Reading multiple xml documents objects from xml file by using JAXB

Album

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

/**
 *
 * @author Rivet Systems
 */
@XmlRootElement(name = "album")
@XmlAccessorType(XmlAccessType.FIELD)
public class Album {

    @XmlElement(name = "title")
    String title;
    @XmlElement(name = "url")
    String url;
    @XmlAttribute(name = "id")
    String id;
    @XmlAttribute(name = "group")
    String group;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getGroup() {
        return group;
    }

    public void setGroup(String group) {
        this.group = group;
    }

   

   
}

Files

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlList;
import javax.xml.bind.annotation.XmlRootElement;

/**
 *
 * @author Rivet Systems
 */
@XmlRootElement(name = "albums")
@XmlAccessorType (XmlAccessType.FIELD)
public class Files {
    
    @XmlElement(name = "album")
    List<Album> albums = new ArrayList<Album>();

    public List<Album> getAlbums() {
        return albums;
    }

    public void setAlbums(List<Album> albums) {
        this.albums = albums;
    }

}

files

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<albums>
    <album id="100" group="false">
        <title>title1</title>
        <url>url1</url>
    </album>
    
    <album id="101" group="true">
        <title>title2</title>
        <url>url2</url>
    </album>
    
    <album id="102" group="true">
        <title>title3</title>
        <url>url3</url>
    </album>
    
    <album id="103" group="false">
        <title>title4</title>
        <url>url4</url>
    </album>
</albums>

ReadXml

import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

/**
 *
 * @author Rivet Systems
 */

public class ReadXml {
     public static void main(String[] args) {

        try {

            File file = new File("files.xml");
            JAXBContext jaxbContext = JAXBContext.newInstance(Files.class);
            Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
            Files Files = (Files) jaxbUnmarshaller.unmarshal(file);
            System.out.println("Files :"+Files);
            for(Album album : Files.getAlbums()){
                System.out.println("Id : "+album.getId());
                System.out.println("Group : "+album.getGroup());
                System.out.println("Title : "+album.getTitle());
                System.out.println("getUrl : "+album.getUrl());
            }

        } catch (JAXBException e) {
            e.printStackTrace();
        }

    }
}

How to write all this contents to an XML file?