Before attempting this project, be sure you have completed all of the reading assignments, nongraded exercises, discussions, and assignments to date.Design and implement Java program as follows:1) Implement converter class hierarchy as follows:a. Converter class which includes:? Private attribute for input of data type double? Default constructor with no parameter which sets input to Double.NaN? Overloaded constructor with input for parameter? Get and set methods for input attribute? Method convert() which returns input valueb. TemperatureConverter class which is a child of Converter and includes:? Constructors which call parent constructors? Overridden convert() method to convert input (Fahrenheit temperature) toCelsius and returns the value. If the instance has no input value, it shouldreturn Double.NaN? Use the following formula for conversion: C = ((F-32)*5)/9c. DistanceConverter class which is a child of Converter and includes:? Constructors which call parent constructors? Overridden convert() method to convert input (distance in miles) to distancein kilometers and returns the value. If the instance has no input value, itshould return Double.NaNd. Use the following formula for conversion: KM = M * 1.609