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import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
public class MainClass {
public static void main(String[] args) throws Exception {
JTextField field = new JTextField(30);
((AbstractDocument) (field.getDocument())).setDocumentFilter(new DocumentFilter() {
public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr)
throws BadLocationException {
System.out.println("insert");
fb.insertString(offset, string.toUpperCase(), attr);
}
public void replace(FilterBypass fb, int offset, int length, String string, AttributeSet attr)
throws BadLocationException {
System.out.println("replace");
fb.replace(offset, length, string.toUpperCase(), attr);
}
});
JFrame frame = new JFrame("User Information");
frame.getContentPane().add(field);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
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