Overview of Computers

1. Overview of Computers • How have computers changed? • How have the way we use computers changed? • Terms • World wide web • Computer chip • Time sharing

2. Computer Categories • Microcomputers • Minicomputers • Mainframe computers • Supercomputers

3. Computer Components • Hardware • Software • Programs

4. Computer Components • Memory • Main • Secondary • Store-program concept • CPU • Input • Output • Network Connection

5. Main Memory • Memory cells • Address • Byte • Bit • RAM (volatile) • ROM (boot)

6. Secondary Memory • Disk drive • Floppy • Hard disk • CD-ROM • USB/Flash Drive • Others?? • Files

7. CPU • Coordinate functions • Perform math and logic • Fetching instruction

8. Input/Output • Keyboard/Monitor • Function Keys • Cursor • Mouse • Icon • Printer • Others?

9. Computer Networks • LAN • Server • Internet • Digital versus Analog • File servers • Client/server • Peer-to-peer

10. World Wide Web • Links • Web browser • Platform independence!!! • Multimedia • Applets

11. 1.3 Computer Software • Operating System • Booting computer Page 13 • Application Software

12. Programming Languages • Machine language • Assembly Language • High Level Language

13. Object Oriented Programming • Object • State • Behavior • Methods • Behavior • Class • Properties/attributes

14. Processing High-Level Language programs • Source code • Object code • Compiler

15. Java Is Different • Source code • Byte code • Java Virtual Machine (JVM Interpreter • Applet (where stored??) • Application

16. Problem solving and classes • Plan First, before typing!!!(also, budget time for the unexpected) • Plan for classes (pg 21) • Problem, Analysis, Design, Implement, Test, Maintain • Plan for reuse • Desk check solution • Document!

17. Case Study • Problem • Analysis • Design • Implementation • Testing • Maintenance

18. NameInStars public class NameInStars { private String name; public NameInStars(String nam) { name = nam; } public String surroundNameInStars() { return "*****" + name + "*****\n" + "*****" + name + "*****\n" + "*****" + name + "*****"; } }

19. ShowNameInStars import javax.swing.*; public class ShowNameInStars { public static void main(String[] args) { // Get the user's name String userName = JOptionPane.showInputDialog("Enter your name"); // Create a NameInStars object that stores the user's name. NameInStars you = new NameInStars(userName); // Display your name in stars three times JOptionPane.showMessageDialog(null, you.surroundNameInStars()); } }

20. Ethics • Privacy and data misuse • Programmers get access to large amounts of data • Using the data for any purpose than is intended is fraud or theft

21. Hacking • Entering anyone’s computer without permission is illegal, just as entering a persons home without permission is illegal. • Viruses are an incredible drain on our economy.

22. Piracy and plagiarism • Having software that you have not properly licensed on your computer is illegal. • In your professional world you must make sure that your organization is 100% legal. • Plagiarism we have discussed

23. Misuse of resources • Protect your access to the network. • Only use the network for it’s intended purposes. • Mass Emails can be a drain on network resources and offending to other individuals.

24. Miscellaneous • Computer resources belong to the company. • Company Email can legally be monitored • It can be subpoenaed for court • Don’t say anything in an Email that you would not want to see posted on an internet site.