MAHARASHTRA STATE BOARD OF TECHNICAL ...kavediasir.yolasite.com/resources/12259-Advanced...

MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION (Autonomous)

(ISO/IEC - 27001 - 2005 Certified)

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SUMMER – 12 EXAMINATION

Subject Code : 12259 Model Answer Page No : 1-24

Q.1

a) To check how many fonts are available on the computer system GraphicsEnvironment class is

used. To use the methods obtained by this class, GraphicsEnvironment reference is required. This

reference can be obtained by using getLocalGraphics environment () static method which is defined

by graphicsEnvironment. It is given by static GraphicsEnvironment getLocalGraphicsEnvironment ()

Method : string [] getAvailableFontFamilyName ()

for eg.

import java.applet.*;

import java.awt.*;

/*<applet code = "showFonts" width = 500 height = 400></applet>*/

public class showFonts extends Applet

{

public void paint(Graphics g)

{

String msg = "";

String FontList[];

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();

FontList = ge.getAvailableFontFamilyNames();

/*for(int i = 0; i< FontList.length; i++)

{

msg = FontList[i] +"";

g.drawString(msg, 4, i*10);

}*/

int l = FontList.length;

showStatus("Number of Fonts"+l);

}

}

Marking scheme 1½ marks for explanation remaining for program

b) Checkbox is a control that is used to turn an option on or off. It consists of a small box that can

either contain a check mark or not. There is a label associated with each check box. That describes

what option the box represents. To use the setLabel () method, the object of checkbox should be

created using any constructor.

For eg.

Checkbox c1 = new checkbox ();

c1 setLabel(“new Label”);

The method getState() determines it the checkbox is checked (true) or unchecked (false). The method

return true or false.

For eg. c1.getState();

2 marks for each method



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c) scrollpanes – it provides a scrollable view of a light weight component. Horizontal & or vertical

scroll bars may be provided if necessary.

Tree – tree is a component that presents a hierarchical view of data. A user can expand or collapse

individual subtrees in the display.

2 marks for each swing control.

d) Servlets are small programs that execute on the serverside of a web connection. genericSevlets

exists to allow the handling of request using any protocol. -1

Difference between GenericServlet & Httpservlet (Any three points from the following -3 marks)

GenericServlet

HttpServlet

1 it is protocol independent 1 it is protocol dependent

2 can handle all types of protocol. 2 can handle only Http specific protocol.

3 it belong to javax servlet package 3 it belong to javax.servlet http package

4 it is an abstract class which extends object &

implements servlet, servlet config &

java.io.serializable interfaces.

4 it is an abstract class which extends

GenericServlet & implements java.io.serializable

interfaces.

5 it overrides service() method. It does not

contain doGet () & doPost() methods.

5 it adds the support to doGet() &

doPost(),doHead(),doPut(),doOptions(),doDelete()

& doTrace() methods.

e) two marks for each:

Reserved sockets

A socket is one end point of a two way communication between two programs running of the

network . a port is the physical connection to the network. When an object of socket is created it

requires a port number. Once connected , a higher level protocol ensures , which is dependent on

which port is being used. TCP/IP reserves the lower 1024 ports for specific protocols. These are

known as reserved sockets. Some of the reserved sockets are as follows:

Port number protocol(services)

21 FTP

23 Telnet

25 email

79 Finger

80 HTTP

119 netnews

(Any two of the above examples)

DNS (Domain Naming services) – It is service internet uses to convert alphanumeric names such as

google.com ( or any other) to 32 bit binary IPV4 or 128-bit IPV6 address.



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f) ( Two marks for each method)

i) getConnection () – this method from JDBC is the means of establishing a connection between

Url & database. When this method is calleds. the DriveManager searches a suitable driver

from the ones loaded at initialization. For eg:

Connection con;

Con= DriveManager.getConnection();

ii) createdStatement(): once a connection is obtained , user can interact with the data

database.theStatement interface defines methods that enable user to send SQL queries &

receive data from the database.

For eg.

