.net upc-a reader

.net upc-a reader

.net upc-a reader

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return true;

All that remains is to write the + method We pass the number of the record we want to display to this method, and it displays the record's <FIRSTNAME> and <LASTNAME> data[md]called the record's fields[md]in the two text fields We will write this method now We start the + method by getting the XML document's root element (here, d is the document variable; we've made that variable global so that we can reach it in different methods throughout the applet class): void showRecord(int recordNumber)

Element root = dgetRoot();

Next, we get an enumeration of the root's children, which are the records in the database: void showRecord(int recordNumber)

<xs:element name="firstname"> <xs:simpleType> <xs:restriction base="xs:string"> <xs:maxLength value="30"/> </xs:restriction> </xs:simpleType> </xs:element>

Element root = dgetRoot();

Just be sure that you don t get discouraged and offer more than you should for a property Once you make your calculations, don t redo them upward because a seller won t budge Stick with them Better to lose a deal than to get stuck by paying too much and not being able to x it up to a market price Don t get discouraged Lots of people nd, buy, and successfully x up properties every day There s no good reason you can t be one of them

Enumeration enum = rootgetChildren();

Now we can simply loop through the database until we come to the correct record: void showRecord(int recordNumber)

Element root = dgetRoot();

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Element elem = null, elem2 = null;

Enumeration enum = rootgetChildren();

for(int index = 0; index <= recordNumber; index++){

elem = (Element)enumnextElement();

At this point, the + element holds the record we want; if we wanted record number 1, we'd be pointing at this data: < XML version = "10" >

<!DOCTYPE DOCUMENT [

Classes are to objects as cookie cutters are to cookies That is, a class is an object's type, much as an integer named + this way in Java: dataClass dataObject; <--

Note: Like C or C++, you end lines of code in Java with a semicolon, ;

To actually create that new object, dataObject, we use the Java new operator this way (we'll see more about this process later in this chapter): dataClass dataObject;

dataObject = new dataClass();

Now that the dataObject object has been created, we are free to use the getData() function in that object like this: dataClass dataObject;

dataObject = new dataClass();

Besides setting the maximum length, you can also set a minimum length for an element or fix its length to a specific number of characters You set the minimum length by using the xs:minLength tag, and set the fixed length by using the xs:length tag Both of these are illustrated here Each is placed within the xs:restriction tag

dataObjectgetData();

An object's built-in functions are called its member methods, just as its built-in data (stored in variables, data structures, or other, internal, objects) is referred to as member data You reach member data just as you reach member methods: if dataObject has a public data member named, say, dataInteger, we can reach that in Java this way: dataClass dataObject;

dataObject = new dataClass();

dataObjectgetData();

dataObjectdataInteger = 0;

That completes our overview of classes and objects The best way to learn about these programming concepts is to see them at work, so now that we have some of the terminology down, let's return to our Java example, +

This is what our file helloappjava looks like so far: public class helloapp {

Here we're declaring a class named helloapp and making it public When we make this class public, Java will create a class file named +, and it is this class file that we'll actually run to see our program work When we run it, Java will create an object of this class and give it control, as we'll see

Now we've declared the new class we need, but how do we make it do anything It turns out that there is a special method in Java applications named the + method, and when you run a Java application, Java runs this method first The next step, then, is to add that method to our program

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