Here is an example of how to parse a string containing XML to a DOM object in Java using the standard Java libraries:

String xmlString = "<root><element>value</element></root>";
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
InputSource inputSource = new InputSource(new StringReader(xmlString));
Document document = builder.parse(inputSource);
Element rootElement = document.getDocumentElement();

In this example, we create a String object containing the XML to be parsed. We then create a DocumentBuilderFactory object and use it to create a DocumentBuilder. The DocumentBuilder is used to parse the InputSource object created from the String object. Finally, we obtain the root element of the resulting Document object.

Note that this code may throw exceptions such as ParserConfigurationException, SAXException, and IOException, so you should be prepared to handle these exceptions in your code.