Connection con;

Statement st;

St = con. createStatement();

Q 2

a) Frame is a subclass of windows & has a title bar, menu bar, border & resizing corners.

i) import java.awt.*;

import java.awt.event.*;

public class AwtCloseButtonEvent{

public static void main(String[] args){

Frame frame = new Frame("Close Operation Frame");

frame.setSize(400,400);

frame.setVisible(true);

frame.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent we)

{

System.exit(0);

}

});

}

}

ii)

import java.awt.Frame;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

public class CloseFrame extends Frame{



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CloseFrame(String title)

{

super(title);

addWindowListener(new MyWindowAdapter(this));

this.setSize(300,300);

this.setVisible(true);

}

class MyWindowAdapter extends WindowAdapter{

CloseFrame myWindow = null;

MyWindowAdapter(CreateWindowWithEventsExample myWindow){

this.myWindow = myWindow;

}

public void windowClosing(WindowEvent e)

{

myWindow.setVisible(false);

}

}

public static void main(String[] args)

{

CloseFrame myWindow =

new CloseFrame("Window with event Example");

}

}

Or Any other example based on above mentioned concept.

b)

import javax.swing.*;

/*<applet code = exam.class height = 300 width = 300></applet>*/

public class exam extends JApplet

{

public void init()

{

JTabbedPane jtp = new JTabbedPane();

jtp.add("Font", new FontPanel());

jtp.add("Effects", new EffectsPanel());

jtp.add("Spacing", new SpacingPanel());

getContentPane().add(jtp);

}

}



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class FontPanel extends JPanel

{

public FontPanel()

{

JComboBox jcb = new JComboBox();

jcb.addItem("Font");

jcb.addItem("Font Style");

jcb.addItem("Font Size");

add(jcb);

}

}

class EffectsPanel extends JPanel

{

public EffectsPanel()

{

JCheckBox jcb1 = new JCheckBox("Subscript");

add(jcb1);

JCheckBox jcb2 = new JCheckBox("Superscript");

add(jcb2);

JCheckBox jcb3 = new JCheckBox("Strike");

add(jcb3);

JCheckBox jcb4 = new JCheckBox("Shadow");

add(jcb4);

}

}

class SpacingPanel extends JPanel

{

public SpacingPanel()

{

String[] data = {"Spacing","Position Margin"};

JList jl = new JList(data);

add(jl);

}

}

Or any other program based on above mentioned concept.

c) JDBC driver types

1. JDBC – ODBC bridge driver

The bridge translates JDBC method calls into ODBC function calls. It is two-tier

architecture.

2. Native API – partly java driver or (Native Library – to java drivers)



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It uses native c language library calls to translate JDBC calls to native client Library, it is

two tier architecture.

3. Native protocol pure java driver or DBMS protocol all java driver- this allows a direct call

from client machine to DBMS server. It is two tier architecture.

4. JDBC net pure Java Driver or DBMS independent network protocol Driver-JDBC calls

are translated by this Driver into a DBMS independent protocol & sent to a middle tier

code can contact a variety of data bases on behalf of the client. It is a three tier

architecture.

d)

import java.awt.*;



/*<applet code = exam1.class height = 300 width = 300></applet>*/

public class exam1 extends Applet implements ActionListener

{

TextField t1, t2, t3;

Button b1;

public void init()

{

t1 = new TextField(10);



b1 = new Button("Change Color");

add(t1);

add(t2);

add(t3);

add(b1);

b1.addActionListener(this);

}

public void actionPerformed(ActionEvent e)

{

int r = Integer.parseInt(t1.getText());

int g = Integer.parseInt(t2.getText());

int b = Integer.parseInt(t3.getText());

Color c = new Color(r, g, b);

setBackground(c);

}

}



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Q 3 A)

i)

import java.awt.*;



public class calc extends Applet implements ActionListener

{

TextField test1, test2, test3,test4;

Label l1,l2;

Button b1;

public void init()

{

test1=new TextField(8);




l1= new Label("Enter marks of 3 subjects :");

l2=new Label("Average:");

b1= new Button("Find Average");

setLayout(new FlowLayout());

add(l1);

add(test1);

add(test2);

add(test3);

add(l2); add(test4);

add(b1);

b1.addActionListener(this);

}

public void actionPerformed(ActionEvent e)

{

int t1,t2,t3;

float av;

t1= Integer.parseInt(test1.getText());



av=((t1+t2+t3)/3);

test4.setText(Float.toString(av));

}

}



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/*<applet code=calc height=200 width=200>

</applet>*/

Logic=3 marks, syntax =3 Marks , design=2 marks

Q3 b) Give the use of following methods of connection and statement interface.

i) createStatement()

it is the method of connection interface . it creates a statement object for sending SQL

statement to database.

