Java，。
Purpose
The purpose of this project is to provide non-trivial practice in the use of Java object-oriented programming features to implement an object-oriented design and have a bit of fun doing it.
Resources Needed
You will need a computer system with Java 8 or greater SE edition run-time and Java Development Kit (JDK). You may optionally use a Java IDE for example NetBeans, Eclipse, etc. However application builders are not allowed.
Submitted Files
Design and Analysis:
This is an informal essay-style single-spaced word-processed document. The file formats accepted will be announced at project assignment. The length of the document should be between 1 and 1.5 pages. The following subjects should be discussed in this order:
- General program design. How is the program organized? What major data structures were used? How did you divide the functionality among your classes? How are commands processed? Etc.
- What alternative approaches were considered and why were they rejected?
- What did you learn from doing this project and what would you do differently?
Source files
Each public class must be contained in a separate Java source file. Only one source file will have a main() method and this source will be named VendingMachineSimulator.java. Other source/class names are up to you following the guidelines specified so far in the course.
The format of the Java source must meet the general Java coding style guidelines discussed so far during the course. Pay special attention to naming guidelines, use of appropriate variable names and types, variable scope (public, private, protected, etc.), indentation, and comments. Classes and methods should be commented with JavaDoc-style comments (see below). Please use course office hours or contact the instructor directly if there are any coding style questions.
JavaDocs
Sources should be commented using JavaDoc-style comments for classes and methods. Each class should have a short comment on what it represents and use the @author annotation. Methods should have a short (usually 1 short sentence) description of what the results are of calling it. Parameters and returns should be documented with the @param and @return annotations respectively with a short comment on each.
JavaDocs must be generated against every project Java source file. They should be generated with a - private option (to document all protection-level classes) and a -d [dir] option to place the resulting files in a javadocs directory/folder at the same level as your source files. See the JavaDocs demonstration for more details.
Submit file
The submit file is to be a Zip file containing your design and analysis document, your Java sources, and your javadocs directory/folder. Any appropriate file name for this Zip file is acceptable.
Collaboration
It is encouraged to discuss technical or small design parts of this project with your fellow students. However the resulting design and implementation must be your own. For example, it is acceptable to discuss different ways of maintaining the vending machine state but not detailed design or implementation information on processing the purchase command. When in doubt contact your instructor via email.
Program Specification
- Create a new multi-class Java program which implements a vending machine simulator which contains the following functionality:
- A) At program startup, the vending machine is loaded with a variety of products in a variety of packaging for example soda/tonic/Coke in bottles, peanuts in bags, juice in cartons, etc. Also included is the cost of each item. The program should be designed to easily load a different set of products easily from a file. You must supply an example product file with your submission. The format of your product file is up to you.
Also at program startup, currency should be loaded via a file into the vending machine. Currency should consist of different monetary objects for the specified currency, for example in USD $1 bills, $5 bills, quarters, dimes, etc. Your program should be designed to use different national currencies easily (for example the Euro) without changing source code. This implies specific currency information should not be hard-coded, for example names, symbols, etc. Money should be maintained as paper bills and coins, not just amounts. You must supply an example currency file with your submission. The format of your currency file is up to you.
- B) A menu of commands must be provided. The menu should consists of the following commands using the command numbers indicated:
- Display the list of commands
- Display the vending machine inventory. For each item, this command should result in displaying a description and current quantity.
- Display the money currently held in the vending machine.
- Purchase an item. The result of this selection should be the following actions:
- Prompt the user to indicate what item to purchase
- Prompt the user to specify what monetary items are being used for payment (the actual items for example quarters, dimes, etc.), not a money amount
- If the user specified enough money to purchase the selected item, the item is purchased (deducted from inventory), supplied money is added to the vending machine, and any change is returned in the form of monetary items (quarters, dimes, etc.).
- d) If the user did not specify enough money for the selected item, the transaction is aborted with the supplied money not added to the machine (not accepted) and the product not purchased (i.e. the state of the vending machine is unchanged).
- Exit - exits the program displaying a departing message.
- Additional points to consider:
- A) You can use the Java Standard Edition (SE) API library as supplied by Oracle (AKA Sun) except the collection classes (i.e. not ArrayList, Map, Vector, etc.). These other collections will be covered later in the course.
- B) When developing complex classes, consider creating a main() method to test them out. Once tested successfully, delete or comment out the main() method.
- C) You should generate error messages when appropriate, for example on invalid input values or not enough money supplied for the selected item to purchase. Exceptions will be covered later in the course. For this project displaying appropriate messages on the console is fine.
Other Activates
- Observe the presentation on JavaDocs.
- Observe the Vending Machine Simulator demonstration for an example of one implementation.
- Create a compressed zipped folder containing your Design and Analysis document, your Java source code files, and your javadocs folder.
- Submit your compressed zipped folder as directed by your instructor.