code to check if the string contains all digits or not

Long checkDataType(String s){

char c[]=s.toCharArray();
boolean isnum=true;

for(int i=0;i
     if(!Character.isDigit(c[i])){

    isnum=false;

    break;

  }

}

if(isnum)

return (Long.parseLong(s));

else

return null;

}

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All about XPath

this is the sample xml.


DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
dom = db.parse("C:/templates.xml");

 XPath xpath=XPathFactory.newInstance().newXPath();
 XPathExpression expr=xpath.compile("//templates/template[1]/label/text()");
 NodeList ns=(NodeList)expr.evaluate(dom,XPathConstants.NODESET);

 for(int i=0;i    {
        System.out.println(ns.item(i).getNodeValue());
 }

here the output will be the value of the label of 1st template tag.



XPathExpression expr=xpath.compile("//templates/template/label/text()");
  NodeList ns=(NodeList)expr.evaluate(dom,XPathConstants.NODESET);

here the output will be the value of all the labels present in all the template tags


XPathExpression expr=xpath.compile("//templates/template/@name");
NodeList ns=(NodeList)expr.evaluate(dom,XPathConstants.NODESET);

here the output will be the values of attribute name of all the template tags



 XPathExpression expr=xpath.compile("//templates/template");
 NodeList ns=(NodeList)expr.evaluate(dom,XPathConstants.NODESET);
    for(int i=0;i       NamedNodeMap la=ns.item(i).getAttributes();
    System.out.println(la.getNamedItem("name").getNodeValue());
}

if a tag has more than 1 attribute, then , values of the attributes can be fetched like this.


  XPathExpression expr=xpath.compile("//templates/template/@name");
    NodeList ns=(NodeList)expr.evaluate(dom,XPathConstants.NODESET);
    for(int i=0;i         ns.item(i).setNodeValue("this is test");
         Transformer xformer = TransformerFactory.newInstance().newTransformer();
         xformer.transform(new DOMSource(dom), new StreamResult(new File("C:/templates.xml")));
    }

This code is changing the value of the specified attribute,here the attribute name is 'name' and saving in the xml

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calling procedure and functon from java code

calling stored procedure :

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));


String s;
 String stmt="{call test(?)}";
 System.out.println(stmt);
 CallableStatement cs=con.prepareCall(stmt);
 System.out.println("enter the name of the employee");
 s=br.readLine();
 cs.setString(1,s);
 cs.execute();


calling function:

String stmt="{?=call test_fn(?)}";

String stmt="select test_fn('abc') from dual";
CallableStatement cs=con.prepareCall(stmt);
System.out.println("enter the name of the employee");
s=br.readLine();
cs.registerOutParameter(1,java.sql.Types.INTEGER);
cs.setString(2,s);
cs.execute();


to retrieve value
cs.getInt(1) ,so, in general , cs.get(Type)(index)


also instead of  "java.sql.Types.INTEGER", "oracle.jdbc.driver.OracleTypes.INTEGER" can be used.

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dom parser

package check;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;



public class DOM_Demo {

Document dom;

public static void main(String[] args) throws Exception {

new DOM_Demo().go();

}


void ret(Node d){

NodeList n=d.getChildNodes();

{
System.out.println(d.getNodeName());
for@(int i=0;i{
    if(n.item(i).getNodeType()==1)  // 1 IS THE VALUE FOR TAG
{ 
ret(n.item(i));

}
else

{
if(n.item(i).getNodeValue().trim().length()!=0)
System.out.println("val : "+n.item(i).getNodeValue());
}

}


}

}

void go() throws Exception

{
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
//Using factory get an instance of document builder

DocumentBuilder db = dbf.newDocumentBuilder();
//parse using builder to get DOM representation of the XML file

dom = db.parse("C:/Users/shasharm/Desktop/ibf/NS_ABIS_IRP_IP_E1.xml");

Element d = dom.getDocumentElement();

ret(d);

}

}

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sax parser

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

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.helpers.DefaultHandler;

public class SAXParserExample extends DefaultHandler{

    List myEmpls;
   
    private String tempVal;
   
    //to maintain context
    private Employee tempEmp;
   
   
    public SAXParserExample(){
        myEmpls = new ArrayList();
    }
   
    public void runExample() {
        parseDocument();
        printData();
    }

    private void parseDocument() {
       
        //get a factory
        SAXParserFactory spf = SAXParserFactory.newInstance();
        try {
       
            //get a new instance of parser
            SAXParser sp = spf.newSAXParser();
           
            //parse the file and also register this class for call backs
            sp.parse("employees.xml", this);
           
        }catch(SAXException se) {
            se.printStackTrace();
        }catch(ParserConfigurationException pce) {
            pce.printStackTrace();
        }catch (IOException ie) {
            ie.printStackTrace();
        }
    }

    /**
     * Iterate through the list and print
     * the contents
     */
    private void printData(){
       
        System.out.println("No of Employees '" + myEmpls.size() + "'.");
       
        Iterator it = myEmpls.iterator();
        while(it.hasNext()) {
            System.out.println(it.next().toString());
        }
    }
   

    //Event Handlers
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        //reset
        tempVal = "";
        if(qName.equalsIgnoreCase("Employee")) {
            //create a new instance of employee
            tempEmp = new Employee();
            tempEmp.setType(attributes.getValue("type"));
        }
    }
   

    public void characters(char[] ch, int start, int length) throws SAXException {
        tempVal = new String(ch,start,length);
    }
   
    public void endElement(String uri, String localName, String qName) throws SAXException {

        if(qName.equalsIgnoreCase("Employee")) {
            //add it to the list
            myEmpls.add(tempEmp);
           
