Java课件_LESSON 1 - An Introduction to Java.pptVIP

Java Programming LanguageLESSON 1 – An Introduction to Java 吴砥 wudi@ Department of Electronics Information Engineering, Huazhong University of Science Technology, Wuhan, Hubei, P.R.C. /ELWG/index.xml Outline Java’s past, present and future What is Java Java’s features The program types of Java Development tools The first Java program Java vs. other languages Summary Java’s Past, Present and Future Computer Organization Input unit Mouse, keyboard Output unit Monitor, printer, audio speakers Memory unit RAM Arithmetic and logic unit (ALU) Performs calculations Central processing unit (CPU) Supervises operation of other devices Secondary memory unit Hard drives, floppy drives Programming languages Machine language “Natural language” of computer component Machine dependent Assembly language English-like abbreviations represent computer operations Translator programs convert to machine language High-level language “English-like” instructions Compiler convert to machine language Some representative languages Structural programming language FORTRAN (IBM Mathematical FORmula TRANslation) BASIC (Beginner‘s All Purpose Symbolic Instruction Code) COBOL (Common Business Oriented Language) PASCAL C Object-Oriented programming language C# (C Sharp) C++ Object Pascal Java SmallTalk Ada Who develops Java? The Java language was developed at Sun Microsystems in 1991 as part of a research project to develop software for consumer electronics devices. Java’s creator Java is a programming language and enviroment whose original name was Oak and developed as a part of the Green project at Sun started by James Gosling. Java’s initial goal Java’s goals at that time were to be small, fast, efficient, and easily portable to a wide range of hardware devices. It is those same goals that made Java an ideal language for distributing executable programs via the World Wide Web. “Write once, run anywhere!” Java’s future Enterprise information system Mobile application Distributed computing