Given the class 'readonly' with the following behavior:
a (protected) integer instance variable named 'val'.
a constructor that accepts an integer and assigns the value of the parameter to the instance variable 'val'.
a method name 'getval' that returns the value of 'val'.
write a subclass named 'readwrite' with the following additional behavior:
any necessary constructors.
a method named 'setval' that accepts an integer parameter and assigns it the the 'val' instance variable.
a method 'isdirty' that returns true if the setval method was used to override the value of the 'val' variable.

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Write a car class having two private member variables called tank and speed. write public methods called pumpgas and gofast. the method pumpgas gets an integer for gas that must be pumped. that value needs to be added to tank (no more than 20 gallons). it must return the amount of gas that is purchased ($4 per gallon). the method gofast should increase the speed by 5 each time it is called.write a constructor for the above class that initialized both variables to zero.write a tostring to display both the tank and speed when the car is printed.modify the car class to implement the interface comparable and an interface called carinter having the public methods in carinter.write the main program to create an array of size 5 of type car. create 5 car objects having each location of the array to refer to one of the cars. test the pumpgas, gofast, equals method on the array items. write an enhanced loop to print all the car values (using a tostring written last time).write a generic method to find the minimum of four items. pass int, double, char, string and car objects to test this method.