Java file uri with xml file null pointer exception [closed]

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I am using windows OS, and want to parse xml file, but get null pointer error....

    public void print( )
    throws SAXException, IOException {

             DocumentBuilder builder;

   开发者_如何学Python         Document document = builder.parse( "D:\\my\\xml.xml");//null pointer exception

}

here is the solution:

public class DOMPrinter {

         private DocumentBuilder builder;


        public void print(String fileName )//, PrintStream out)
                throws SAXException, IOException {

            try
            {
                DocumentBuilderFactory fact= DocumentBuilderFactory.newInstance();

                builder= fact.newDocumentBuilder();

            Document document = builder.parse( fileName);

            Node node = document.getDocumentElement();
              String root = node.getNodeName();
              System.out.println("Root Node: " + root);

            }
            catch (Exception e) {
                // TODO: handle exception
            }
}

I didn't use DocumentBuilderFactory to create DocumentBuilder , so that was a error.

---

You never instantiated builder. You need to say builder = ...;

Also, you can't have private fields inside a method. Delete the private keyword.