Ex.:

Statement st = con.createStatement();

03 marks

ii) executeQueruy()

It is the method of Statement interface. It executes an SQL statement that returns a single

Resultset object.

Syntax:

Resultset rs = st. executeQuery(“select…..”);

03 Marks

iii) getResultset ()

It is the method of statement interface . It returns the current result as Resultset object.

Eg:

Resultset rs = st.getResultset();

02 marks

Q3 c)

import java.awt.*;

public class MenuTest extends Frame

{

MenuTest(String title)

{

super(title);

MenuBar mb=new MenuBar();

Menu file=new Menu("File");

Menu edit=new Menu("Edit");

Menu view=new Menu("View");



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MenuItem nw=new MenuItem("New");

MenuItem open=new MenuItem("Open");

file.add(nw);

file.add(open);

mb.add(file);

mb.add(edit);

mb.add(view);

setMenuBar(mb);

}

public static void main(String arg[])

{

MenuTest obj=new MenuTest("My Frame");

obj.setSize(200,400);

obj.setVisible(true);

}

}

Logic=3 marks, syntax =3 Marks , design=2 marks

Q 4 a) What is InetAddress ? Explain factory methods if InetAddress.

Ans: All the classes required for network programming in java can be imported through java.net

package.

For identifying the IP address of a computer, java.net provides a major class as InetAddress. This

class can be used to obtain IP Address & domain name . this ip Address can then be used by other

networking classes while specifying the address of destination & source for data packets.

InetAddress class has no visible constructor for creating an object of InetAddress class one of the

available factory methods can be used. Factory methods are the conventions where by static methods

in class return an instance of class. (01 mark each)

Commonly used InetAddress factory methods are:

i) static InetAddress getLocalHost()

- Return the InetAddress object that represents Local host.

ii) Static InetAddress getByName (string hostname)

- Return InetAddress object for a host name passed to it.

iii) Static InetAddress[] getAllByName(string hostname)

- Returns an array of InetAddress that represents all of the address that a particular name

resolves to .



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All these methods throw unknownHostException if they are unable to resolve the hostname.

Q4 b) 01 mark each

Ans :

A Resultset object maintain a cursor pointing to its current row of data. For navigating

through database records following methods of Resultset object can be used.

Comidering „rs‟ as the Resultset object .

i) rs.first () – moves the cursor to the first row in the Resultset object.

ii) rs.last() – moves the cursor to the last row in the Resultset object.

iii) rs.next () – moves the cursor down one row from its current position.

iv) rs.previous () – moves the cursor to the previous row in the Resultset object.

Q4 c) Illustrate the use of accept() and close() methods of serversocket with suitable example.

Ans: ServerSocket class is used to create server socket for listening to client request.

Methods:

i) Socket accepts () – it makes server socket to listen the client connection & accept it.

ii) void close () – it is used to close server socket connection. 02 marks

Example showing use of (i) accept () & (ii) close () methods of ServerSocketclass.

/* server side program*/

Import java.net.*;

Import java.io.*;

class serverside

{

Public static void main(String args[]) throws IOException

{

ServerSocket skt = new ServerSocket(1200);

Socket st = skt.accept();



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InputStream is = st.get InputStream();

BufferedReader br = new bufferedReader(new InputStreamReader(is));

String s = br.readLine();

System.out.println(“Client sent:”+s);

St.close();

Skt.close();

}

}

Example 02 marks(any other example can be considered)

Q4 d)

Ans: A Tree is a component that presents a hierarchical view of the data. It can be expanded or

collapsed in its individual subtrees. Trees are implemented in Swing by JTree class. The

DefaultMutableTreeNode class represents a node in the tree. One of its constructors is as below:

DefaultMutableTreeNode(Object obj) where obj is the object to be enclosed in the tree node.

