Java Programming, 3eConcepts and Techniques

Chapter 1

Section 56 –

An Introduction to Java

2Chapter 1: An Introduction to Java and Program Design

Chapter Objectives

• Describe characteristics of Java

• Explain the uses of Java and identify types of Java programs

3Chapter 1: An Introduction to Java and Program Design

Introduction

• A program is a step-by-step series of instructions for a computer

• Computer programming is the process of writing these instructions

• Programmers, or developers, design and write programs using a programming language or development tool

• Java is a programming language that provides the structure for efficient and economical programs

4Chapter 1: An Introduction to Java and Program Design

What Is Java?

• High-level language

• Object-oriented– Data and operations are packaged into a

single unit called an object

• Basic syntax derived from C, C++, and Smalltalk– Designed by a team from Sun Microsystems

led by James Gosling in the early 1990’s

5Chapter 1: An Introduction to Java and Program Design

What Is Java?

• Parsimonious– Compatible with older versions

• Robust– Strongly typed and incorruptible data

• Secure– Protection against misuse of code

• Portable– Platform-independent

6Chapter 1: An Introduction to Java and Program Design

Java Program Types

• Console and Windowed applications

• Applets

• Servlets

• Web Services

• JavaBeans

7Chapter 1: An Introduction to Java and Program Design

Console Applications

• Stand-alone programs using a command-line interface

8Chapter 1: An Introduction to Java and Program Design

Windowed Applications

• Stand-alone programs using a graphical user interface (GUI)

9Chapter 1: An Introduction to Java and Program Design

Applets

• Client-side programs executed as part of a displayed Web page

10Chapter 1: An Introduction to Java and Program Design

Servlets

• Server-side programs hosted and run on a Web server

• Used in conjunction with Java Server Pages (JSP) to provide sophisticated server-side logic

• Enable connections to server databases through Java Database Connectivity (JDBC)

11Chapter 1: An Introduction to Java and Program Design

Servlets

12Chapter 1: An Introduction to Java and Program Design

Web Services

• Services receive information requests over the Web and return the requested data

13Chapter 1: An Introduction to Java and Program Design

JavaBeans• Reusable software components

14Chapter 1: An Introduction to Java and Program Design

Summary

• Java is a high-level object oriented programming language– Has Objects, Methods, Functions,

Parameters!– Uses conditional statements, loops, etc

• There are different Java Program Types but the underlying code is all JAVA and very similar.

15Chapter 1: An Introduction to Java and Program Design

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