Computer Land

You will be constructing a series of elecrtonic devices and integrating them in a short program. You should heavily use abstract classes and interfaces.

What you need to do

You will need to implement the following classes/interfaces, obeying the following (but there may be more you need to do, based on ComputerLand code):

• PowerSource (a concrete class), which supports the following:
  • Holds up to 6 ElectronicDevice objects (in an array)
  • An attach() method, per use in ComputerLand
  • Has a printInventory() method that calls getSummary() on all its devices
• ElectronicDevice (an interface), with the following
  • A getSummary(), as used in PowerSource (see below), returns a String
• Computer (an abstract class that is a type of ElectronicDevice), with the following:
  • Constructor that takes name (String) and storage (int) as parameters. The storage parameter is just a number, there are no units (like GB or MB).
  • Can be associated with a Printer, as shown in ComputerLand code
  • Must support a save() method that takes an amount of storage needed and decrements the storage available (no filenames required).
  • Has an abatract method called getOperatingSystem() that returns a String
  • Implements getSummary()
• Printer (an interface that is a type of ElectronicDevice)
  • Supports print() method that takes a jobName (String) and number of pages (int). It returns nothing
  • Supports a scan() method that takes a jobName, number of pages to scan, and reference to a Computer to save the data to. It returns nothing.
• AppleMacbook (a concrete type of Computer)
  • Has "OS X" operating system
• DellDesktop (a concrete type of Computer)
  • Has "Windows" operating system
• EpsonPrinter (a concrete type of Computer that also can act as a Printer)
  • Every page virtually scanned requires 5 storage units on target computer
  • Logs each virtual scan to output (see below)
  • Logs each page virtually printed (as it is printed) to output (see below)
  • Has "Linux" operating system
• ComputerLand (included, see below)

You must combine your work with the following:

public class ComputerLand {
public static void main(String[] args) {
Computer mac = new AppleMacbook("MyMac", 1000);
Computer dell = new DellDesktop("MyDell", 500);
Printer epson = new EpsonPrinter("MyEpson", 2);
PowerSource source = new PowerSource();
source.attach(mac);
source.attach(dell);
source.attach(epson);
mac.addPrinter(epson);
dell.addPrinter(epson);
mac.scan("Passport application", 10);
mac.print("Story", 5);
dell.scan("Taxes", 25);
dell.print("License areement", 2);
source.printInventory();
}
}

so that the following is produced (exactly) when ComputerLand is run:

Scanning 10 pages of Passport application to MyMac
Printing page 0 of Story
Printing page 1 of Story
Printing page 2 of Story
Printing page 3 of Story
Printing page 4 of Story
Scanning 25 pages of Taxes to MyDell
Printing page 0 of License areement
Printing page 1 of License areement
=== INVENTORY ===
MyMac (running OS X) with storage=950
MyDell (running Windows) with storage=375
MyEpson (running Linux) with storage=2