Bagaimanakah Saya Boleh Mencantikkan Rentetan XML di Java?

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

public class XmlBeautifier {

    public static String formatXml(String unformattedXml) {
        try {
            // Create a transformer to modify the XML
            Transformer transformer = TransformerFactory.newInstance().newTransformer();

            // Set indenting and indentation amount
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

            // Convert the XML string to a DOM source
            DOMSource source = new DOMSource(new DocumentBuilder().parse(new InputSource(new StringReader(unformattedXml))));

            // Format the XML and store the result in a string
            StreamResult result = new StreamResult(new StringWriter());
            transformer.transform(source, result);
            return result.getWriter().toString();
        } catch (TransformerException | ParserConfigurationException | SAXException e) {
            // Handle any exceptions
            throw new RuntimeException(e);
        }
    }

}

String unformattedXml = "<tag><nested>hello</nested></tag>";
String formattedXml = XmlBeautifier.formatXml(unformattedXml);

<?xml version="1.0" encoding="UTF-8"?>
<root>
  <tag>
    <nested>hello</nested>
  </tag>
</root>