cs111-F2017-practical7-starter

Designed for use with GitHub Classroom, this repository contains the solution for Practical 7 in Computer Science 111. Since the Travis builds for this repository will initially fail (as evidenced by a red ✗ appearing in the commit logs instead of a green ✔), the programmer is responsible for completing all of the steps needed to satisfy the requirements for the assignment, thus causing a ✔ to instead appear in the commit logs.

Introduction

This assignment requires a programmer to implement and test a Java program, called PasswordCheckerMain, that will produce textual output after reading in a password from a file and then performing some diagnostic tests for this password. This program will construct an instance of a class, call a method provided by this object, and call a method, and then output the result of the computation. Please see the comments in the source code and the laboratory assignment sheet for more details. As verified by Checkstyle, the source code for the PasswordCheckerMain.java and PasswordChecker.java files must adhere to all of the requirements in the Google Java Style Guide.

The source code in the PasswordCheckerMain file must also pass additional tests set by the GatorGrader tool. Specifically, GatorGrader will check the following characteristics of your implementation:

• The PasswordCheckerMain program must:
  • Contain at least five single-line comments and three multi-line comments
  • Call the constructor for the Date class
  • Call the constructor for the PasswordChecker class
  • Call the println method five times to produce the desired output

The source code in the PasswordChecker file must also pass additional tests set by the GatorGrader tool. Specifically, GatorGrader will check the following characteristics of your implementation:

• The PasswordChecker program must:
  • Contain at least four multi-line comments
  • Never call the println method
  • Declare or use the PASSWORD_MINIMUM_LENGTH variable at least two times

When you use the git commit command to transfer your source code to your GitHub repository, Travis CI will initialize a build of your assignment, checking to see if it meets all of the requirements. If both your source code and writing meet all of the established requirements, then you will see a green ✔ in the listing of commits in GitHub. If your submission does not meet the requirements, a red ✗ will appear instead. The instructor will reduce a programmer's grade for this assignment if the red ✗ appears on the last commit in GitHub immediately before the assignment's due date.

A carefully formatted assignment sheet for this project provides more details about the steps that a computer scientist should take to complete this assignment. You can view this assignment sheet by visiting the listing of laboratories on the course web site.

Learning

If you have not done so already, please read all of the relevant GitHub Guides that explain how to use many of the features that GitHub provides. In particular, please make sure that you have read the following GitHub guides: Mastering Markdown, Hello World, and Documenting Your Projects on GitHub. Each of these guides will help you to understand how to use both GitHub and GitHub Classroom.

To do well on this assignment, you should also review Chapters 1 through 4. Finally, please read Sections 5.1 through 5.8 to learn more about conditional logic and iteration constructs. Please see the course instructor or one of the teaching assistants or tutors if you have questions about any of these reading assignments.

Commands

To get started in using the GatorGrader tool, you can change into the directory for this assignment and type the command ./gatorgrader.sh --start in your terminal. Now, if you want to perform all of the checks that will automatically evaluate your assignment, you can type the command ./gatorgrader.sh --check.

Running this command will produce a lot of output that you should carefully inspect. If the last line of the output indicates that GatorGrader judges that there are no mistakes in the assignment, then this means that your source code and writing are passing all of the automated checks. However, if the last line of the output indicates that there are mistakes, then you will need to understand what they are and then try to fix them.

You can also complete several important Java programming tasks by using the gradle tool. For instance, you can compile (i.e., create bytecode from the program's source code if it is a correct program) the program using the command gradle build. There are also additional commands that you can type:

• gradle clean: clean the project of all the derived files
• gradle check: check the quality of the code using Checkstyle
• gradle build: create the bytecode from the Java source code
• gradle run: run the Java program in the command-line
• gradle tasks: display details about the Gradle system

To run one of these commands, you must be in the main directory for this assignment where the build.gradle file is located. Then, you can type the command in the terminal and study the output.

If the course instructor publishes a new version of GatorGrader and asks you to access it, then you need change into the tool's directory by typing cd gatorgrader. Then, you can type the command git pull to download the new source code for the GatorGrader tool. If this command completes successfully, then you can return to the main directory for this practical assignment by typing cd .. and then continuing your work.

Output

Your program should adhere to all of the requirements for the assignment and pass all of the verification checks, and also produce textual output like the following:

Gregory M. Kapfhammer Fri Oct 27 07:10:48 EDT 2017

I will read in a password from a file.
Okay, I read in the password "computerscience2017".

Is the password "computerscience2017" a valid password? No

Thank you for using the PasswordChecker.

Updates

If the course instructor updates the provided material for this assignment and you would like to receive these updates, then you can type this command in the main directory for this assignment:

./gatorgrader.sh --update git@github.com:Allegheny-Computer-Science-111-F2017/cs111-F2017-practical7-starter.git

You should only need to type this command once; typing the command additional times may yield an error message but will not negatively influence the state of your repository. Now, you are ready to download the updates provided by the course instructor by typing:

./gatorgrader.sh --download

This second command can be run whenever the course instructor needs to provide you with new source code for this assignment. However, please note that, if you have edited the files that the course instructor updated, running the previous command may lead to Git merge conflicts. If this happens, you may need to manually resolve them with the help of the instructor or a teaching assistant.

Travis

This assignment uses Travis CI to automatically run the checking programs every time you commit to your GitHub repository. The checking will start as soon as you have accepted the assignment, thus creating your own private repository, and the course instructor enables Travis for it. If you are using Travis for the first time, you will need to authorize Travis CI to access the private repositories that you created on GitHub.

Requirements

The GatorGrader software that supports the checking of this assignment was developed for the following software and versions:

• gradle 4.1
• java 1.8.0
• mdl 0.4.0
• proselint 0.7.0
• python 3.5.2

Problems

If you have found a problem with this assignment's provided source code, then you can go to the Computer Science 111 Practical 7 Starter repository and create an issue by clicking the "Issues" tab and then clicking the green "New Issue" button. If you have found a problem with the GatorGrader tool and the way that it checks you assignment, then you can follow the aforementioned steps to create an issue in its repository. To ensure that your issue is properly resolved, please provide as many details as is possible about the problem that you experienced. If you discover a problem with the laboratory assignment sheet, then please raise an issue in the cs111-F2017-lab-sheets repository and mention this assignment.

Students who find, and use the appropriate GitHub issue tracker to correctly document, a mistake in any aspect of this laboratory assignment will receive free laptop stickers and extra credit towards their grade for it.

Assistance

If you are having trouble completing any part of this project, then please talk with either the course instructor or a teaching assistant during the laboratory session. Alternatively, you may ask questions in the Slack team for this course. Finally, you can schedule a meeting during the course instructor's office hours.