### Question:
Node implements Cloneable { public Node traverse(NodeVisitor nodeVisitor) { Validate.notNull(nodeVisitor); NodeTraversor.traverse(nodeVisitor, this); return this; } protected  Node(); abstract String nodeName(); boolean hasParent(); String attr(String attributeKey); String getAttr(String attributeKey, String defaultValue); abstract Attributes attributes(); Node attr(String attributeKey, String attributeValue); @Deprecated void addAttr(String attributeKey, String attributeValue, String separator); boolean hasAttr(String attributeKey); Node removeAttr(String attributeKey); Node clearAttributes(); @NotNull Node getOwnerDocumentNode(); @NotNull Node getOwnerBody(); String getImmutableText(); void setImmutableText(String immutableText); @NotNull RealVector getFeatures(); void setFeatures(@NotNull RealVector features); @NotNull Map<String, Object> getVariables(); @NotNull Map<String, List<Object>> getTuples(); int siblingSize(); abstract String baseUri(); void setBaseUri(final String baseUri); String absUrl(String attributeKey); Node childNode(int index); List<Node> childNodes(); List<Node> childNodesCopy(); abstract int childNodeSize(); Node parent(); final Node parentNode(); Node root(); Document ownerDocument(); void remove(); Node before(String html); Node before(Node node); Node after(String html); Node after(Node node); Node wrap(String html); Node unwrap(); void replaceWith(Node in); List<Node> siblingNodes(); Node nextSibling(); Node previousSibling(); int siblingIndex(); Node traverse(NodeVisitor nodeVisitor); Node filter(NodeFilter nodeFilter); String outerHtml(); T html(T appendable); String toString(); @Override boolean equals(Object o); boolean hasSameValue(Object o); @Override Node clone(); Node shallowClone(); static final String EmptyString; static final RealVector EMPTY_FEATURE; }### Answer:
@Test public void traverse() { Document doc = Jsoup.parse("<div><p>Hello</p></div><div>There</div>"); final StringBuilder accum = new StringBuilder(); doc.select("div").first().traverse(new NodeVisitor() { public void head(Node node, int depth) { accum.append("<" + node.nodeName() + ">"); } public void tail(Node node, int depth) { accum.append("</" + node.nodeName() + ">"); } }); assertEquals("<div><p><#text></#text></p></div>", accum.toString()); }