public double getDouble(final String name, final double defaultValue) {
    if (containsKey(name)) {
      return Double.parseDouble(get(name).trim());
    } else {
      return defaultValue;
    }
  }
Returns the double representation of the value. If the value is null, then the default value is
returned. If the value isn't a double, then a parse exception will be thrown.
dss-appconn/appconns/dss-eventchecker-appconn/src/main/java/com/webank/wedatasphere/dss/appconn/eventchecker/utils/Props.java