[院校资料]java双语课程第一章.pptVIP

Liang, Introduction to Java Programming, Sixth Edition, (c) 2007 Pearson Education, Inc. All rights reserved. 0-13-222158-6 Part 1 Fundamentals of Programming Chapter 1 Introduction to Computers, Programs, and Java Objectives To review computer basics, programs, and operating systems (§1.2-1.4). To understand the relationship between Java and the World Wide Web (§1.6). To distinguish the terms API, IDE, and JDK (§1.7). To write a simple Java program(§1.8). To create, compile, and run Java programs(§1.9). To know the basic syntax of a Java program(§1.10). To display output in a dialog box(§1.11). 1.1 Introduction Why Java? Java is the Internet programming language used to develop applications on the Internet for servers, desktop computers, and small hand-held devices. Basic preparative knowledge 1.2 What is a Computer? CPU Memory How Data is Stored? Data of various kinds, such as numbers, characters, and strings, are encoded as a series of bits (zeros and ones). Computers use zeros and ones because digital devices have two stable states, which are referred to as zero and one. The programmers need not to be concerned about the encoding and decoding of data, which is performed automatically by the system based on the encoding scheme. The encoding scheme varies, such as ASCII, Unicode. If computer needs to store a large number that cannot fit into a single byte, it uses a number of adjacent bytes. A byte is the minimum storage unit. Storage Devices Output Devices: Monitor Communication Devices 1.3 Programs Computer programs, known as software, are instructions to the computer. Computers do not understand human languages, so you need to use computer languages to communicate with them. You tell a computer what to do through programs. Programs are written using programming languages. Programming Languages Machine Language Assembly Language High-Level Language Programming Languages Machine Language Assembly Language High-Level Language Programming L