1014/BSc/IT/TY/Pre_Pap/2014/Adv. Java 1

T.Y. B.Sc. (IT) : Sem. V Advanced Java

Time : 2½ Hrs.] Prelim Question Paper [Marks : 75

Q.1 Attempt the following (any TWO) [10]Q.1(a) Explain Checkbox with example. [5](A) Checkbox [2 mark]

1) Checkbox is a class which is used to create Checkbox in awt. 2) It’s constructors are : Checkbox( ); Checkbox (string s); Checkbox (string s, Boolean state); Checkbox (string s, Boolean state, Checkbox Group (b)); Here Checkbox Group is a class which is used to convert a checkbox into a radio button. Checkbox Group has following two methods : 1) get Selected Checkbox ( ); It is used to retrieve a selected Checkbox. 2) Set Selected Checkbox (Checkbox c); It is used to select an appropriate Checkbox. Methods of Checkbox : i) getLabel( ); It is used to retrieve name of the Checkbox.

ii) setLael(string s); It is used to set a new name on a Checkbox.

iii) getState( ); It is used to retrieve state of the Checkbox.

iv) setState(Boolean State); It is used to set a new state to a Checkbox.

Write a program to create a following window which consist of five Checkboxes, by clicking them the appropriate message should get changed. [3 mark]

Vidy

alank

ar Group (bup (

sed to convert a to convert

thods : ds :

cted Checkbox. d Checkbo Checkbox c); eckbox c);

n appropriate Checpropriate C

ox : ox :

to retrieve name to retrieve name

el(string s); el(string s); ed to set a ned to se

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

2

import java.applet.*; import java.awt.event.*; import.java.awt.*; /* <applet code = test width = 200 height = 30> < /applet>/ public class test extends Applet implements ItemListener { Checkbox c1, c2, c3, c4, c5, public void init( ) { setLayout (new FlowLayout( )); c1 = new Checkbox (“Java”); c2 = new Checkbox (“Linux”); c3 = new Checkbox (“ASP”); c4 = new Checkbox (“ST”); c5 = new Checkbox (”NS”);

c1.addItem Listener (this); c2.addItem Listener (this); c3.addItem Listener (this); c4.addItem Listener (this); c5.addItem Listener (this);

add(c1); add(c2); add(c3); add(c4); add(c5); }

public void paint (Graphics g)

Java Linux ASP

ST NS Current Selection : Java : True Linux : False ASP : False ST : False NS : False

Vidy

alank

ar>

nts ts

c5,

new FlowLayout( )) FlowLayou Checkbox (“Java” Checkbox (“Ja

new Checkbox (“Lin Checkbox = new Checkbox ( = new Checkbox

c4 = new Checkbo = new Chec c5 = new Check c5 = new Ch

addIted

Prelim Paper Solution

3

{ string a = “Current Selection”; string b = “Java” + c1.getState( ); string c = “Linux” + c2.getState( ); string d = “ASP” + c3.getState( ); string e = “ST” + c4.getState( ); string f = “NS” + c5.getState( );

g.drawString (a, 10, 120); g.drawString (b, 10, 130); g.drawString (c, 10, 140); g.drawString (d, 10, 150); g.drawString (e, 10, 160); g.drawString (f, 10, 170); } public void itemStateChanged (Itemevent ie); { repaint( ); } }

Q.1(b) Explain delegation event model. [5](A) Delegation event model

Delegation event model consist of following three concepts which are used for handling the event : [4 mark] 1) Event Definition : Event is also object.

i) Event is de3fined as the object which describe the state change of the particular source.

ii) Event can be occur on multiple conditions like clicking on a button. Selecting a Checkbox, Scrolling the scrollbars, etc.

2) Source

i) Definition : Source are the objects which generates a particular event.

ii) If we want a particular source should generate a particular event, in that case that source should get registered with a specific event using following method :

addTypeListener (TypeListener tl);

Vidy

alank

arevent ie); nt ie);

model. del. el

del consist of follodel consist of ft :

ion : Event is also : Event is aent is de3fined ent is de3fin particular sticul

an b

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

4

3) EventListeners i) EventListeners are those interfaces which contains different

methods which are used or get override to receive the event and take the corrective action on that event.

ii) ActionListener, ItemListener, MouseListener, etc. are different interfaces which can be used to override their methods.