To create hierarchy of tree nodes, add() method of DefaultMutableTreeNode can be used. Its syntax

is void add(DefaultMutableTreeNode childobj) 02 marks

Example 02 marks(any other example can be considered)

Example :


import javax.swing.tree.*;

import java.awt.*;

public class tree extends JApplet

{

JTree tree;

public void init()

{

DefaultMutableTreeNode t= new DefaultMutableTreeNode("IF");

DefaultMutableTreeNode a=new DefaultMutableTreeNode("Java");

t.add(a);

DefaultMutableTreeNode b= new DefaultMutableTreeNode ("Adv java");

a.add(b);

Container cnt = getContentPane();

cnt.setLayout(new FlowLayout());



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tree =new JTree(t);

JScrollPane js = new JScrollPane (tree);

cnt.add(js);

cnt.add(tree);

}

}

/*<applet code="tree" height=150 width=150>

</applet>*/

Q 4 e)

import java.awt.*;


public class jcombo extends JApplet

{

JComboBox jcb;

String st[]={"mouse","keyboard","battery","UPS","Stabilizer"};

public void init()

{


jcb=new JComboBox(st);

add(jcb);

}

}

/*<applet code=jcombo height=200 width=200>

</applet>*/

Logic 2 marks syntax 2 marks (any other logic can be considered)

Q 5 a) Attempt any three of the following:

i) URL Connection class:

This class of java.net enables to implement streams to read & write the contents of

URL.

It is a super class & represents the link between URL & Application over the n/w. you

can use URL Connection to inspect the properties of the remote object.

An object of URLConnection class can be created using openConnection() of URL

object.

02 marks

Example: Program to read content of Html file from URL print on screen.



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Example 2 marks

import java.net.*;

import java.io.*;

class url8_5

{

public static void main(String args[])throws MalformedURLException,IOException

{

URL u1=new URL("http://localhost:8080/index.htm");

URLConnection u2=u1.openConnection();

String ct=u2.getContentType();

System.out.println("Content type:"+ct);

InputStream ip=u2.getInputStream();

int c;

while((c=ip.read())!=-1)

{

System.out.print((char)c);

}

}

}

Any other example can be considered.

ii) Methods of URL class:

1. getProtocol():

- Returns the protocol name of the current URL.

2. getPort():

- Returns the port of the current URL it returns integer value.

3. getHost ():



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- Returns the hostname of the current URL.

4. getFile():

- Returns the Filename of the current URL.

(Example 2 marks)

Example: program to print protocol, port, hostname, & file of http: \\www.msbte.com .

import java.net.*;

import java.io.*;

class urltest1

{

public static void main(String args[]) throws MalformedURLException

{

URL ul = new URL("http://www.msbte.com ");

String s1 = ul.getProtocol();

String s2 = ul.getFile();

String s3 = ul.getHost();

int n=ul.getPort();

System.out.println("Protocol name :" +s1);

System.out.println("File name :" +s2);

System.out.println("Host name :" +s3);

System.out.println("Port no :" +n);

System.out.println("Ext : " +ul.toExternalForm());

}

}



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iii) Techniques of session management / tracking .

1. URL Rewriting :

With URL rewriting ,you append a taken or identifier to the URL of the next servlet.

You can send parameter name/value pairs using following format:

url? Name1= value1 & name2 = value2 &……

When the user clicks the hyperlinks, the parameter name/value pairs will be passed to

the server.

From a servlet, you can use Https servletRequest interfaces getparameter method to

obtain a parameter value.

request.getparameter(name1);

2. Hidden Fields:

Another technique for managing user sessions is by passing a taken as the value for an

HTML hidden field you can read the value viewing the HTML source code.

This method is easy to use, an HTML form is always required.

3. Cookies:

A cookie is stored on client & contains stale information.

Cookies are valuable for tracking , user sessions. A cookie can store users name,

address & other information.

Servlet can add information in the form of cookie with addcookie() method of

HttpServletResponse interface. This data get included in the header of httpResponse

that is send to the browser. The names & values of cookies are stored on client

machine.

Information of each cookie includes name,value, expiration date,path,domain etc.

If the domain & Path of cookie is supplied to the webserver.

4. Session Objects:

A session can be created with the help of getsession () method of HTTPServletRequest. It

returns HttpSession object.

