Extend SAX parser event handler in Java

/*from ww  w  .j a  va2 s . c  o  m*/
import java.io.StringReader;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.helpers.DefaultHandler;
public class Main{
  public static void main(String args[]) throws Exception{
    SAXParserFactory spf = SAXParserFactory.newInstance();
    spf.setNamespaceAware(true);
    spf.setValidating(true);
    System.out.println("Parser will " + (spf.isNamespaceAware() ? "" : "not ")+ "be namespace aware");
    System.out.println("Parser will " + (spf.isValidating() ? "" : "not ") + "validate XML");
    SAXParser parser = spf.newSAXParser();
    System.out.println("Parser object is: " + parser);
    
    StringReader sr = new StringReader("<tag></tag>");
    
    parser.parse(new InputSource(sr), new MySAXHandler());
  }
}

class MySAXHandler extends DefaultHandler {
  public void startDocument() {
    System.out.println("Start document: ");
  }

  public void endDocument() {
    System.out.println("End document: ");
  }

  public void startElement(String uri, String localName, String qname, Attributes attr) {
    System.out.println("Start element: local name: " + localName + " qname: " + qname + " uri: "
        + uri);
  }

  public void endElement(String uri, String localName, String qname) {
    System.out.println("End element: local name: " + localName + " qname: " + qname + " uri: "
        + uri);
  }

  public void characters(char[] ch, int start, int length) {
    System.out.println("Characters: " + new String(ch, start, length));
  }

  public void ignorableWhitespace(char[] ch, int start, int length) {
    System.out.println("Ignorable whitespace: " + new String(ch, start, length));
  }
}