Event Handling [1 mark] Even the operations which are occurred when the components will get clicked or selected to handle each type of event java develops different event classes. Each event class has its specific condition and when that condition will occur the appropriate event will get generated. When the event will get generated the event object will get throw and to receive that object different receiving method can be used. A component can generated a particular event only when it is registered for that particular event.

Q.1(c) Write a short note on Inner class. [5](A) Inner Class [4 mark]

Example : import java.awt.*; import java.awt.event.*; class testevent extends frame implements ActionListener { testevent( ) { setLayout (new FlowLayout( )); Label l = new Label (“select a color :”); Button b1 = new Button (“Red”); Button b2 = new Button (“Green”); Button b3 = new Button (“Blue”); b1.addActionListener (this); b2.addActionListener (this); b3.addActionListener (this); addWindowListener (new demo ( )); add (l);

Vidy

alank

are ev

eive that th

vent only when it i vent only when

ss.

*;

extends frame im extends frame tener ener

ent( ) nt( )

t (

Prelim Paper Solution

5

add (b1); add (b2); add (b3); setSize (200, 300); setTitle (“SSS”); setVisible (true); }

public void actionPerformed (ActionEvent ae); { String s = ae.getActionCommand( ); Color c1 = new Color (255,0,0); Color c2 = new Color (0,255,0); Color c3 = new Color (0,0,255); if (s.equals (“Red”)) { setBackground (c1); } else if (s.equals (“Green”)) { setBackground (c2); else { setBackground (c3); } } class demo extends WindowAdapter { public void WindowCloasing (WindowEvent we); { System.exit (0); } } public static void main (string a[ ]) { testevent t = new testevent( ); } }

Vidy

alank

ar

Green”)) en ))

ground (c2); round (c2);

setBackgroundsetBackgro } }

emo e

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

6

Inner Class [1 mark] 1) Inner class is used when we want our main class to get derived from

Frame class. 2) In that case we create a new class called as inner class, place it inside

the main class and derived it from the appropriate adapter class, so that we can override a specific method from that adapter class.

Q.1(d) Explain Adapter Class with example. [5](A) Adapter Class [3 mark]

Example : import java.awt.*; import java.awt.event.*;

class testevent extends WindowAdapter implements ActionListener { Frame f; testevent( ) { f = new Frame( ); f.setLayout(new FlowLayout( )); Label l = new Label (“select a color:”); Button b1 = new Button (“Red”); Button b2 = new Button (“Green”); Button b3 = new Button (“Blue”); b1.addActionListener (this); b2.addActionListener (this); b3.addActionListener (this); f.addWindowListener (this); f.add(l); f.add(b1); f.add(b2); f.add(b3); f.setSize (200, 300); f.setTitle (“SSS”); f.setVisible (true); }

Vidy

alank

ar

FlowLayout( )); wLayout( )) Label (“select a coel (“select

b1 = new Button (“ 1 = new Buttoon b2 = new Buttoon b2 = new But

utton b3 = new Button b3 = new Bu

b1.addActionLb1.addA2.addAct

dA

Prelim Paper Solution

7

Public void actionPerformed (ActionEvent ae) { String s = ae.getActionCommand( ); Color c1 = new Color (255,0,0); Color c2 = new Color (0,255,0); Color c3 = new Color (0,0,255); if (s.equals (“Red”)) { f.setBackground (c1); } else if (s equals (“Green”)) { f.setBackground (c2); } else { f.setBackground (c3); } } Public void WindowClosing (WindowEvent we) { System.exit (0); } Pubic Static void main (String a[ ]) { test event t = new testevent( ); } }

Adapter Class [2 mark] 1) Adapter class is used to overcome the problem of writing different

methods of empty implementation. 2) Normally if we use event listener, then we need to override all its

methods. 3) If we want to override only certain specific method, then in that case

EventListener can be replaced with EventAdapter Class.