A session stale is shared among all the servlet that are associated with a particular

client.



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Every user of a site is associated with javax.servlet.http package.

Httpsession object can be used to store & retrieve information about the user who is

visiting the site.

An Httpsession object uses a cookie or URL rewriting to send a token to the client. If

cookies are used to convey session identifiers, the client browser are required to accept

cookies.

The session identifier is used to associate a user with a session object in the server.

Any four techniques for each technique 1 marks

iv) Servlet Life cycle:

Three methods are central to the life cycle of a servlet . these are :

1. Init()

2. Service()

3. Destroy()

They are implemented by every servlet & are invoked at specific times by server.

First assume that a user enters a URL to a web browser. The browser then generates an

HTTP request for this URL. This request is then sent to the appropriate server.

This Http request is received by the web server. The server maps this request to a

particular servlet. The servlet is dynamically retrieved & loaded into the address space of

the server.

The server invokes init() method of the sorvlet . this method is invoked is invoked

only when the servlet is first loaded into memory. Using init() method , the

initialiazation parameter can be pass to the servlet to configure itself.

Then, the server invokes the service() method of the servlet . this method is called to

process the Http request. It may also formulate an Http response for the client.

The server remains in the servers address space & is available to process any other

Http request received from clients.

The service() method called for each Http request.

When server decides to unload servlet from its memory, it calls destroy() method . it

relinquish any resource such as file handles that are allocated for the servlet.



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Subject Code: 12259 Model Answer Page No : 17-24

Q5 b) Attempt any one of the following:

i) Use of cookie:

A cookie is stored on a client & contains stale information.

Cookies are valuable for tracking , user sessions. A cookie can store users name,

address & other information.

Information of each cookie includes name, value, expiration date, path, domain etc.

Expiration date determines when cookie is deleted from client machine.

When a browser stores your passwords & users ID‟s they are also used to store

preferences of start pages.

An online ordering system could be developed using cookies that would remember

what a person wants to busy.

(03 marks)

Any three points from above.

Example:

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class exp17 extends HttpServlet

{

public void doGet(HttpServletRequest req,HttpServletResponse res) throws

IOException,ServletException

{

PrintWriter pr;

pr=res.getWriter();

res.setContentType("text/html");

Cookie[] c=req.getCookies();

(03 marks)



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if ((c != null) && (c.length > 0))

{

for(int i=0;i<c.length;i++)

{

Cookie c3=c[i];

String nm=c3.getName();

String vl=c3.getValue();

pr.println("<big>"+nm+"="+vl);

}

}

else

pr.print("<big>No cookies available");

}

}

<html>

<body>

<form method=”post” action=http://localhost:8080/examples/servlet/exp17_1>

Enter Username:<br>

<input type=”text” name=”username”><br>

Enter password:<br>

<input type=”password” name=”pswd”><br>

<br>

<input type =”submit” value=”submit”>

</form></body>

</html>

(any other valid example can be considered)

http://localhost:8080/examples/servlet/exp17_1



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The executeUpdate () method of the statement object enables you to execute SQl

update statement such as delete, insert & update.

The method takes a string containing the SQL update statement & returns an integer

that determine how many records were affected by SQL statement.

For update , insert & delete the records first establish connection , between application

& database.

After establishing connection , create the object of statement interface & call the

createStatement() method using object of connection interface.

The statement object can be created as,

Statement st = con.createStatement();

After creating statement object , the SQL statement can be used for insert, delete &

updare the records.

SQL Stmt can be created as:

String s1 = “insert into statement values(„rima‟,2);

String s2 = “update statement set rollno = 3 where rollno = 2”;

String s3 = “delete from student”;

For execute the above statement, executeUpdate() method can be used as:

st.executeUpdate(s1);

st.executeUpdate(s2);

St.executeUpdate(s3);



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Q.6 a)

import java.sql.*;

public class test2

{

public static void main(String[] args)

{

Connection con;

try

{

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

System.out.println("connection has been successfully established");

}

catch (Exception e)

{

}

try

{

String str="jdbc:odbc:Mobile";

con=DriverManager.getConnection(str," "," ");

