Java XML modification

hey I want to delete the nodes in Xml file & that should be updated in xml file.here is what i have tried.




import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class Delete {

public static void main(String [] args) {


String str="Close_0";

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = null;
Document doc = null;


try {

db = dbf.newDocumentBuilder();
doc = db.parse("Testsuite.xml");

String nodename = new String();
String nodevalue = new String();

NodeList listofmenus = doc.getElementsByTagName("Testcase");

for (int i = 0; i < listofmenus.getLength(); i++) {

Node testcase = listofmenus.item(i);
NodeList nodelist1 = testcase.getChildNodes();

for (int j = 0; j < nodelist1.getLength(); j++) {

Node node1 = nodelist1.item(j);

if (node1.getNodeName().equals("Menu")) {

NodeList nodelist2 = node1.getChildNodes();

for (int k = 0; k < nodelist2.getLength(); k++) {

Node node2 = nodelist2.item(k);

if (node2.getNodeName().equals("Nonterminal")) {

nodename = (node2.getNodeName());
nodevalue = (node2.getFirstChild()
.getNodeValue());

if(nodevalue.equals(str)){


testcase.removeChild(node1);

}
}
}
}

}

}



} catch (ParserConfigurationException e1) {
e1.printStackTrace();
}
catch (SAXException e) {
e.printStackTrace();
}
catch (Exception e) {
e.printStackTrace();
}



}

}





Here is Testsuite.xml

<?xml version="1.0" ?>
<Testsuite>
<Mode>STRUCTURAL</Mode>
<Testcase>
<Test>256</Test>
<Length>3</Length>

<Component>
<Window>mynotepad_0</Window>
<Nonterminal>AutoGenLabel_0</Nonterminal>
<Eventtype>LEFTCLICK</Eventtype>
<Eventvalue>UNKNOWN</Eventvalue>
</Component>

<Menu>
<Window>mynotepad_0</Window>
<Nonterminal>File_0</Nonterminal>
</Menu>

<Menu>
<Window>mynotepad_0</Window>
<Nonterminal>Open_0</Nonterminal>
</Menu>

</Testcase>

<Testcase>
<Test>257</Test>
<Length>3</Length>

<Component>
<Window>mynotepad_0</Window>
<Nonterminal>AutoGenLabel_0</Nonterminal>
<Eventtype>LEFTCLICK</Eventtype>
<Eventvalue>UNKNOWN</Eventvalue>
</Component>

<Menu>
<Window>mynotepad_0</Window>
<Nonterminal>File_0</Nonterminal>
</Menu>

<Menu>
<Window>mynotepad_0</Window>
<Nonterminal>Close_0</Nonterminal>
</Menu>

</Testcase>

<Testcase>
<Test>258</Test>
<Length>3</Length>

<Component>
<Window>mynotepad_0</Window>
<Nonterminal>AutoGenLabel_0</Nonterminal>
<Eventtype>LEFTCLICK</Eventtype>
<Eventvalue>UNKNOWN</Eventvalue>
</Component>

<Menu>
<Window>mynotepad_0</Window>
<Nonterminal>File_0</Nonterminal>
</Menu>

<Menu>
<Window>mynotepad_0</Window>
<Nonterminal>Edit_0</Nonterminal>
</Menu>

</Testcase>

<Testcase>
<Test>259</Test>
<Length>3</Length>

<Component>
<Window>mynotepad_0</Window>
<Nonterminal>AutoGenLabel_0</Nonterminal>
<Eventtype>LEFTCLICK</Eventtype>
<Eventvalue>UNKNOWN</Eventvalue>
</Component>

<Menu>
<Window>mynotepad_0</Window>
<Nonterminal>File_0</Nonterminal>
</Menu>

<Menu>
<Window>mynotepad_0</Window>
<Nonterminal>Search_0</Nonterminal>
</Menu>

</Testcase>
</Testsuite>