Vidy

alank

ar c3);

ndowClosing (WindClosing (W

tem.exit (0); tem.exit (0)

bic Static void c Static

ev

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

8

EventClass EventListener EventAdapter Class ActionEvent ActionListener ActionAdapter ItemEvent ItemListener ItemAdapter MouseEvent MouseListener MouseAdapter KeyEvent KeyListener KeyAdapter ComponentEvent ComponentListener ComponentAdapter ContainerEvent ContainerListener ContainerAdapter AdjustmentEvent AdjustmentListener AdjustmentAdapter TextEvent TextListener TextAdapter WindowEvent WindowListener WindowAdapter MouseWheelEvent MouseWheelListener MouseWheelAdapter

Q.2 Attempt the following (any TWO) [10]Q.2(a) Differentiate between AWT component and Swing Component. [5](A)

AWT Components Swing Components 1) AWT components are non java

components Swing components are pure java components

2) They are platform dependent components

They are platform independent components

3) They are non decorative components They are decorative. We can even place an image on a component

4) They are normally rectangular in shape

We can create different shape components

5) Those are considered as heavy weight components

Those are considered as light weight components

6) They are not used to perform complex operations

They are used to perform complex operations

7) Those classes are present in java.awt package

Those classes are present in javax.swing package

Q.2(b) Explain JOptionPane in detail. [5](A) JOptionPane

1) It is use to create Option Pane or pop-up messages in case of swing. [1 mark]

2) It provides different static methods which are use to display different pop-ups. [4 mark] (a) ShowMessageDialog (Parent Window Object, String message) It is used to create a simple popup message with "OK" button.

V are Vidy

ala components Themponents Talank

ar Swing Compong Com

Swing Swing Comkaa Swing componeSwing compcomponents componenkaanendent endent They arThey

componcomananalaaally rectangular ily rectangularyae considered as considered as

omponents omponents idyare not used re not erations tionViV

Prelim Paper Solution

9

(b) ShowConfirmDialog(String message); It is used to display a confirmation message with 3 buttons "YES",

"NO" and "CANCEL". (c) ShowInputDialog(String message);

It is used to display a pop-up which is used to accept an input from the users

Q.2(c) Write a program to create a combobox, and add different items in

that combobox by accepting them from user. [5]

(A) import java.awt.*; import java.awt.event.*; import javax.swing.*; class combo extends JFrame implements ActionListener { JComboBox jc; JButton jb; JTextField jt; combo() { Container c=getContentPane(); c.setLayout(new FlowLayout());

OK

Message

Yes

Message

No Cancel

OK

Message

Cancel

Vidy

alank

are);

to display a pop-u display a pos s

program to create program to cobox by accepbox by

wt.*; eve

aaaa

yalan

k

yalan

k

yal

yalK

sage

lalalanlan

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

10

jc=new JComboBox(); jb=new JButton("Add"); jt=new JTextField(10); jb.addActionListener(this); c.add(jc); c.add(jt); c.add(jb); setSize(500,500); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent ae) { String s=jt.getText(); jc.addItem(s); } public static void main(String args[]) { combo cb=new combo(); } }

Q.2(d) Write a program to create a table and perform addition and removal

of rows by accepting row no, using 2 buttons "Add" and "Remove". [5]

(A) import java.awt.*; import javax.swing.*; import java.awt.event.*; import javax.swing.table.*; class table extends JFrame implements ActionListener { JScrollPane jsp; DefaultTableModel dt; JTable j; JButton jb1,jb2; table()

Vidy

alank

arLOSE); E);

e)

ng args[]) gs[])

);

program to create program to cr accepting row acceptin

wt.*; ng

Prelim Paper Solution

11

{ Container c=getContentPane(); c.setLayout(new BorderLayout()); jb1=new JButton("Add Row"); jb2=new JButton("Remove Row"); String data[][]={{"1","sss","dadar"},{"2","akn","sion"},{"3","sdw","thane"}}; String colheads[]={"Id","Name","Address"}; dt=new DefaultTableModel(data,colheads); j=new JTable(dt); jsp=new JScrollPane(j); jb1.addActionListener(this); jb2.addActionListener(this); c.add(jsp,BorderLayout.CENTER); c.add(jb1,BorderLayout.NORTH); c.add(jb2,BorderLayout.SOUTH); setSize(1000,500); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent ae) { String s=ae.getActionCommand(); if(s.equals("Add Row")) { String a=JOptionPane.showInputDialog("Enter row number"); int m=Integer.parseInt(a); String b=JOptionPane.showInputDialog("Enter Id"); String c=JOptionPane.showInputDialog("Enter Name"); String d=JOptionPane.showInputDialog("Enter Address"); String e[]={b,c,d}; dt.insertRow(m,e); } else { String f=JOptionPane.showInputDialog("Enter row number to be deleted");

