Lecture 1 Introduction Today s topics 1 Course information 2 Computer basics 8 30 2006 CMSC 131 Fall 2006 Rance Cleaveland 2006 Univeristy of Maryland CMSC 131 Section 03 Name Object Oriented Programming I Instructor Rance Cleaveland Lab leader Matt Mah Class meetings Lecture MWF 3 3 50 CSIC 3117 Lab sections CSIC 2107 0301 MW 1 1 50 0302 MW 2 2 50 CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 1 Coordination with Other Sections Two other sections of CMSC 131 both taught by Fawzi Emad All sections will be closely coordinated Same lecture material on same day Same projects Same labs Coordinated exams CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 2 What Is This Course A fast paced introduction to techniques for writing computer programs There will be a lot of work Keys to success Attend all classes and lab sections Ask questions Start assignments early Get help early if you are having trouble Study every day Check announcements on course web page every day CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 3 Course Web Page www cs umd edu class fall2006 cmsc131 Check daily Review Announcements Syllabus Contact Schedule Lecture slides CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 4 Book Java Software Solutions Foundations of Program Design 5th edition by Lewis Loftus Lectures do not follow book closely Book is very useful reference CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 5 Course Software Eclipse An IDE interactive development environment You will use it for writing Java programs Access to Eclipse it s free You can install it on your own machine http www cs umd edu eclipse Also accessible in Workstations at Maryland WAM labs around campus http www wam umd edu CVS Concurrent Versions System A version management system You will use it for submitting your projects We will talk more about this later CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 6 Study Questions Available on web page Login study Password daily Look at them on evenings before class they will help you keep up CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 7 Computer Organization Hardware physical parts of computer Monitor mouse keyboard Chips boards Cables cards etc Software non physical logical parts of computer Programs instructions for computer to perform CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 8 Hardware Overview CPU central processing unit Main memory random access memory RAM Stores data that can be loaded into main memory SLOWER but permanent I O devices Stores data that CPU accesses including instructions FAST but temporary wiped out when computer is shut off Secondary memory Hard disks CDs DVDs flash memory etc Executes the instructions in programs How you communicate with your machine Keyboard monitor mouse speakers etc Networking equipment How others communicate with your machine Networking cards cables etc CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 9 Main Memory Computer data consists of 0 s and 1 s really A cell in main memory that can hold either a 0 or 1 bit A sequence of 8 bits byte A sequence of 4 bytes word Main memory table of bytes indexed by addresses Address Byte value CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 1 1 0 0 1 1 1 0 1 2 0 0 0 1 1 0 0 1 3 1 1 1 1 1 1 0 1 4 1 1 0 0 0 1 0 0 10 How Many Different Values in a Bit 2 Two bits 4 2x2 Byte 256 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 28 Word 4 294 967 296 232 CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 11 How Are Characters Etc Represented Via encoding schemes Example ASCII American Standard Code for Information Interchange Standard for encoding character values as bytes In ASCII A 01000001 a 01100001 00101100 etc There are other character encoding schemes also Shift J Unicode etc CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 12 Other Standard Terminology 1 KB 1 kilobyte 210 bytes 1 024 bytes 1 MB 1 megabyte 210 KB 1 024 KB 1 GB 1 gigabyte 210 MB 1 024 MB CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 13 Software Overview 1 Operating system manages computer s resources typically runs as soon as computer is turned on Typical responsibilities 2 Process management Determines when how programs will run on CPU time Memory management Controls access to main I O window system network control Performs low level drawing communication operations Security Manages user IDs passwords file protections etc Applications programs users interact directly with usually are explicitly run Examples Word processors Games Spreadsheets Music software Etc CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland 14 How Programs Are Executed foo exe Program foo initially stored in secondary storage COPY CPU Program copied into main memory CMSC 131 Fall 2006 Rance Cleaveland 2006 University of Maryland CPU executes program instructionby instruction 15
View Full Document
Unlocking...