@Override public boolean conditionOk(Example example){
  boolean isOk=true;
  for (  Attribute attribute : checkedAttributes) {
    isOk&=!Double.isNaN(example.getValue(attribute));
  }
  return isOk;
}

@ Override public boolean conditionOk ( Example example ) { boolean isOk = true ; for ( Attribute attribute : checkedAttributes ) { isOk &= ! Double . isNaN ( example . getValue ( attribute ) ) ; } return isOk ; }
returns true if the example does not contain missing values within regarded attributes .