Vidy

alank

arH); H);

ation(JFrame.EXITJFrame.E

onPerformed(ActionPerformed(Ac

ae.getActionCommaae.getActionC

dd Row")

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

12

int n=Integer.parseInt(f); dt.removeRow(n); } } public static void main(String args[]) { table t=new table(); } }

Q.3 Attempt the following (any TWO) [10]Q.3(a) Explain RequestDispatcher with example. [5](A) RequestDispatcher [ 2 mark]

<html> <head> <title> Servlet Application </title> </head> <body> <form method = "post" action = "test"> <b> Username </b> <input type = "text" name = "u" value = " " size = "10"> <input type = "password" name = "p" value = " " size = "10"> <input type = "submit" value = "login"> </form> </body> </html> //test.java import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class test extends HttpServlet { public void doPost(HttpServletRequest Request, HttpServletResponse Response) throws IOException ServletException

username :

password :

Login

Vidy

alan

n </title> </head> title> </he

ost" action = "testt" action = "tb> b

"text" name = "u" text" name = "u" e = "password" name = "password = "submit" va = "subm

anka

r

ank

anka

rarkakakar

Login

anka

r

Prelim Paper Solution

13

{ response.setContentType("text/html?); PrintWriter out = response.getWriter( ); String n = request.getParameter("u"); String p = request.getParameter("p"); out.print ln("H \ "); if((n.equals("admin")) && (p.equals("admin"))) { RequestDispatcher rd1 = request.getrequestDispatchers ("Welcome"); rd1.include(request, response); } else { RequestDispatchers rd2 = request.getRequestDispatchers ("Errors"); rd2.forward(request, response); } out.close( ); } } Request Dispatchers [2 mark] 1) Any Servlet application can be created as a request dispatcher by using

following method getRequestDispatcher( ); 2) RequestDispatchers is a class which is there inside the package

javax.servlet 3) RequestDispatcher can be created for following 2 reasons. (a) To include the contains of RequestDispatcher into the current

Servlet application for that purpose we are using include( ); of RequestDispatcher.

(b) To forward the control from current servlet application to any requestDispatcher servlet. For that purpose we are using forward( ); of RequestDistpacher.

Q.3(b) Explain session management with its techniques. [5](A) Session management techniques

1) Session Management is used by Servlet to store information about a particular client.

Vidy

alank

aruest.getRequest.getRequ

forward(request, rward(reques

pplication can be cication can b

ethod ethod equestDispatcher( questDispatcher(

stDispatchers is stDispatcherervlet ervlet

spatchede

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

14

2) When a new client sends a request for a Servlet, Servlet will create a session Memory to store a transaction information about a that particular client.

3) Apart from that Servlet also generate a Session ID to keep a trap for that session Memory.

4) Servlet Sends the SessionID to the client side. Application which will get stored inside the client machine.

5) Next time if the Same client wants to do the transaction with the same Servlet, then client will send request packet with session ID.

6) By retrieving the session ID, Servlet updates Session Memory for new transaction generater new SessionID & send it to the client.

7) To perform this mechanism following three techniques can be used. (a) Hidden formField :

It is used by the client to send a Session ID to the Servlet. It is in Hidden form & only Servlet can read it & Hence called as

Hidden form field. (b) Url rewriting :

It is used to send SessionID to the client. Servlet can put the SessionID inside response packet or it will

generate a special token to send a SessionID (c) Cookies :

By using cookie, a Servlet an send SessionID to the client machine.

For that purpose Servlet will create a new cookie for Session ID & sends it to the client, with the help of response packet Header.

For example, Write a program to create a client side application which is used to accept Roll No. and Name from user. It should also have a button named "display" which when clicked should send those value to the servlet. Servlet application should accept them display them on web browser. client side application <html> <head> <title> Servlet Application </title> </head> <body>

Roll No. :

Name :

