Write a program in Java to compute the average gas mileage of automobiles. The program must

have the following:

A class named Automobile $($library$)$ with the following:

One constructor initializes the model year only.

One method is to set the gas mileage.

One method to compute the average gas mileage.

One method to show the output $($average gas mileage$)$ is named

ShowAvgMileage.

One class named Sedan inherits Automobile class along with additional methods as

follows:

Override the ShowAvgMileage method of a superclass by adding the phrase "for

a sedan", as shown in Sample Output.

One class named Minivan also inherits Automobile class along with the following:$|$

Override the ShowAvgMileage method of a superclass by adding the phrase "for

a minivan", as shown in Sample Output.

One class named FamilySedan inherits Sedan class along with the following:

Override the ShowAvgMileage method of a superclass by adding the phrase "for

a family sedan", as shown in Sample Output.

The Main function will stay in another class from where the constructors and all other

methods will be invoked through objects named: famSed$1($of FamilySedan class$),$

famSed$2($of FamilySedan class$),$ and minivan $($of Minivan class$).$

Inputs are to be taken inside the Main function from the user. The program will show the

outputs on the screen.