Statement st=con.createStatement();

st.executeUpdate("insert into t1 values('ABC',2356,2390,'50MB')");

st.executeUpdate("insert into t1 values('TATA',2556,3390,'2GB')");

st.executeUpdate("insert into t1 values('ABC',2356,1390,'90MB')");

st.executeUpdate("insert into t1 values('Nokia',1356,12390,'1GB')");

st.executeUpdate("insert into t1 values('ABC',2350,23900,'3GB')");

ResultSet rs=st.executeQuery("select * from t1 where company like 'ABC'");

System.out.println("Mobiles belongs to ABC Company");

int n=rs.getMetaData().getColumnCount();

for(int i=1;i<=n;i++)

{

System.out.print(rs.getMetaData().getColumnLabel(i)+'\t');

}

System.out.println();

while(rs.next())

{

for(int i=1;i<=n;i++)

{

System.out.print(rs.getString(i)+'\t');

}


}


ResultSet rs1=st.executeQuery("select * from t1 order by cost");

System.out.println("Records in ascending order");

int n1=rs1.getMetaData().getColumnCount();



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for(int i=1;i<=n1;i++)

{

System.out.print(rs1.getMetaData().getColumnLabel(i)+'\t');

}


while(rs1.next())

{

for(int i=1;i<=n1;i++)

{

System.out.print(rs1.getString(i)+'\t');

}


}

con.close();

}

catch (SQLException e)

{

System.out.println(e);

}

}

}

Q 6 b)


import java.awt.*;



public class testapp extends JApplet implements ItemListener

{

String msg=" ";

JComboBox jc;

JList jl;

JLabel jb;

String country[]={"India","Australia","USA","SriLanka","Pakistan"};

String capital[]={"Delhi","Perth","NewYork","Columbo","Karachi"};

public void init()

{

//Container cnt=getContentPane();


jb=new JLabel("test");



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jc=new JComboBox(country);

jl=new JList(capital);

add(jc);

add(jl);

add(jb);

jc.addItemListener(this);

}

public void itemStateChanged(ItemEvent e)

{

if(jc.getSelectedItem().toString().equals("India"))

{

jl.setSelectedIndex(0);

msg=jl.getSelectedValue().toString();

jb.setText(msg);

}

if(jc.getSelectedItem().toString().equals("Australia"))

{



jb.setText(msg);

}

if(jc.getSelectedItem().toString().equals("USA"))

{



jb.setText(msg);

}

if(jc.getSelectedItem().toString().equals("SriLanka"))

{



jb.setText(msg);

}

if(jc.getSelectedItem().toString().equals("Pakistan"))

{



jb.setText(msg);

}

}

}

/*<applet code=testapp height=200 width=200>

</applet>*/



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SUMMER – 12 EXAMINATIONS


Q.6 c) 04 marks

i) httppost.java

import java.io.*;



public class httppost extends HttpServlet

{

public void doPost(HttpServletRequest req,HttpServletResponse res)throws


{

PrintWriter pr;

pr=res.getWriter();


String username=req.getParameter("username");

String password=req.getParameter("password");

pr.println("<b> Username : "+username+"<br>");

pr.println("Password :" +password);

pr.close();

}

}

Post.html

<html>

<head></head>

<body>

<form method="post" action="http://localhost:8080/examples/servlet/httppost">

Enter Username : <br>

<input type="text" name="username"><br>

Enter Password : <br>

<input type="password" name="password"><br>

<br>

<input type="submit" value="Submit">

</form>

</body>

</html>

ii) 04 marks

httpget.java

import java.io.*;



public class httpget extends HttpServlet

{

public void doGet(HttpServletRequest req,HttpServletResponse res)throws


{

PrintWriter pr;

pr=res.getWriter();


String username=req.getParameter("username");



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String password=req.getParameter("password");

pr.println("<b> Username : "+username+"<br>");

pr.println("Password :" +password);

pr.close();

}

}

get.html

<html>

<head></head>

<body>

<form method="get" action="http://localhost:8080/examples/servlet/httpget">

Enter Username : <br>

<input type="text" name="username"><br>

Enter Password : <br>

<input type="password" name="password"><br>

<br>

<input type="submit" value="Submit">

</form>

</body>

</html>

(any other valid program can be considered)

Date post:	23-Mar-2020
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