University:
California State University, Northridge
Course:
COMP 333 | Concepts of Programming Languages
Academic year:

2021
Views:

445

Pages:

10
Author:

rezancuk2j

STARTING OUT WITH JAVATM 7th Edition Chapter 1 Introduction to Computers and Java Chapter Topics Chapter 1 discusses the following main topics: – – – – – – – Introduction Why Program? Computer Systems: Hardware and Software Programming Languages What Is a Program Made Of? The Programming Process Object-Oriented Programming Java History • 1991 - Green Team started by Sun Microsystems (now owned by Oracle). • *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. Introduction • Java enabled web browser (HotJava) demonstrated at 1995 Sun World conference. • Java incorporated into Netscape shortly after. • Java is “cross platform”, meaning that it can run on various computer operating systems. Java Applications and Applets • 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 applications that require the use of a Java enabled web browser to run. ▪ Enhanced security model since the user merely goes to a web page and the applet runs itself. Why Program? (1 of 3) • Computers are tools that can be programmed to perform many functions, such as: • spreadsheets • databases • word processing • games • etc. • Computers are versatile because they can be programmed. • Computer Programmers implement programs that perform these functions. Why Program? (2 of 3) 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. Why Program? (3 of 3) • 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, and redesign. • Programming languages have strict rules, known as syntax, that must be carefully followed. Computer Systems: Hardware (1 of 2) • Computer hardware components are the physical pieces of the computer. • The major hardware components of a computer are: – – – – The central processing unit (CPU) Main memory Secondary storage devices Input and Output devices Computer Systems: Hardware (2 of 2)