Display

Vidy

alank

arsion ID to ID

et can read it & an read it

nID to the client. to the clie SessionID inside rsionID insi

token to send a Se oken to send

okie, a Servlet a a Servl

t purpose Servlet purpose Servds it to the client, ws it to the client

e, rogram to create rogram to cr

Name from Name licked

Prelim Paper Solution

15

<form method = "get" action = "test"> <b> Roll No. </b> <input type = "number" name = "r" value = " " size = "10"> <b> Name </b> <input type = "text" name = "n" value = " " size = "10)> <input type = "submit" value = "Display"> </form> </body> </html>

server side application import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class test extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, Servlet Exception { res.setContentType("text/html"); PrintWriter pw = res.getWriter( ); int roll = Integer.parseInt(req.getParameter("r")); String name = req.getParameter("n"); pw.println ("The roll no. =" + roll); pw.println("<br>"); pw.println("The name =" + name); HttpSession hs = req.getSession(true); if(hs.isNew( )) { pw.println("Session is new"); } else { pw.println("session is old"); pw.println("session id =" + hs.getId( )); pw.println("Creationtime =" + hs.getId( )); pw.println("Lastaccessed time =" + hs.getLastAccessedTime"); } pw.cloase( ); } }

Vidy

alank

art req, HttpServlet req, HttpSeret Exception Exception

xt/html"); html"); getWriter( ); etWriter( );

arseInt(req.getPaeInt(req.ge eq.getParameter("getParamet

The roll no. =" + roThe roll no. =" +n("<br>"); br>");

ntln("The name =" +ntln("The name ="pSession hs = req.ession hs = r

(hs.isNew( )) hs.isNew( ))

printl

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

16

Q.3(c) Develop simple servlet question-answer application to demonstrate use of HttpServletRequest and HttpServletResponse interfaces.

[5]

(A) //index.jsp <html> <head> <title>Welcome To SSS's Quiz Contest</title> </head> <body> <h1 align="center">Welcome To SSS's Quiz Contest</h1> <form method="post" action="test"> <b>Who developes Java</b> <br> <input type="radio" name="java" value="d">Dennis Ritchie <input type="radio" name="java" value="b">Bjarne Straunstrup <input type="radio" name="java" value="j">James Goslin <br> <input type="submit" value="Submit"> </form> </body> </html>

//test.java import java.io.*; import javax.servlet.*; import javax.servlet.http.*;

public class test extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); try { String answer=request.getParameter("java"); if((answer.equals("d"))||(answer.equals("b"))) { out.println("Wrong Answer"); } else

Vidy

alank

arenn

">Bjarne Sarne="j">James Gosl>James G

mit"> t">

t.*; *; vlet.http.*; vlet.http.*;

test extends Httpst extends H

id doPost( doP

Prelim Paper Solution

17

{ out.println("Correct Answer"); } } finally { out.close(); } } }

Q.3(d) Develop servlet application of basic calculator (+, , *, /) using HttpServletRequest and HttpServletResponse.

[5]

(A) //index.jsp <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSP Page</title> </head> <body> <form method="post" action="calculate"> <h1>Simple Calculator</h1> <hr> <b>Enter First Number</b> <input type="number" name="n1" value="" size="2"> <p> <b>Enter Second Number</b> <input type="number" name="n2" value="" size="2"> <p> <b>Enter Operation</b> <input type="text" name="op" value="" size="2"> <p> <input type="submit" value="Calculate"> </form> </body> </html> //calculate.java import java.io.*; import javax.servlet.*; import javax.servlet.http.*;

Vidy

alank

ar content="text/htmtent="text/

action="calculate"> n="calculator</h1> h1>

Number</b> Number</b> e="number" name="="number" name

ter Second Numbter Second N type="number type="n

per

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

18

public class calculate extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); try { int a=Integer.parseInt(request.getParameter("n1")); int b=Integer.parseInt(request.getParameter("n2")); String op=request.getParameter("op"); int c; if(op.equals("+")) { c=a+b; } else if(op.equals("-")) { c=a-b; } else if(op.equals("*")) { c=a*b; } else { c=a/b; } out.println("The Result is "+c); } finally { out.close(); } } }

Vidy

alank

ar

"*")) )

a/b; /b;

n(

Prelim Paper Solution

19

Q.4 Attempt the following (any TWO) [10]Q.4(a) Write a program using Prepared Statement to add record in student

table containing roll number and name. [5]

(A) import java.sql.*; public class Main { public static void main(String[] args) { try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection c = DriverManager.getConnection("jdbc:odbc:sss"); PreparedStatement ps=c.prepareStatement("insert into student values(?,?)"); ps.setInt(1,10); ps.setString(2,"SSS"); ps.execute(); ps.close(); c.close(); } catch(Exception e) { System.out.println("Exception occur"); } }

} Q.4(b) Explain character quoting convention in JSP [5](A) Character Quoting Conventions

Because certain character sequences are used to represent start and stop tags, the developer sometimes need to escape a character so the JSP engine does not interpret it as part of a special character sequence. In scripting element, if the characters %> needs to be used, escape the greater than sign with a backslash: <% String message = “This is the %\ message” ; %> The backslash before the expression acts as an escape character, informing the JSP engine to deliver the expression verbatim instead of evaluating it.

