JAXB (JAVA ARCHITECTURE FOR XML BINDING)

java objects are created to and from XML.the different annotations will be described in the program below.
1)Book.java(a class with getter setter methods)

XmlRootElement(name = "book")
// If you want you can define the order in which the fields are written
// Optional
@XmlType(propOrder = {"name", "id"})  //the order of output in XML.
public class Book {

    String name;
    int id;
    // If you like the variable name, e.g. "name", you can easily change this
    // name for your XML-Output:

    @XmlElement(name = "bookName")//will see the change when u see the XML as output
2)BookStore.java(a class with an arraylist and getter setter methods)

//This statement means that class "Bookstore.java" is the root-element of our example
@XmlRootElement(namespace = "jaxb implementation")//when u say namespace that means root element of XML.
public class BookStore {
// XmLElementWrapper generates a wrapper element around XML representation

    @XmlElementWrapper(name = "bookList")
    // XmlElement sets the name of the entities
    @XmlElement(name = "book")
    private ArrayList<Book> bookList;
    private String name;
    private String location;
3)BookMain.java the main class
set the values and include the book class object in the arraylist.also .
class x{
private static final String BOOKSTORE_XML = "./bookstore-jaxb.xml";
public static void main(){

// create JAXB context and instantiate marshaller
        JAXBContext context = JAXBContext.newInstance(BookStore.class);
        Marshaller m = context.createMarshaller();
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        m.marshal(bookstore, System.out);

        Writer w = null;
        try {
            w = new FileWriter(BOOKSTORE_XML);
            m.marshal(bookstore, w);
        } finally {
            try {
                w.close();
            } catch (Exception e) {
            }
            // get variables from our xml file, created before
            System.out.println();
            System.out.println("Output from our XML File: ");
            Unmarshaller um = context.createUnmarshaller();
     
          BookStore bookstore2 =  (BookStore) um.unmarshal(new FileReader(
                    BOOKSTORE_XML));

           for (int i = 0; i < bookstore2.getBooksList().toArray().length; i++) {
                System.out.println("Book " + (i + 1) + ": "
                      +"id:"  + bookstore2.getBooksList().get(i).getId()+ " "
                     +"author"+":"+ bookstore2.getBooksList().get(i).getName()+"location"+":"+bookstore2.getLocation());
            }

        }
    }
output:-

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:bookStore xmlns:ns2="jaxb implementation">//see the rootelement
    <bookList>
        <book>
            <name>sougata</name>
            <bookName>6974</bookName>//see the name change"bookname"
        </book>
    </bookList>
    <location>Frankfurt Airport</location>
    <name>Fraport Bookstore</name>
</ns2:bookStore>

Output from our XML File:
Book 1: id:6974 author:sougata location:Frankfurt Airport