Textbook Notes (367,876)
United States (205,907)
CS 0007 (10)
Chapter 1

Chapter 1 Lecture Notes (Intro to Java)

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Department
Computer Science
Course
CS 0007
Professor
Karen Bigrigg
Semester
Summer

Description
Chapter 1: Intro to Computers and Java Starting out with Java: From Control Structures through Objects History (not that important) -1991 Green Team started by Sun Microsystems -7 handheld controller for multiple entertainment systems -There was a need for a programming language that would run on various devices -Java (first named Oak) was developed for this purpose Intro -Java enabled web browser (HotJava) -Java incorporated into Netscape shortly after -Java is “cross platform” meaning it can run on many systems Java programs can be of two types: -Applications --Stand-alone programs that run without the aid of a web browser --Relaxed security model since the user runs the program locally -Applets --Small application that require the use of a Java enabled web browser to run --Enhanced security mode since the user merely goes to a web page and the applet runs itself Why Program? -Computers are tools that can be programmed to perform many functions, such as: --spreadsheet/games/databases/word processing/ect -Computers are versatile because they can be programmed -Computer programmers implement programs that perform these functions Aspects of a computer program that must be designed: -The logical flow of the instructions -The mathematical procedures -The layout of the programming statements -The appearance of the screens -The way information is presented to the user -The program’s “user friendliness” -Manuals, help systems, and/or other forms of written documentation -Programs must be analytically correct as well -Programs rarely work the first time they are programmed -Programmers must perform the following on a continual basis --Analyze --Experiment --Correct --Redesign -Programming languages follow strict rules, so correct syntax is important Computer Systems: Hardware -Computer hardware components are the physical pieces of the computer -The major hardware components of a computer are --The CPU (central Processing unit --Main memory (RAM) --Secondary storage devices --Input and Output (USB is I/O, input and output) The CPU performs the fetch. Decode, execute cycle in order to process program info Main Memory (RAM or random-access memory) -RAM contains: currently running programs/data used by those programs -RAM is divided into units called bytes -A byte consists of eight bits that may be either on (1) or off (0) -The bits form a pattern that represents a character or a number -Each byte in a memory is assigned a unique number known as an address -RAM is volatile, which means that when the computer is turned off, the contents are erased Secondary Storage Devices -Secondary storage is non-volatile, so when the power is turned off, memory stays **I/O devices do both input and output Software -Software refers to the programs that run on a computer -Two classifications: --Operating Systems
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