getTimes.txt

1. What design principles does this code violate?
Simplification
Duplication
2. Refactor the code to improve its design.

int checkValue(String myString, int value){
    if(myString == null){
        throw new MissingPropertiesException("missing interval");
    }
    if (value <= 0) {
        throw new MissingPropertiesException("interval > 0");
    }
    return value
}

public void getTimes(Properties props) throws Exception {
  String valueString;
  int value;

  checkInterval = checkValue(props.getProperty("interval"), value);

  value = checkValue(props.getProperty("duration"), value);
  if ((value % checkInterval) != 0) {
    throw new MissingPropertiesException("duration % checkInterval");
  }
  monitorTime = value;

  value = checkValue(props.getProperty("departure"), value);
  if ((value % checkInterval) != 0) {
    throw new MissingPropertiesException("departure % checkInterval");
  }
  departureOffset = value;
}