        }else if (qName.equalsIgnoreCase("Name")) {
            tempEmp.setName(tempVal);
        }else if (qName.equalsIgnoreCase("Id")) {
            tempEmp.setId(Integer.parseInt(tempVal));
        }else if (qName.equalsIgnoreCase("Age")) {
            tempEmp.setAge(Integer.parseInt(tempVal));
        }
       
    }
   
    public static void main(String[] args){
        SAXParserExample spe = new SAXParserExample();
        spe.runExample();
    }
   
}

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jdbc connection with oracle 10 g

try{


String driverName = "oracle.jdbc.driver.OracleDriver";

Class.forName(driverName);



// Create a connection to the database

String serverName = "127.0.0.1";

String portNumber = "1521";

String sid = "xe";

String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + "/" + sid;

String username = "system";

String password = "9868626216";

Connection connection = DriverManager.getConnection(url, username, password);



String query="select * from employee";

Statement st= connection.createStatement();

ResultSet rs=st.executeQuery(query);

System.out.println(rs);

//while(rs.next())

//{



//System.out.println("not 1 empty");

//}











} catch (Exception e) {

// Could not find the database driver

e.printStackTrace();

}

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japplet fundamental

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class test extends JApplet  {

    public void go() {
       
       
        this.setSize(500,500);
        this.setVisible(true);
   
        this.setLayout(new FlowLayout());
        System.out.println("in go");
        JButton jb=new JButton("click me");
        this.add(jb);
       jb.addActionListener(new ActionListener()
       {
             public void actionPerformed(ActionEvent ae)
             {
                  JOptionPane.showMessageDialog(null,"japplet example");
                
                 }
           }
           );
    }
   
    public void init()
    {
        System.out.println("in init");
        try{
            SwingUtilities.invokeAndWait(new Runnable(){
                public void run()
                {
                    go();
                   
                    }
            });
        }
         catch(Exception e){
            
               e.printStackTrace();
             }
        
    }
   
   public void paint(Graphics g)
   {
          //g.drawString("hi shailesh",10,10);
       }
}

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creating object from string in java

import java.io.*;
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;


   
   

class test{
   
   
    static void display()
    {
        System.out.println("this is display");
        }
   
    public static void main(String args[]) throws Exception
    {
       
    String s="test";
   
    ((test)Class.forName(s).newInstance()).display();
       
    }
       
    }   

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code to execute .exe in java

import java.io.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.*;


public class test {
public static void main(String[] args) {
Runtime run = Runtime.getRuntime();
try {

Process pp=run.exec("progs");    // for cmd commands use=> run.exec("cmd /c dir");  where dir is a command. another eg=>run.exec("cmd /c javac x.java")
BufferedReader in =new BufferedReader(new InputStreamReader(pp.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
} catch (Exception e) {
e.printStackTrace();
System.out.println(e.getMessage());
}
}
}


//run.exec("cmd /c start");  for opening cmd

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Amdocs's placement experience

In this post , I want to share my experience of cracking Amdocs which was a combined product of god's grace and mutual cooperation ;-) .

Before Amdocs came in the campus , I already had the offer from GroupSoft , so , I was not fretting but yes,was wishing to crack it. 

Abstract details:

·         Total rounds- 3(online test, technical and hr interview)

·         Online test is conducted by MeriTrac and duration is 2 hours

·         There is no negative marking

·         The online test consist of different sections and to the best of my knowledge, there is a sectional cut-off.

·         The domain of the question paper are :

Ø  English comprehension (level was quite good )

Ø  Logical questions (level was good)

Ø  Quantitative questions (rs aggarwal is sufficient)

Ø  c/c++/java questions (You have to choose 1 language. I chose c language and I believe “Test your c skills” is more than enough to crack this section. Questions were mainly from pointers, bit-wise operators and outputs)

Ø  SQL (seriously very tough)

Ø  Unix (commands only. You can bank upon  Sambita Das unix book)

Tips for online exam:

As I have already mentioned that most probably there is a sectional cut off , so friends you can’t compromise with any section.

I had a group of three and we had different forte (I had very primitive knowledge of unix still I cleared the section …don’t think need to tell how ;-) )

If possible, try to crack it in a group (plz note that favorable ambience is not guaranteed always. May be a strict invigilator come at your time. So hope for the best and prepare for the worst)

Questions are same for all, just their order is changed, so be attentive.

 Technical interview:

Only 1 person was there. The questions were:                                                                                             

 ØExplanation of  final year B.Tech project(Questions from it)

 ØCurrent thesis work in M.Tech(Questions from it)

    Ø The challenges I faced in the projects and how I dealt with them

 ØA code -> to arrange the no.s in descending order(yes I guess I was lucky that day J)

 ØSome simple SQL queries.

Note :  I was lucky that my technical interviewer didn’t ask any question from unix but another interviewer who was taking interviews in another room, was asking unix questions also(commands and shell scripts)

HR interview:

Two people were there.

ØThe 1^st and basic question->Describe yourself. I mentioned about my +ve traits only,so,they asked if I have any –ve point also and what I am doing to tackle it?

ØWhy Amdocs?

ØThey mainly asked questions from what I had described about myself

ØHR was mainly an interaction session,they were briefing about the company and opportunities there.

ØAt last they asked me if I want to ask any question from them,so, be prepared for it too…(imp)

 All the best guys…J

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