sax xml parsing problem when overwriting defaultHandler

 This post last edited by the xushuaic on 2012-08-30 16:50:41

Why four set the content processor
reader.setContentHandler (new TagValueHandler ()); when an error message appears :

No enclosing instance of type saxReader2 is accessible. Must qualify the allocation with an enclosing instance of type saxReader2 (egxnew A ( ) where x is an instance of saxReader2).

as well as in time with eclipse , when the cover defaultHandler why the argument list is arg, while not explicitly listed : url, localname, name it ?

package cn.xushuai.sax;
  
  <?xml version="1.0" encoding="UTF-8" standalone="no"?><exam>
  	<student examid="1111" idcard="0001">
  		<name>张三</name>
  		<location>北京</location>
  		<grade>90</grade>
  	</student>
  
  	<student examid="2222" idcard="0002">
  		<name>李四</name>
  		<location>上海</location>
  		<grade>93</grade>
  	</student>
  
  
  import java.io.IOException;
  
  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  import org.xml.sax.XMLReader;
  import org.xml.sax.helpers.DefaultHandler;
  
  public class saxReader2 {
  
  	public static void main(String args) throws ParserConfigurationException, SAXException, IOException {
  		// TODO Auto-generated constructor stub
  	
  	//1.创建解析工厂
  		SAXParserFactory factory = SAXParserFactory.newInstance();
  		
  	//2.获取解析器
  		SAXParser sp = factory.newSAXParser();
  		
  	//3.得到读取器
  		XMLReader reader = sp.getXMLReader();
  		
  		//4.设置内容处理器
  		reader.setContentHandler(new TagValueHandler());
  	
  		//5.读取xml文档内容
  		reader.parse("src/exam.xml");
  	}
  	
  	class TagValueHandler extends DefaultHandler{
  
  		private String currentTag;
  		private int neednumber = 2;
  		private int currentNumber=0;
  		
  		
  		@Override
  		public void startElement(String arg0, String arg1, String arg2,
  				Attributes arg3) throws SAXException {
  			
  			currentTag = arg2;
  			if(currentTag.equals("作者"))
  				currentNumber++;
  		}
  		
  		
  		@Override
  		public void characters(char[] arg0, int arg1, int arg2)
  				throws SAXException {
  			if("作者".equals(currentTag)&& currentNumber==neednumber){
  				
  				System.out.println(new String(arg0,arg1,arg2));
  			}
  		}
  
  		@Override
  		public void endElement(String arg0, String arg1, String arg2)
  				throws SAXException {
  			currentTag= null;
  		}
  				
  	}
  }
  

------ Solution ------------------------------------- -------
errors.
class TagValueHandler preceded by static

as well as in time with eclipse , when the cover defaultHandler why the argument list is arg, while not explicitly listed : url, localname, name it ?
The Eclipse, because the source code is not specified DefaultHandler .
it does not know the variable name. If you add the source code on it.
------ For reference only -------------------------------------- -

able to explain why you want to add static it ?
and how to join the specified in the Eclipse source code yet.
brother beginner javaweb, grateful
------ For reference only ---------------------------- -----------
when right-clicking inside the braces of the function on the line .