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CSCI E-70

CSCI E-70. Graphical User Interface Programming in Java 29 January 2003. Instructor: Daniel Bromberg, Mitsubishi Electric Research Labs. Welcome to E-70!. Extend Java skills to advanced client-side libraries the java.awt and javax.swing package families Apply skills with generic libraries

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CSCI E-70

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  1. CSCI E-70 Graphical User Interface Programming in Java 29 January 2003 Instructor: Daniel Bromberg, Mitsubishi Electric Research Labs CSCI E-70 Lecture 1 / Bromberg

  2. Welcome to E-70! • Extend Java skills to advanced client-side libraries • the java.awt and javax.swing package families • Apply skills with generic libraries • java.util.Collection, java.net, java.lang, ... • Improve programming fluency • Apply data structures to solve cool problems • Learn more Object-oriented design, techniques • Perfect Java language knowledge: syntax, idioms, limitations • Learn the multi-threaded, event-driven, framework-based, visual modeling way of life • Make programs ordinary people can actually use • Think hard, code a lot, have fun CSCI E-70 Lecture 1 / Bromberg

  3. Course Layout • Lectures • Every Wednesday from Jan. 29 to May 14 excl. holidays • Maxwell Dworkin G135, 5:30-7:30 PM • 5 minute break at the hour • Primarily presentation and demonstrations by Instructor • Theory, example, motivate, guide to important study points • Present homeworks, projects, tests; outline requirements • Announce changes in policy, schedule • Questions and discussions as needed • Section • Tentative After lecture, 8-9 PM, Location TBA • Led by your Teaching Fellow • Driven almost entirely by student questions and needs CSCI E-70 Lecture 1 / Bromberg

  4. Additional Help • Web Site • http://www.fas.harvard.edu/~libe70/current • Check constantly for updates, hints, notes • Please read entire syllabus – many important details • Ultimate Bulletin Board • Group technical discussions • Moderated by staff – both TFs and I contribute • E-mail TFs with private questions, grading issues • Attend regular TF office hours • Possibly schedule additional if need more help • Contact instructor • course policy questions – general concerns & complaints • office hours by appointment • Come to us one way or another; don’t sink or disappear CSCI E-70 Lecture 1 / Bromberg

  5. Workload • 1st half: 5-6 problem sets: 40% • Exercises. short programs, practice “project” • Mid-game summary: Midterm Exam: 15% • Keep you on-target; gauge individual mastery • root out technical weaknesses before final project • SPRING BREAK! • 2nd half: The Final Project (approx. 5 weeks) 45% • 3 stages (progessive building blocks) • Proposal (2-3 pages) • Design charts & Class skeletons (5-8 pages) • Final package (code + documentation, 15-30 pages) CSCI E-70 Lecture 1 / Bromberg

  6. Books & References Required: Graphic Java 2, Volume 2: Swing (3rd Edition)by David M. Geary: Prentice Hall PTR; ISBN: 0130796670; 3rd edition (March 12, 1999) Java Event Handlingby Grant Palmer: Prentice Hall PTR; ISBN: 0130418021; Bk&Cd-Rom edition (August 8, 2001) Recommended: Java 2D API Graphicsby Vincent J. Hardy: Prentice Hall PTR; ISBN: 0130142662; 1st edition (November 3, 1999) (Especially if you think final project will involve drawing) Others:see “recommended reading” handout Topley: Advanced text & document formatting Zukowswi: Extra JBuilder practice Robinson et al.: Practical GUImiddleware Walrath et al.: Printed Sun tutorial Lewis et al.: Multithreaded applications CSCI E-70 Lecture 1 / Bromberg

  7. Prerequisites • Enjoy using a GUI; no GUI programming needed • Data Structures experience: beyond int x; float y;... • one-dimensional arrays and loops should be “old hat” • understand tables, trees, and graphs in order to apply them • Fine to use library classes: java.util.Collection et al. • Java/OO experience: beyond one big main()... • Declaring base classes, derived classes • Polymorphism (just another Big Word?) • Formal vs. actual data types are different but “compatible” • Reference semantics of objects • Passing an Object as a parameter sends a reference to receiver • Notion of “incomplete” classes • pure functional: interfaces • mixed implementation/functional: abstract classes • Don’t panic – we’re here to practice all of this! CSCI E-70 Lecture 1 / Bromberg

