Overview of Computers How have computers changed? How have the way we use

computers changed? Terms

World wide web Computer chip Time sharing

Computer Categories Microcomputers Minicomputers Mainframe computers Supercomputers

Computer Components Hardware Software Programs

Computer Components Memory

Main Secondary Store-program concept

CPU Input Output Network Connection

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

Secondary Memory Disk drive

Floppy Hard disk CD-ROM USB/Flash Drive Others??

Files

CPU Coordinate functions Perform math and logic Fetching instruction

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

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

World Wide Web Links Web browser Platform independence!!! Multimedia Applets

1.3 Computer Software Operating System Booting computer Page 13 Application Software

Programming Languages Machine language Assembly Language High Level Language

Object Oriented Programming Object

State Behavior

Methods Behavior

Class Properties/attributes

Processing High-Level Language programs Source code Object code Compiler

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

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!

Case Study Problem Analysis Design Implementation Testing Maintenance

NameInStarspublic class NameInStars { private String name;

public NameInStars(String nam) { name = nam; }

public String surroundNameInStars() { return "*****" + name + "*****\n" + "*****" + name + "*****\n" + "*****" + name + "*****"; }}

ShowNameInStarsimport 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()); }}

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

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.

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

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.

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.