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| package regexp;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
public class Test {
public Test() {
initComponents();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Test();
}
});
}
private void initComponents() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField jtf = new JTextField(); // add filter to document
((AbstractDocument) jtf.getDocument())
.setDocumentFilter(new MyDocumentFilter());
frame.add(jtf);
frame.pack();
frame.setVisible(true);
}
}
class MyDocumentFilter extends DocumentFilter {
@Override
public void replace(FilterBypass fb, int i, int i1, String string,
AttributeSet as) throws BadLocationException {
for (int n = string.length(); n > 0; n--) {
char c = string.charAt(n - 1);// get a single character of the
// string
System.out.println(c);
if (Character.isLetter(c)) {
// if its an alphabetic character
super.replace(fb, i, i1, String.valueOf(c), as);
} else {
// it was not an alphabetic character or white space
System.out.println("Not allowed");
}
}
}
@Override
public void remove(FilterBypass fb, int i, int i1)
throws BadLocationException {
super.remove(fb, i, i1);
}
@Override
public void insertString(FilterBypass fb, int i, String string,
AttributeSet as) throws BadLocationException {
super.insertString(fb, i, string, as);
}
} |
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