  8. Submitting Work • Use the ‘submit’ facility on Harvard Unix system • personal workstation, fas.harvard.edu, ice.harvard.edu • NO other method will be accepted! (no paper) • man submit(1): see examples; course is cscie70 • Late penalty of 5% per day including weekends • However: 8 free late days. Entirely self-budgeted. • Intended for occasional “soft” extension – water pipe burst – kid ate your homework – got sick – snow storm – disk crashed • It will happen • MAKE BACKUPS EVERY DAY PLEASE! • Therefore any other extension only for medical emergencies • Deadlines fall on Friday just before midnight • Gives you time to mull over Wednesday’s section CSCI E-70 Lecture 1 / Bromberg

  9. Getting Started with Development • By next class, be able to run Java 2 SDK 1.4 • Edit, compile, test Java/Swing programs • By 3rd class, need JBuilder environment • Will be installed in 53 Church St. • Personal Edition 8 is free download • Establish work environment now • at Harvard, work, home, laptop, or combination • See HASCS guide off of www.fas.harvard.edu • Will distribute CD next week • Online book, JDK 1.4 JavaDoc, JBuilder, readings, code Stop for Questions CSCI E-70 Lecture 1 / Bromberg

  10. Submission Standards • Clean code • Header comments: name, date, purpose, implementation notes • Thoughtfully chosen variable, constant, and class names • Consistent indentation and spacing style • Comments describing inputs, outputs, errors, and “side effects” of every major function • Evidence of testing • Show graceful error handling & non-trivial, valid inputs • Often means 2-3 well-chosen screendumps of a GUI in action • Accompanying documentation as requested • Projects: UML diagram, user manual, architectural overview... • Standards will become stricter as we provide feedback • Try your best for now; focus on clean code CSCI E-70 Lecture 1 / Bromberg

  11. Java: my take • Best widely available OO language I know of • Far from perfect • too “safe”? bounds checking slows performance • too compromised by C legacy? primitive vs. object dichotomy • Fought over by Micro$oft • Court ordered re-integration to Windows • But C# is an up-and-comer? Will .NET dominate? • Industry battles: I shrug it off • Java not independently standardized (like C) • May not last forever • As a developer, be flexible and switch when the time comes • Learn good Object Oriented programming • applicable from C through Python to Java and beyond! CSCI E-70 Lecture 1 / Bromberg

  12. Let’s Swing! • AWT/Swing libaries are a monstrous hairy beast • Fear not for ye shall wrestle them to the ground • Explain architecture on-demand for now • Get your feet wet • Tie code to visuals • Let’s put up a window • import: the GUI packages • JFrame et al.: “Heavyweight” components • contentPane: access to body area • BorderLayout: basic component layout manager • JButton: interactive control • ActionListener / ActionEvent: event handling CSCI E-70 Lecture 1 / Bromberg

  13. standard windows decoration & titlebar; inside controlled by pure Java renderers start Visual States pressed inside hilights released outside un-hilights • Note dotted outline; means • component has focus • can use space bar to fire • more on focus later resizable unless specified otherwise. centered component grows to fill bounds released inside text changes; msgs printed pressed inside hilights released outside un-hilights released inside un-hilights; msgs printed CSCI E-70 Lecture 1 / Bromberg

  14. State Machines a b • In essence • Stripped-down history of program’s execution • Only what you need to react correctly to future events • Theoretical basis of the “data models” I will be rambling about • Big Stuff • Underlies Computer Science and Computer Engineering at all levels • Practical and efficient once discipline learned • Ideally suited for processing unpredictable input over long periods • Forces understanding of the problem you’re solving CSCI E-70 Lecture 1 / Bromberg

  15. Follow-up Review and additional detail: http://java.sun.com/docs/books/tutorial/uiswing/start/index.html especially .../start/swingTour.html Problem Set 1: • Student Survey due at end of class • Programming due Friday Feb 7 11:59:59.999... • Install J2SE SDK v1.4 • Make program modifications • Turn in screen dump, code listing • Turn in modified state diagram • Answer questions to exercises • Submit package to cscie70 library account on FAS Unix system Stop for Questions CSCI E-70 Lecture 1 / Bromberg

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