CSC305 Lecture 08

Individual Software Design and Development
Multithreading
(202510)

1. Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.info o ffi ce: 14 -227 CSC 305 Individual Software Design and Development Lecture 08. Multithreading
2. De f inition • Concurrent or P a r a llel execution of t a sks • Improves perform a nce a nd responsiveness • Core concept in softw a re • Allows multiple t a sks to run concurrently within the s a me progr a m 2
3. Thread vs Process Process • Independent progr a m with its own memory sp a ce • H a s a m a in thre a d (the “m a in” method in J a v a ) Thre a d • Runs inside a process • Sh a res process memory/resources with other thre a ds An a logy: • Process = O ff ice building • Thre a d = Employees working in the s a me o ff ice 3
4. Java and Multithreading • Thre a d cl a ss • Runn a ble interf a ce 4
5. Example Without Multithreading
7. Example With Multithreading
11. Analogy 11
13. Questions 13
14. Lab
15. Assignment 01 15
16. Assignment 01 • When click on Open, show a JFileChooser to select a folder. • Re a d a ll f ile n a mes from the folder a nd displ a y them in the JList or JTextAre a . • Use the f irst f ile in the list to: • Count lines → dr a w a box sized by line count. • Count if / switch / for / while → dr a w a nother box sized by complexity. • Comp a ring box sizes should show di ff erence. For example: 100 lines a nd 100 control st a tements → both boxes s a me size. • If f ile h a s @ a uthor a nd @version → dr a w h a ppy/serious f a ce. Otherwise → dr a w s a d f a ce. • Submit your code a nd your Cl a ss Di a gr a m 16
17. CSC 305 Individual Software Design and Development Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Fall 2025 Copyright. These slides can only be used as study material for the class CSC305 at Cal Poly. They cannot be distributed or used for another purpose.