Remerciez-le!

Remerciez @Admin pour avoir partagé cet document gratuitement, de la manière la plus simple, en partageant sur les réseaux sociaux.

Guide 2023 05 30T084112 133

Java Software Solutions Chapter Computer Systems CBasic Computer Processing ? A computer system is made up of hardware and software ? Hardware Chips keyboards disks etc ? Software Programs and the data those programs use ? Key Components of a Computer System ? central processing unit CPU ? input output I O devices ? main memory ? secondary memory devices CMemory ? Programs and data are held in storage devices called memory which fall into two categories ? Main Memory ? The storage device e g chips on the mother board that holds the programs and their data software while the programs are executing ? Secondary Memory ? Devices such as hard disks that store software in a relatively permanent manner ? We save our software on secondary memory Copies of the software are brought into main memory when we execute our programs CSoftware Categories ? We will be concerned with two categories of software ? The operating system ? Provides a user interface that allows us to interact with the machine enter input and view output ? Manages computer resources such as the CPU and main memory ? Application Software ? Generic term for just about any software other than the operating system ? Word processors web browsers games business applications etc ? The focus of this course is development of highquality application programs CWhat This Means to Us ? We will be learning to create application programs using the Java programming language ? We will be using an IDE called NetBeans ? Current version of NetBeans is but and should both be su ?cient also ? IDE stands for Integrated Development Environment Know this CMore What this means to us ? You will dowload the J SE Standard Edition and Development Kit JDK from Sun Microsystems ? You will also download Netbeans and install it ? See separate link for tutorial on this CAnalog versus Digital Signals ? Analog information and or signals are continuous varying in direct proportion to the source of the information ?? like the amplitude of a wave may vary with volume It ? s period may vary with frequency ? ? Digital technology breaks information into discrete pieces and represents the pieces as numbers ? Music on a CD is stored digitally as a series of numbers The music is sampled about times per second and each number represents the voltage level of one speci ?c instance of the recording CAn Analog Signal versus a Digital Signal analog digital CBinary Numbers ? A digital computer stores information as numbers but those numbers are not stored as decimal numbers ? All information in a computer is stored and managed as binary values ? The binary number system has only two digits and ? A single binary digit is called a bit CConverting Binary Numbers to Decimal Numbers ? Starting with the rightmost bit in a binary number each position represents a power of with the rightmost bit position representing which is decimal the next