CS 151

Cay S. Horstmann

Day 2

• Pre-class reading: Read Section 2.1, 2.6, Section 2.12 intro and subsection 2.12.1 before class. Run the mail system program.
• Clicker questions
  • Put your answer into Piazza
• Lab
  • Counts as participation
• Discussion

Day 2 Clicker Question 1

Which of the following is not a phase of the software development process described in Section 2.1?

1. The analysis phase
2. The design phase
3. The implementation phase
4. The testing phase

Day 2 Clicker Question 2

Which of the following is not a goal of the design phase?

• Identify classes
• Identify packages
• Identify methods
• Identify class relationships

Day 2 Clicker Question 3

How does a voice mail user delete messages in the application described in Section 2.10.1?

• Messages are automatically deleted after listening to them
• By selecting the 3 key after listening to a message
• By selecting the 3 key after listening to all new messages
• Messages are never deleted.

Lab

• Work with a buddy
• One of you (the “coder”) codes, the other (the “scribe”) types up the answers.
• One of you submits the code in the lab2 subdirectory of your personal repo, the other submits a file report.txt in the lab2 subdirectory of your repo.
• Put the name of the coding buddy into the report
• Push your repo when you are done
• You don't have to complete all parts, but you have to be present and do your best.

The Lab Report File

1. Scribe: Make a directory to hold your lab work and put an empty file in it.

   cd ~/cs151
   mkdir lab2
   touch lab2/report.txt

2. Now open the file in your favorite text editor.
   • In the hopefully unlikely case that your favorite text editor is Mac TextEdit, be sure to save in plain text, not rich text.
   • If you have no favorite text editor, and you want help from me, use Emacs. It is installed in the virtual machine. Start Emacs by typing emacs & into a terminal window. The very first time you use Emacs, select Options -> Use CUA keys(Cut/Paste with C-x/C-c/C-v) and Options->Save Options. To open a file, select File -> Open File from the menu and navigate to the file that you want to open (in our case ~/cs151/lab2/report.txt).
3. Type in today's date and the names of yourself and your lab buddy. Save your file.
4. Add your file and push your repo.

   git status
   git add lab2
   git commit -a -m "Started lab 2"
   git push

The Book Code

1. You need to be familiar with the sample code in the book
2. Clone the repo that contains the code
   • I fix it when I find typos or update sections
   • You pull updates to get those changes
3. Open a terminal and type

   cd
   git clone https://bitbucket.org/cayhorstmann/oodp3code

4. Now you have a directory oodp3code
5. Is this directory inside our outside your cs151 directory? Why?
6. Where is the code for the voice mail simulation?
7. The scribe puts answers to these questions into lab2/report.txt

The Lab Code

1. Coder: Make a lab2 directory inside your repo (~/cs151):

   mkdir ~/cs151/lab2
   

2. Coder: Copy the oopd3code/ch02/mail directory into your lab2 directory:

   cp -R ~/oodp3code/ch02/mail ~/cs151/lab2
   

3. Scribe: What is inside the coder's ~/cs151/lab2/mail directory now? Have her/him show you. You can just write “... files with extension ...”
4. Coder: Type

   git status

   Then add the lab2 directory to git.
5. Scribe: How did the coder do that?

Eclipse

1. Coder: Fire up Eclipse and make a new Java project.
   • IMPORTANT: When you make a new Java project in Eclipse, its default is to make a brand-new project.
   • Huh? That makes no sense. In real life, you never start with nothing.
   • Uncheck the “Use default location” checkbox and browse to the ~/cs151/lab2/mail directory. Finish the wizard.
   • NOTE: If you use IntelliJ, VS Code, NetBeans, or whatever, you follow the same principle. Look for an option to make a project from existing sources. I leave it to you to adjust the steps.
2. Coder: Build and run the program. Provide some simple usage example where someone leaves a message and someone else listens to it. Then terminate the program.
3. Scribe: What happens when the coder runs it?
   • From now on, I'll skip the Coder/Scribe stuff. You know who you are.

Discussion

Discuss with your buddy and be prepared to report to the class.

• Look at the classes in the voice mail simulation? Which is the simplest? Which is the most complex?
• How many message queues does a mailbox have? Why?
• Where are the mailboxes stored?
• Which methods were called with the simple usage example?
• Suppose we had access to a voice system for speaking the prompts and listening to user input. Which classes would stay unchanged? Which classes would change?