import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLStreamWriter;

import javax.xml.transform.stax.StAXResult;
import java.io.ByteArrayOutputStream;



public class Test{
	public static void main(String[] args){
		Test.f1() ;
		//Test.f2() ;
		//Test.f3() ;
		//Test.f4() ;
		//Test.f5() ;
	}

	public static void f1(){
		try {
            XMLOutputFactory ofac = XMLOutputFactory.newInstance();
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            XMLStreamWriter swriter = ofac.createXMLStreamWriter(buffer);
            StAXResult res = new StAXResult(swriter);
            XMLEventWriter writer = ofac.createXMLEventWriter(res);

            XMLEventFactory efac = XMLEventFactory.newInstance();
            writer.add(efac.createStartDocument(null,"1.0"));
            writer.add(efac.createStartElement("", "", "root"));
            writer.add(efac.createEndElement("", "", "root"));
            writer.add(efac.createEndDocument());
            writer.close();
            System.out.println(buffer.toString());
        } catch(Exception e) {
            e.printStackTrace();
        }

	}

}