CS 151 - Lecture 1

Cay S. Horstmann

CS 151

• Third course in computer science
• Software design
• Good software engineering habits
• Teamwork
• For green sheet, contact information, etc., see http://horstmann.com/sjsu/spring2017/cs151

The Textbook

• Great book, if I may say so
• But it's getting a bit outdated
• I am revising the book this academic year
• You'll get draft pages here as the semester progresses
• Don't post them anywhere!
• No need to buy a printed book

What You Need to Succeed

Prerequisites

• CS1/CS2: Loops, arrays, input/output, sets and maps, etc.
• Java

Time

• You can't expect to learn complex skills just by listening to lectures
• Spend 9 hours per week for this class
  • 2.5 hours in class
  • 6.5 hours (!) outside class for preparation and homework

Laptop

• Bring it to each class meeting
• Be able to run a Bash shell

Questions

• Ask questions right away when you are stuck
• Use the online discussion group (Piazza).
• You'll get a better grade if you ask lots of questions.
• Answer your peers' questions. You'll get a better grade if you do.
• Private or confidential questions—email or office hours

Plagiarism and Cheating

• When you submit work, it must be your intellectual creation
• Can you copy and paste?
  • Always ok to copy—pasting is the problem ☺
  • Ok to use code from the problem statement or the textbook without attribution
  • Otherwise, you must attribute the source
• You can post snippets (but not a solution) on Piazza for critique
  • But you cannot copy from Piazza
• Don't email working code—you don't know what the recipient will do with it
  • Sending someone a solution is cheating
• I periodically run a plagiarism checker
• If I find cheating, I don't play Sherlock Holmes to find who wrote it—I report both
• I report everyone whom I find cheating to Student Conduct
  • I have to
  • And I will recommend that an appropriate penalty is for you to fail the course

Git

• You submit all class work via Git
• Make a private repo on BitBucket or GitHub
  • If you use your SJSU email address, BitBucket gives you a free account with unlimited private repos
• Add me as a contributor to your repo. My BitBucket and GitHub ids are cayhorstmann
• Use a single repo for all homework and exams
• Make folders hw1, hw2, lab1, exam1, ...
• Commit at least once a day for homework/every 10 min in an exam
• Push before midnight on due date. Grace period until 6am next morning. No mercy afterwards.
• Never used Git? Check out this CS46B lab.

Adding

• Do homework 1 and send me your answers.
• I will send you an add code when space becomes available. Use it within 24 hours, or it will become invalid
• Show up for all classes/labs even if you haven't received your code

Things To Do Today

• Log into Piazza
• Start reading the textbook
• Install Java 8 and Git on your laptop
• You need bash. If you run Windows, install VirtualBox and a Linux VM.
• Complete Homework 1 and send me your Git repo URL
• Important: In lieu of a roll call today, you must turn in homework 1, or I will drop you from this course for lack of presence/prerequisites.

Lab

• Solving a simple programming problem
• Getting going with Git

A Simple Programming Problem

1. Solve this simple problem: In Java, implement the method Arrays.swapLargestAndSmallest(int[] a) that swaps the largest and smallest element in a. If there are multiple largest or smallest elements, pick the first one.
2. Check your answer in CodeCheck.

Installing Git

• Make an account on BitBucket. Use your SJSU email address.
• Make a repository on BitBucket. Be sure it is a private repo. Call it cs151. Add me (cayhorstmann) as a collaborator with Write access (in Settings → Access Management → Users).
• Start a Bash shell.
• Make sure you have git:

  git --version
  

  It doesn't matter what version you have. If you don't have git, use

  sudo apt-get install git
  

  on Ubuntu. See here for Mac. On Windows, use the Ubuntu virtual machine that you should have installed before class. It has git.
• Clone the repo:

  git clone git@bitbucket.org:yourname/cs151.git

Adding to the Repository

1. In the cs151 subdirectory that was created by git clone, make a subdirectory lab1
2. In that directory, make a file Arrays.java with the solution to the simple programming problem. If you couldn't solve the problem, just put in the outline from CodeCheck.
3. Open a terminal and change to the directory into which you cloned the repo:

   cd cs151
   

4. Type

   git add lab1/Arrays.java

5. Type

   git commit -a -m "Added lab1"

6. Type

   git push origin master

7. In the BitBucket web interface, locate Arrays.java
8. Did you find it? Hooray—you have just reached level 2.