Vidy

alank

arn( j

ment("inset("i

println("Exceptionrintln("Excep

cter quong

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

20

There are a number of special constructs used in various cases to insert characters that would otherwise be treated specially, they are as follows :

Escape

CharactersDescription

\ ' A single quote in attribute that uses single quotes. \ '' A double quote in an attribute that uses double quotes. \ \ A backslash in an attribute that uses backslash.

% \ > Escaping the scripting end tag with a backslash. < \ % Escaping the scripting start tag with a backslash. \ $ Escaping the dollar sign [dollar sign is used to start an EL

expression] with a backslash

Example <% String message = ‘Escaping \’ single quote’; %> <% String message = ‘Escaping \’ double quote’; %> <% String message = ‘Escaping \ \ backslash’; %> <% String message = ‘Escaping % \ > scripting end tag’’; %> <% String message = ‘Escaping < \ % scripting start tag’’; %> <% String message = ‘Escaping \$ dollar sign” ; %>

As an alternative to escaping quote characters, the character entities &apos; and &quot; can also be used.

Q.4(c) Explain transaction in JDBC. [5](A) c.setAutoCommit (false);

s.execut("insert into employ value ) s.execut("delete from employ ) s.executUpdate("update employ ) c.commit( ); ResultSet rs = s.executeQuery("select * from employee"); i) In case of JDBC the default value of commit protocol is true. ii) Which means all the transaction will get perform in the same order as

they are written in the JDBC application. iii) We can make the value of commit protocol as false with the help of

following method c.setAutoCommit (false); iv) It means all the transaction written after this will be kept hold and only

will get performed when we called the commit protocol. v) All the transaction because of this will execute simultaneously at a same

time.

Vidy

alank

are quote’; %> uote’; %> ouble quote’; %> ouble quote’; %

\ \ backslash’; %> backslash’; %ng % \ > scripting e % \ > script

aping < \ % scriptinng < \ % scr Escaping \$ dollar sscaping \$ dol

caping quote chaing quote also be used. be used.

ion in JDBC. in JDBC. mit (false); mit (false

nsert into employ nsert into empdelete from emdelete from

ate("updat("up

Prelim Paper Solution

21

vi) The major problem of using this transaction mechanism is that when 2 operations will get perform on the same record, sometime it will generate deadlock condition.

vii) To overcome this deadlock transaction mechanism uses rollback concept. viii)Because of rollback all the transaction will get undone and the operation

will get nullified.

Q.4(d) Explain life cycle of JSP. [5](A) LIFECYCLE OF JSP

1) Instantiation : When a web container receives a JSP request, it checks for the JSP’s servlet instance. If no servlet instance is available then the web container creates the servlet instance using following steps. (a) Translation :

Web container translates (converts) the JSP code into a servlet code.

After this stage there is no JSP everything is a servlet. The resultant is a java class instead of an html page (JSP page) (b) Compilation : The generated servlet is compiled to validate the syntax. The compilation generate class file to run on JVM. (c) Loading :

The complied byte code is loaded in web container i.e. Web server.

(d) Instantiation:

In this step, instance of the servlet class is created, so that it can handle request.

RequestIf not

initialized

Response

Translation Compilation Loading

Initialization Instantiation

Request Processing

Destruction

Already Initializ

Client Vidy

alank

ar

s) the JSP c he JSP

JSP everything is aSP everything ss instead of an ht nstead of a

et is compiled to v s compiled t enerate class file nerate class

ed byte code is byte code

VidRequestues

ViVidyIf not If not

initializediniti

Viy

Vidy

VV

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

22

(e) Initialization : It can be done using jspInit( ). This is one time actively and after

initialization, the servlet is ready to process requests.

2) Request Processing : Entire initialization process is done to make the servlet available in order to process the incoming request.

jspService( ) is the method that actually process the request.

