//Course. javaimport java. util\.\*; import java. io\.\*; public class Course { private ArrayList roster; // Collection of Student objects public Course() { roster = new ArrayList(); } public int courseSize() { /* Your code goes here */ } public void addStudent(Student s) { roster. add(s); } // main public static void main(String[] args) { Course course = new Course(); String first; // first name String last; // last name double gpa; // grade point average first = ""Bo""; last = ""Lang""; gpa = 3.1; course. addStudent(new Student(first, last, gpa)); // Add 1st student first = ""Rahul""; last = ""Rose""; gpa = 2.8; course. addStudent(new Student(first, last, gpa)); // Add 2nd student first = ""Mariam""; last = ""Felix""; gpa = 3.7; course. addStudent(new Student(first, last, gpa)); // Add 3rd student System. out. println(""Course size: "" + course. courseSize()); // Expect: 3 } }

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.