Convert checkbox inputs to boolean (Struts does this for you).  Throw the
booleans into an array or List.

boolean isQ1 = checks.get(0);
if ( isQ1 )
{
  for ( int ix = 1; ix < checks.size(); ++ix )
  {
    if ( checks.get(ix) )
    {
      return VALID;
    }
  }
  return INVALID;
}
else
{
  for ( int ix = 1; ix < checks.size(); ++ix )
  {
    if ( checks.get(ix) )
    {
      return INVALID;
    }
  }
  return VALID;
}