code: public int getInteger(String key, int defaultValue) {
  		String argument = getProperty(key, null);
  		return argument == null
  			? defaultValue
  			: Integer.parseInt(argument);
  	}
docs: Searches for the property with the specified key in this property list.
  If the key is not found in this property list, the default property list,
  and its defaults, recursively, are then checked. The method returns the
  default value argument if the property is not found.
  
  @param key          the hashtable key.
  @param defaultValue a default value.
  @return the value in this property list with the specified key value parsed as an int.