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To interpret XML documents, we'll parse them (that is, dissect them into their logical structure) There are a number of XML parsers available that we can work with Parsing an XML document breaks it up into its component elements Then, however, it will be up to us to make sense of the result, because only we know what we want to do with the data in the <CUSTOMER> or <ORDERS> tags Almost all XML parsers are written in Java these days, which means we'll use a lot of Java in this book XML parsers come as prewritten Java code that we can place right into our applications We'll make use of that code in our programs to read in XML documents and determine their structure In the rest of this chapter, then, we'll come up to speed in Java, getting familiar with[md]or, if you already know Java, reviewing[md]the code we'll need to make XML parsers work Then we'll be able to write programs in Java that load, parse, and process (ie, display, interpret, analyze as indicated by the document's content) XML documents

Note: If you're familiar with Java and the topics in this chapter, feel free to skip on to 2, "Working with XML"

Let's start now with Java, working through the Java we'll need for the rest of the book in this chapter In the next chapter, we'll start parsing and making use of actual XML documents Here, we'll use Java 102, the version that is the most widely used today (in practice, you can use any Java version, of course, but here we'll use Version 102) To make use of the code in this book (and virtually every XML parser), then, make sure you have Java installed on your computer You can download the Java Development Kit (JDK) from the Java Web site, http://wwwjavasoftcom; to install Java, follow the instructions that come with the JDK

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Our first Java application will be a very simply one, only printing the greeting: "Hello" This will get us started in Java, creating the type of Java applications we'll use throughout the book, so let's take a

look at how this works now In the next chapter, we'll see how to connect XML parsers to our Java applications Learning Java is fundamental to working with XML today, because almost all XML software uses Java, and you need to use Java to use that software XML is designed for the Web, and Java is the most popular programming language used on the Web We'll be using Java in all the chapters in this book (except 9 on XML stylesheets) This first Java application will only print the greeting "Hello", so we'll call it helloapp Using a text editor or word processor (if you use a word processor, make sure you store Java programs in plain text format, without any special formatting characters), create the file + Note that a Java file's extension must be java; if your editor can't create documents with that extension, save the file with the extension jav and rename it later, giving it the extension java To start, place this text in helloappjava: public class helloapp {

Here we declare the new Java class + And that brings us to the first question: what's a class To answer that question, we will quickly overview object-oriented programming

OOP (Object-oriented programming) was originally invented to deal with larger programs, and it provided the programmer with a way of encapsulating code and data into easily conceptualized bundles called objects This cleared the program's general workspace of many unrelated data items

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