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Introduction

Introduction CS 101 Instructors Jim Cohoon Office Olsson 221 Hours: Monday 3:30 – 5:00, Tuesday 10:00 – 11:00 Email id: Aaron Bloomfield Office Olsson 228D Hours: Monday 1:00 – 2:00, Wednesday 10:00 = 11:00, Friday 10:00 – 11:00 Email: Both instructors also accept appointment

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Introduction

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  1. Introduction

  2. CS 101 • Instructors • Jim Cohoon • Office • Olsson 221 • Hours: Monday 3:30 – 5:00, Tuesday 10:00 – 11:00 • Email id: • Aaron Bloomfield • Office • Olsson 228D • Hours: Monday 1:00 – 2:00, Wednesday 10:00 = 11:00, Friday 10:00 – 11:00 • Email: • Both instructors also accept appointment

  3. Objectives • Provide opportunities for the demonstration of student comprehension through lab demonstrations, tests, and homework projects • Provide a variety of learning experiences to instill familiarity with the fundamentals of computing systems and software development

  4. Objectives • Provide opportunities for the demonstration of student comprehension through lab demonstrations, tests, and homework projects • Provide a variety of learning experiences to instill familiarity with the fundamentals of computing systems and software development • Understand common fundamentals of programming • Understand fundamentals of object-oriented programming in Java • Appreciate importance of software engineering and Computer Science • Develop programs to solve specified problems. • Use the Java SDK environment to create, debug and run simple Java programs

  5. Prerequsites • Genuine interest in learning the material • Agree to abide by the course honor policy

  6. Honor policy • When there is doubt regarding what is allowable or honorable, you will ask before doing it • When possible with honor, you will help your classmates learn and improve • You will seek honorable help before succumbing to frustration • You will pledge your work that you have neither given nor received unauthorized help • You will not describe or show problems to anyone who has not yet completed a quiz or exam • You will not receive information on problems before completing a quiz or exam • By default, collaboration is limited to the discussion of ideas • Code is not distributed either electronically or on paper • Any exceptions will be specifically noted on an assignment

  7. Honor policy • Academic irregularities may result in failure of the course and be brought to the honor committee • Beware of MOSS

  8. Text • Java Program Design, McGraw-Hill, 2005, ISBN 0072948655. • Cohoon and Davidson

  9. Grading criteria • 5% – Laboratory participation • If you miss more than 2 labs, you are subject to course failure for the course • If for a valid reason you are unable to do your lab, there will be a make-up lab on Sunday night, provided that you get permission prior to your scheduled lab • 10% – Laboratory programming quizzes • 35% – Homework assignments • 25% – Midterms • September 29, October 27, November 22 • Your worst midterm will be weighted ½ of your other midterms • 25% – Final exam • Scheduled time is Monday December 13 at 7:00 PM • See other instructors for make-ups; i.e., APMA 310 and ECON 201 • Average grade will be at least a B-

  10. Grading criteria • Average grade will be at least a B-

  11. Home directory service • All assignments and lab files must be kept on your home directory • www.virginia.edu/homedir

  12. Sections • CS 101 • Students have little or no programming experience • Mandatory scheduled closed labs • CS 101E • Students with programming experience • Open labs that are to be completed by a scheduled time • All students take same quizzes and tests, and do the same assignments • Course curve is based on the section with the lower average

  13. Let’s begin • Goal • Teach you how to program effectively • Skills and information to be acquired • Mental model of computer and network behavior • Problem solving • Object-oriented design • Java

  14. Let’s begin • Goal • Teach you how to program effectively • Skills and information to be acquired • Mental model of computer and network behavior • Problem solving • Object-oriented design • Java

  15. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card

  16. Computer Organization

  17. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card 3.06 billion operationsper second

  18. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card 512 million bytes of memory that can betransferred at doublethe normal rate A byte is 8 bits A bit is a 0 or a 1

  19. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card Stores 200 billionbytes of data. You want high RPM andlow seek time.0.009 seconds isaverage

  20. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card 17” on the diagonal.Resolution up to1,280 by 1,024pixels

  21. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card Microprocessor fordisplaying images with64 million bytes ofmemory. More memorysupports more colorsand higher resolution

  22. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card Reads DVDs 16 timesfaster than a basic DVDdrive. Can hold up to8 billion bytes of data

  23. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card Can read and writeCDs. Can hold 650million bytes of dataReads at 48 timesfaster and writes24 times faster thana basic drive

  24. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card Can send or receiveup to 56 thousandbits per second

  25. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card Computer operatingsystem using agraphical interface

  26. Computer Organization • Computer advertisement specification • Intel® Pentium 4 Processorat 3.06GHz with 512K cache • 512MB DDR SDRAM • 200GB ATA-100 Hard Drive(7200 RPM, 9.0 ms seek time) • 17” LCD Monitor • 64MB NVIDIA GeForce4MX Graphics Card® • 16x Max DVD-ROM Drive • 48x/24x/48x CD-RW Drive • 56K PCI Telephony Modem • Windows XP Home Edition SP2 ® • 10/100 Fast Ethernet Network Card Can send or receivedata at two rates – 10 or 100 million bytesper second

  27. Problem Solving • Remember • The goal is not a clever solution but a correct solution

  28. Problem Solving • Accept • The process is iterative • In solving the problem increased understanding might require restarting

  29. Problem Solving • Solutions • Often require both concrete and abstract thinking • Teamwork

  30. Problem Solving Process • What is it? • Analysis • Design • Implementation • Testing

  31. Problem Solving Process • What is it? • Analysis • Design • Implementation • Testing • Determine the inputs, outputs, and other components of the problem • Description should be sufficiently specific to allow you to solve the problem

  32. Problem Solving Process • What is it? • Analysis • Design • Implementation • Testing • Describe the components and associated processes for solving the problem • Straightforward and flexible • Method – process • Object – component and associated methods

  33. Problem Solving Process • What is it? • Analysis • Design • Implementation • Testing • Develop solutions for the components and use those components to produce an overall solution • Straightforward and flexible

  34. Problem Solving Process • What is it? • Analysis • Design • Implementation • Testing Test the components individually and collectively

  35. Problem Solving Process

  36. Tips • Find out as much as you can • Reuse what has been done before • Expect future reuse • Break complex problems into subproblems

  37. Engineering software • Complexity of software grows as attempts are made to make it easier to use • Rise of wizards

  38. Software engineering • Goal • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable

  39. Software engineering • Goal • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable • Work correctly and not fail

  40. Software engineering • Goal • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable • Because of the long lifetime many people will be involved • Creation • Debugging • Maintenance • Enhancement • Two-thirds of the cost is typically beyond creation

  41. Software engineering • Goal • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable • Cost to develop and maintain should not exceed expected benefit

  42. Software engineering • Goal • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable • Design software so that new features and capabilities can be added

  43. Software engineering • Goal • Production of software that is effective and reliable, understandable, cost effective, adaptable, and reusable • Makes sense due to the great costs involved to have flexible components that can be used in other software

  44. Object-oriented design • Purpose • Promote thinking about software in a way that models the way we think and interact with the physical word • Object • Properties or attributes • Behaviors

  45. Object-oriented design • Class • Term for a type of software object • Object • An instance of a class with • specific properties andattributes

  46. Java and the Internet

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