25au ver.
Note: this is for the Autumn 2025 iteration of CSE 121. Looking for a different quarter? Please visit https://courses.cs.washington.edu/courses/cse121/.
Welcome to CSE 121: Introduction to Computer Programming I 🎉
What is this class? What will I learn?
Computing continues to play an ever-increasing role in today’s society. Having an understanding of computing is an essential skill for those in the 21st century; from working in industries more reliant on technology, using computational methods to further scientific understanding, or being an informed citizen in a world with technology all around us.
This course is a first course in computer programming focused on the basics of procedural programming in Java. It assumes students have not taken a previous programming course and do not have substantial other programming experience.
Students with previous experience are encouraged to consider CSE 122 or see the Allen School’s page on introductory courses.
This Week (at a glance)¶
Tuesday (10/28)
- Section 9: Conditionals
Wednesday (10/29)
- Pre-Class Material 10 (Complete before class.)
- Lesson 10:
whileLoops
A lecture @ 11:30 in KNE 130; B lecture at 3:30 in BAG 131 - P2 - Prioritizing Patients released. Due Tuesday (11/11) @ 11:59pm PT.
Thursday (10/30)
- Section 10:
whileLoops - C2 - Password Protector due @ 11:59pm PT.
Friday (10/31)
- Pre-Class Material 11 (Complete before class.)
- Lesson 11: User Input (
Scanner)
A lecture @ 11:30 in KNE 130; B lecture at 3:30 in BAG 131
Calendar¶
Pre-Class
Anything listed in the “pre-class” materials (PCMs) for a day should be read before attending class that day. The PCMs are a first introduction to the most important terms and concepts for that day of class. It is okay if the PCMs don’t make complete sense as we have the rest of the class day to clarify the concepts, but if you don’t do the PCMs, the class session won’t make any sense.
| Topic | Programming / Creative Projects | Resubmissions | ||
|---|---|---|---|---|
| Week 1 | ||||
| Wed 09/24 | LES 00 Course Policies, Hello World! Note: Normally you would complete the Pre-class Work before class. There is nothing you need to complete before class today! | |||
| Thu 09/25 | SEC 00 Welcome resources: materials | |||
| Fri 09/26 | LES 01 Printing, Strings, Variables | |||
| Released C0 I.S. by 11:59pm PT Hello Bugs | ||||
| Week 2 | ||||
| Tue 09/30 | SEC 01 Printing, Strings, Variables resources: materials | |||
| Wed 10/01 | LES 02 Datatypes, Expressions | |||
| Released P0 I.S. by 11:59pm PT Cornbear's Cafe | ||||
| Thu 10/02 | SEC 02 Datatypes, Expressions resources: materials | |||
| Fri 10/03 | LES 03 Revisiting Strings and Variables | |||
| Week 3 | ||||
| Tue 10/07 | SEC 03 Revisiting Strings and Variables resources: materials | |||
| Wed 10/08 | LES 04 for Loops | |||
| Released C1 I.S. by 11:59pm PT ASCII Art | ||||
| Thu 10/09 | SEC 04 for Loops resources: materials | |||
| Released R0 C0, P0 Due 11:59pm PT Resub 0 | ||||
| Fri 10/10 | LES 05 Nested for Loops, Random, Math | |||
| Week 4 | ||||
| Tue 10/14 | SEC 05 Nested for Loops, Random, Math resources: materials | |||
| Wed 10/15 | LES 06 Methods, Parameters, Scope | |||
| Released P1 I.S. by 11:59pm PT Election Simulator | ||||
| Thu 10/16 | QUIZ 00 Quiz 0: Printing, Datatypes, Expressions, Variables, Strings, for Loops resources: practice materials | |||
| Released R1 C0, P0, C1 Due 11:59pm PT Resub 1 | ||||
| Fri 10/17 | LES 07 Methods, Parameters, Returns | |||
| Week 5 | ||||
| Tue 10/21 | SEC 07 Methods, Parameters, Returns resources: materials | |||
| Wed 10/22 | LES 08 Methods, Parameters, Returns 2 | |||
| Released C2 I.S. by 11:59pm PT Password Protector | ||||
| Thu 10/23 | SEC 08 Methods, Parameters, Returns 2 resources: materials | |||
| Released R2 C0, P0, C1, P1 Due 11:59pm PT Resub 2 | ||||
| Fri 10/24 | LES 09 Conditionals | |||
| Week 6 | ||||
| Tue 10/28 | SEC 09 Conditionals resources: materials | |||
| Wed 10/29 | LES 10 while Loops | |||
| Thu 10/30 | SEC 10 while Loops resources: materials | |||
| Released P2 I.S. by 11:59pm PT Prioritizing Patients | Released R3 P0, C1, P1, C2 Due 11:59pm PT Resub 3 | |||
| Fri 10/31 | LES 11 User Input ( Scanner) pre-class: materials | |||
| Week 7 | ||||
| Tue 11/04 | SEC 11 Scanner (User Input) | |||
| Wed 11/05 | LES 12 Putting It All Together | |||
| Thu 11/06 | QUIZ 01 Quiz 1: for Loops, Nested for Loops, Random, Math, Methods, Parameters, Returns, Conditionals, while Loops | |||
| Released R4 Resub 4 | ||||
| Fri 11/07 | LES 13 Arrays | |||
| Week 8 | ||||
| Tue 11/11 | HOLIDAY No Section - Veterans Day | |||
| Wed 11/12 | LES 14 Reference Semantics | |||
| Released C3 Dance Dance Arrayvolution | ||||
| Thu 11/13 | SEC 14 Arrays, Reference Semantics | |||
| Released R5 Resub 5 | ||||
| Fri 11/14 | LES 15 2D Arrays | |||
| Week 9 | ||||
| Tue 11/18 | SEC 15 2D Arrays | |||
| Wed 11/19 | LES 16 Array Patterns | |||
| Released P3 2DNArray Sequencing | ||||
| Thu 11/20 | QUIZ 02 Quiz 2: Conditionals, while Loops, User Input (Scanner), Arrays, Reference Semantics | |||
| Released R6 Resub 6 | ||||
| Fri 11/21 | LES 17 Putting It Even More Together | |||
| Week 10 | ||||
| Tue 11/25 | HOLIDAY No (Official) Section | |||
| Wed 11/26 | HOLIDAY No Lecture | |||
| Thu 11/27 | HOLIDAY Thanksgiving | |||
| Fri 11/28 | HOLIDAY No Lecture - Native American Heritage Day (Observed) | |||
| Week 11 | ||||
| Tue 12/02 | SEC 17 Array Patterns | |||
| Wed 12/03 | LES 18 Final Exam Review | |||
| Thu 12/04 | SEC 18 Final Review | |||
| Fri 12/05 | LES 19 Wrap-Up, Victory Lap! | |||
| Week 12 | ||||
| Tue 12/09 | Finals Week | |||
| Wed 12/10 | EXAM Final Exam 12:30 - 2:20pm | |||
| Thu 12/11 | Finals Week | |||