我应该如何在java类中存储xml数据？

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.File;

public class XMLStorageExample {
    public static void main(String[] args) {
        try {
            // 加载XML文件
            File xmlFile = new File("data.xml");
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(xmlFile);

            // 获取根节点
            Element root = document.getDocumentElement();

            // 获取子节点列表
            NodeList nodeList = root.getElementsByTagName("item");

            // 遍历子节点并存储数据
            for (int i = 0; i < nodeList.getLength(); i++) {
                Element item = (Element) nodeList.item(i);
                String id = item.getAttribute("id");
                String name = item.getElementsByTagName("name").item(0).getTextContent();
                String value = item.getElementsByTagName("value").item(0).getTextContent();

                // 在这里可以将数据存储在Java类中的变量中，或者进行其他操作
                System.out.println("ID: " + id);
                System.out.println("Name: " + name);
                System.out.println("Value: " + value);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}