# javax.xml.parsers

***

**1. Create a new DocumentBuilderFactory**

```java
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
```

**2. Set the validating parser to true**

```java
factory.setValidating(true);
```

**3. Create a new DocumentBuilder**

```java
DocumentBuilder builder = factory.newDocumentBuilder();
```

**4. Parse an XML file**

```java
Document document = builder.parse(new File("file.xml"));
```

**5. Get the root element of the XML document**

```java
Element root = document.getDocumentElement();
```

**6. Get the children of the root element**

```java
NodeList children = root.getChildNodes();
```

**7. Get the first child of the root element**

```java
Node firstChild = root.getFirstChild();
```

**8. Get the last child of the root element**

```java
Node lastChild = root.getLastChild();
```

**9. Get the next sibling of a node**

```java
Node nextSibling = node.getNextSibling();
```

**10. Get the previous sibling of a node**

```java
Node previousSibling = node.getPreviousSibling();
```

**11. Get the parent of a node**

```java
Node parent = node.getParentNode();
```

**12. Get the text content of a node**

```java
String textContent = node.getTextContent();
```

**13. Set the text content of a node**

```java
node.setTextContent("new text content");
```

**14. Create a new element**

```java
Element newElement = document.createElement("newElement");
```

**15. Add a new element to the root element**

```java
root.appendChild(newElement);
```

**16. Remove a child from the root element**

```java
root.removeChild(child);
```

**17. Save the XML document to a file**

```java
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.transform(new DOMSource(document), new StreamResult(new File("file.xml")));
```

**18. Parse an XML string**

```java
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document document = builder.parse(new InputSource(new StringReader(xmlString)));
```

**19. Get the namespaceURI of an element**

```java
String namespaceURI = element.getNamespaceURI();
```

**20. Get the prefix of an element**

```java
String prefix = element.getPrefix();
```

**21. Get the local name of an element**

```java
String localName = element.getLocalName();
```

**22. Get the attributes of an element**

```java
NamedNodeMap attributes = element.getAttributes();
```

**23. Get the value of an attribute**

```java
String value = attribute.getValue();
```

**24. Set the value of an attribute**

```java
attribute.setValue("new value");
```

**25. Remove an attribute from an element**

```java
element.removeAttribute("attributeName");
```

**26. Create a new attribute**

```java
Attr newAttribute = document.createAttribute("newAttribute");
```

**27. Add a new attribute to an element**

```java
element.setAttributeNode(newAttribute);
```

**28. Get the child elements of an element**

```java
NodeList childElements = element.getElementsByTagName("childElement");
```

**29. Get the first child element of an element**

```java
Element firstChildElement = element.getElementsByTagName("childElement").item(0);
```

**30. Get the last child element of an element**

```java
Element lastChildElement = element.getElementsByTagName("childElement").item(element.getElementsByTagName("childElement").getLength() - 1);
```

**31. Get the next sibling element of an element**

```java
Element nextSiblingElement = element.getNextSibling();
```

**32. Get the previous sibling element of an element**

```java
Element previousSiblingElement = element.getPreviousSibling();
```

**33. Get the parent element of an element**

```java
Element parentElement = element.getParentElement();
```

**34. Get the text content of an element**

```java
String textContent = element.getTextContent();
```

**35. Set the text content of an element**

```java
element.setTextContent("new text content");
```

**36. Create a new element**

```java
Element newElement = document.createElement("newElement");
```

**37. Add a new element to the root element**

```java
element.appendChild(newElement);
```

**38. Remove a child from the root element**

```java
element.removeChild(child);
```

**39. Save the XML document to a file**

```java
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.transform(new DOMSource(document), new StreamResult(new File("file.xml")));
```

**40. Parse an XML string**

```java
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document document = builder.parse(new InputSource(new StringReader(xmlString)));
```

**41. Get the namespaceURI of an element**

```java
String namespaceURI = element.getNamespaceURI();
```

**42. Get the prefix of an element**

```java
String prefix = element.getPrefix();
```

**43. Get the local name of an element**

```java
String localName = element.getLocalName();
```

**44. Get the attributes of an element**

```java
NamedNodeMap attributes = element.getAttributes();
```

**45. Get the value of an attribute**

```java
String value = attribute.getValue();
```

**46. Set the value of an attribute**

```java
attribute.setValue("new value");
```

**47. Remove an attribute from an element**

```java
element.removeAttribute("attributeName");
```

**48. Create a new attribute**

```java
Attr newAttribute = document.createAttribute("newAttribute");
```

**49. Add a new attribute to an element**

```java
element.setAttributeNode(newAttribute);
```

**50. Get the child elements of an element**

```java
NodeList childElements = element.getElementsByTagName("childElement");
```