Given the following initial descrition of a Java class, Car: public class Car implements Comparable$<$ Car$>\{$ private String registration; private String make; private String model; private int year; private int mileage; $\}($a$)$ Write the code for the class constructor. $[3]($b$)$ Provide the code for the compareTo$()$ method, such that it can be used to prioritise Car objects in ascending order of mileage, and if they have the same mileage, then to prioritise the newest Car $($higher value for year$).[10]($c$)$ Write the code for a test class which creates a PriorityQueue for Cars, adds three different Car objects to the PriorityQueue, and then removes the Car objects one at a time from the PriorityQueue.