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);
