code: public String get(String propertyName, String defaultValue) {
      return valueOf(getProperties().getProperty(propertyName, defaultValue));
    }
docs: Gets the assigned value of the named property as a {@link String} or returns the default value
  if the named property does not exist.
  
  @param propertyName the name of the property to get.
  @param defaultValue the default value to return if the named property does not exist.
  @return the assigned value of the named property as a {@link String} or default value
  if the named property does not exist.
  @see java.util.Properties#getProperty(String)
  @see #getProperties()