3) Destroy : Whenever the server needs memory, the server removes the instance of the servlet.

The jspDestory( ) can be called by the server after initialization and before or after request processing.

Q.5 Attempt the following (any TWO) [10]Q.5(a) Explain JSF life cycle. [5](A) JSF life cycle

JSP lifecycle consist of following phases 1. Restore view :

i) In this face the appropriate view are created for a particular request and will get sotre in “Facescontext” object.

ii) Also different component will get retrieve from webserver and component tree can be generated.

2. Apply request values i) In this the local values of the components will get changed with the

request value i.e. request will get apply on component tree.

Restore view

Apply request values

Process event

Process Validation

Process event

Response complete

Response complete

Render response

Response complete

Faces response

Invotie application

Process Event

Update model values

Faces response

Reader response

Response complete

Process Event

Conversion error/render

Validation error /response

Vidy

alank

ar

alan

alancess

event nn

e plete

VVe

e

yal

ResRespponse comonse co plete

dyVid

a

ViVid

Vidyrocess

VConvers

nka

Prelim Paper Solution

23

ii) If any error occur then the error message will get store inside “Facescontext” object.

3. Process validation i) In this the local values of the component will get checked with the

validation rule registered for a components. ii) If the rules does not match then the error message will get render

to a client. 4. Update model values

i) In this face the components from component tree will update the component present inside the webserver.

ii) It is also called as baching a bear. 5. Invest application

i) In this face the application will get invest or execute to create responses.

ii) Also if they are multiple pages then lintsing of those page will also get done in this phase.

6. Render response In this phase the generated responses will get render i.e. provided to a client as a response.

Q.5(b) Explain advantages of EJB. [5](A) Advantages of EJB Apart from platform independent, EJB has following advantages.

More focus on business logic : In industry because of use EJB the development time of on application can be reduce, so that the organization can able to more focus on business logic.

Portable Components : EJB components creted inside one web server can be used in another web server.

Reusable component : We can create on EJB only once and by storing it inside the web server we can use it multiple time.

Reduces execution time: As EJB component are readymade component the user need not to create this component every time, which reduces overall execution time.

Distributed deployment: EJB’s can be sue in distributed architecture where the EJB’s can get store in multiple system in distributed manner.

Interoperability : EJB’s can be use by multiple types of request, because the EJB has concept of CORBA (common object request brother architecture) which converts different type of request into common format.

Vidy

alank

arst o

lintsing of thostsing of t

ponses will get reses will get

.

independent, EJB endent, En business logic : business log

t time of on at time of on tion can able to moon can able to mo

ble Components : Eble Componend in another we in anot

componeb

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

24

Q.5(c) Explain different types of EJB’S. [5](A) (i) Session bins

Session bins are the beans which can requested by particular client i.e. they can perform their work only after getting the client request. Characteristic of session bean (1) They are short live beans (2) They are transaction oriented (3) They cannot be created by using a data from database, but they

have the ability to make changes in database. (4) They can be stateful or stateless bean. (5) They are synchronous in nature. (6) They can be accessed with the help of home interface. Types of session bean (1) Statefull session bean

Those are the bean which is use to store the conversational information between the client & server for that they maintain a state in which they can store the information. Because of that state, the processing of this bean are slower.

(2) Stateless session bean

Those are the bean which is not use to store the conversational information between the client & server for that they not maintain a state which they can Because of that.

(3) Singleton Session bean

This bean are requested by multiple client simultaneously.

(ii) Message driven bean Message driven bean can be use by generating the appropriate event or a message by java messaging system. Characteristics (1) They are short live beans (2) They are transaction oriented. (3) They cannot be created by using a data from database, but they

have the ability to make changes in database. (4) They are stateless. (5) They are asynchronous. (6) They does not use any home interface.

Vidy

alank

are int

s use to store use to storent & server for & server

ore the informatioe the inform bean are slower. bean are slowe

n bean an e bean which is an which

n between the clie between the hich they can Becahich they can Be

ngleton Session bengleton Sessis bean are reqs bean a

ve

Prelim Paper Solution

25

Q.5(d) Write a program to create a login application using JSF with builtinvalidation.

