The goal of this assignment is to add a set of classes and methods to those developed in Assignment
1. You will implement precisely the public and protected items described in the supplied documentation
(no extra members or classes). Private members will be for you to decide.
Language requirements: Java version 1.8, JUnit 4


Now that we have developed a set of primitives to represent Tile, Block, and Builder, we want to
be able to:
• arrange tiles into a world map,
• load world maps,
• load or enter actions that a builder can perform,
• run the actions, and
• save the updated world map.

In this assignment you will create classes to represent the world map, actions, and a main
function for your application.

Ethical obligations

All work on this assignment is to be your own individual work. As detailed in Lecture 1, code supplied
by course staff is acceptable but there are no other exceptions.
You are expected to be familiar with “What not to do” from Lecture 1 and
If material is found to be “lacking academic merit”, that material may be removed from your
submission prior to marking. No attempt will be made to repair any code breakage caused by doing
If you have questions about what is acceptable, please ask.

Supplied material

• This task sheet
• A .zip file containing html documentation (Javadoc) for the classes and interfaces you are to
write (also on Blackboard). Unzip the bundle somewhere and start with doc/index.html.
• A .zip file containing implementations of the Assignment 1 classes (we have moved these
classes into a new package).


1. Implement each of the following classes and interfaces (described in the Javadoc):
2. Write JUnit4 tests for the methods in the following classes:
• as
• as


The 100 marks available for the assignment will be divided as follows:
Symbol Marks Marked Description
F 55 Electronically Implementation and functionality:
Does the submission conform to the documentation?
S 25 By “humans” Style and clarity.
J 20 Electronically Student supplied JUnit tests:
Do the tests correctly distinguish between correct and incorrect
The overall assignment mark will be A1 = F + S + J with the following adjustments:
1. If F < 5, then S = 0 and J = 0 and “style” will not be marked.
2. If S > F, then S = F.
3. If J > F, then J = F.
For example: F = 22; S = 25; J = 17 ) A1 = 22 + 22 + 17.
The reasoning here is not to give marks to cleanly laid out classes which do not follow the
Functionality marking
The number of functionality marks given will be
F =
Tests passed
Total number of tests
Each of your classes will be tested independently of the rest of your submission. Other required
classes for the tests will be copied from a working version. Functionality testing does not apply to
your JUnit tests.
Note: Where “cannot be X” (e.g., “cannot be null”) is used in the specification, it indicates that
X is not a valid input to the function and the function will not be tested with input X.

Style marking

As a style guide, we are adopting1 the Google Java Style Guide with some modifications:
4.2 Indenting is to be +4 chars not +2.
4.4 Column limit for us will be 80 columns.
4.5.2 First continuation is to be +8 chars.
• All private/“package private” members must be commented (you may use Javadoc comments
but are not required to).
• Java source files must be encoded as either ASCII or UTF-8.
• All public and protected comments are expected to use Javadoc markup (e.g. @param, etc).

There is quite a lot in the guide and not all of it applies to this course (eg no copyright notices).
The marks are broadly divided as follows:
Naming 5
Commenting 6
Structure and layout 8
Good OO implementation practices 6
Note that this category does involve some aesthetic judgement (and the marker’s aesthetic
judgement is final).
All functions and member variables need to be commented for this assignment. Comments for
functions need to explain how the function is used, what the function returns, and what changes
the function makes to its calling instance.
All public and protected member functions and variables must have Javadoc comments..
For functions and variables specified in the assignment, descriptions can be taken from the specification
and added as comments.
Additionally, any section of code (inside a function) that would be difficult for another reader
to understand needs comments that explain what the code does.

Test marking

Marks will be awarded for test sets which distinguish between correct and incorrect implementations2.
A test class which passes everything (or fails everything) will receive a mark of zero.
There will be some limitations on your tests:
1. If your tests take more than 20 seconds to run, they will be stopped and a mark of zero given.
2. Each of your test classes must be less than 300 (non-empty) lines. If not, that test will not be
3. Your tests must only call functions specified in the Javadocs for classes that you are
These limits are very generous, (eg your tests shouldn’t take anywhere near 20 seconds to run).

Electronic Marking

The electronic aspects of the marking will be carried out in a virtual machine. The VM will not be
running Windows and neither IntelliJ nor Eclipse will be involved. For this reason, it is important
that you name your files correctly. It is also important that you do not import any non-standard
It is critical that your code compiles. If one of your classes does not compile, you will recieve
zero for any electronically derived marks for that class.
It is critical that your class, interface and public member names match the Javadocs. If the
names do not match, you could lose marks for all functionality associated with that class, interface
or member. No corrections of typos will be made by staff. It is your responsibility to ensure that
your submission is error-free and meets with the specification.