Lab Exam 22/11/2005

We want to realize a program to be used by a DVD rental shop to manage DVDs to be rented. For each DVD, the following information is stored:

If the number of days that the DVD is rented is 0, this means that the DVD is not rented.

Part 1. Write a class DVD that implements the following methods:

DVD(String title, int age) : costructor that, given title and age, constructs a DVD that is initially not rented;
String getTitle() : that returns the title of the DVD;
int getAge() : that returns the age for which the DVD is suited;
int getDays() : that returns the number of days that the video is rented;
String getName() : that returns the name of the person that rented the DVD, if the DVD is rented, and null otherwise;
void rentDVD(String n, int d) : that rents the DVD to the person with name n for d days, if it is not already rented, and otherwise does nothing;
void giveBackDVD() : that sets the status of the DVD to being not rented (this means also that there is no person who rents the DVD);
String toString() : that returns a string with all the information about the DVD.

Example program: TestDVD.Java

Part 2.

Write a class UseDVD, client of DVD, that contains the following public static method:

static String shortestRental(DVD d1, DVD d2): that, given two DVDs d1 and d2, returns the name of the person who rented for the shortest period the DVDs among d1 and d2. If both d1 and d2 are rented for the same number of days, the method should return the name of the person who rented d1. If only one of d1 or d2 is rented, the method should return the name of the person who rented that DVD. If both d1 and d2 are not rented, the method should return null.