string, AttributeSet attr) throws BadLocationException
{
if((currentLength - length + string.length()) <= maxLength)
{
currentLength += string.length() - length;
fb.replace(offset, length, string, attr);
}
}
} |
| Код | JTextField textField = new JTextField();
AbstractDocument doc = (AbstractDocument) textField.getDocument();
doc.setDocumentFilter(new LengthFilter(doc.getLength(), 10)); |
|