[5]

(A) //index.xhtml <?xml version='1.0' encoding='UTF-8' ?> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <h:head> <title>Login</title> </h:head> <h:body> <h:form> <h1>The Login Form</h1> <h:outputLabel for="txtName"> <h:outputText value="Name" /> </h:outputLabel> <h:inputText id="txtName" value="#{user.name}"> <f:validateRegex pattern="[a-z]+"/> </h:inputText> <h:outputLabel for="txtPassword"> <h:outputText value="Password" /> </h:outputLabel> <h:inputSecret id="txtPassword" value ="#{user.password}"> <f:validateRegex pattern="(.{6,20})" /> </h:inputSecret> <h:commandButton value="Login" action="#{user.verifyUser}"/> </h:form> </h:body> </html> //userbean.java import javax.faces.bean.*; @ManagedBean(name="user") public class userbean

Vidy

alank

ar" value="#{user.na alue="#{use

rn="[a-z]+"/> n="[a-z]+"/>

l for="txtPassword="txtPasswext value="Passworxt value="Pass

utLabel> utLabel>

:inputSecret id=":inputSecret tvalidateRegex alidateR

putSecre

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

26

{ String name; String password; public void setname(String n) { name = n; } public String getname() { return name; } public void setpassword(String p) { password = p; } public String getpassword() { return password; } public String verifyUser() { if(name.equals("admin") && password.equals("sssssss")) { return "success"; } else { return "failure"; } } }

Vidy

alank

arord() )

rd;

String verifyUser()ring verifyUser()

me.equals("adme.equals

ess

Prelim Paper Solution

27

Q.6 Attempt the following (any TWO) [10]Q.6(a) Explain MVC architecture. [5](A) MVC architecture

1. MVC architecture is normally use to create multiple views of the same application.

2. The basic intention of MVS is to separate application logic with presentation logic.

3. The architecture of MVC contains following 3 components. Model: It represent a data or collection of multiple data use in MVC. e.g. database

View: It is the component which is responsible for creating multiple views of the some application.

e.g. jsp Controller: This component is sue to control model as well as view.

e.g. Servlet 4. Working

i) Whenever on event will occur for the use of MVC architecture, the event or the request has been accepted by controller.

ii) Controller forward that request to model component, where model component retrives the appropriate date use for handling the data and send that data to controller.

Controller forwards that data to view which will create multiple views from that data. Sometimes the data accepted by view is not sufficient to create the multiple views in that case view can directly interact with model for getting that additional data.

Event

Controller

View

Model

Vidy

alank

ar to create multiple create mult

S is to separat is to sep

C contains followinntains folloent a data or colle a data or

the component wh he componen the some applicat the some applic

sp p ntroller: This comntroller: This. Servlet Servlet

r

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

28

Q.6(b) Explain any 3 core components of struts framework. [5](A) Core Components of struts Framework

1. Struts Framework is use to support MVC architecture and hence 3 components of struts are resemble with MVC architecture.

i) Filter dispatcher will behave like controller ii) Action will work as Model iii) Result and Result type will work as a view Struts framework contain following core component

i) Filter dispatcher: It behave like controller which is use to accept request from the client.

Once it accept the request it will search an appropriate action component to forward the request.

For selecting a particular action component, “Struts.xml” helps Filterdispatcher.

Once it identifies apprompriate action, Filterdispatcher invoke the action by sending the request.

ii) Action: Action will behave like model and hence it has the appropriate dta use to crete multiple views.

Q.6(c) Explain Structure of hibernate.cfg.xml file (Hibernate configuration

file). [5]

(A) <?xml version=”1.0” encoding=”UTF 8”?>

<hibernate configuration> <session factory> <property name=”hibernate.dialect”> org.hibernate.dialect.MySQLDialect</property>

Filter dispatcher

Action

http request

Invokereturn

Result

dispatchers

Struts Xml Client

Interception

Reads configurator

Vidy

alank

ar architecchit

MVC architecturC architec ontroller ontroller

ork as a view as a view owing core componng core co

behave like contro behave like coent.

the request it w request forward the requeard the re

ing a particular g a particuspatcher. spatcher.

it identifies appr t identifies apprtion by sending thtion by sendition: Action on: Ac

priate dt

Prelim Paper Solution

29

property name=”hibernate.connection.driver_class”> com.mysql.jdbc.Driver</property> <property name=”hibernate.connection.url”> jdbc:mysql://localhost/DBname</property> <property name=”hibernate.connection.username”> root</property> <property name=”hibernate.connection.password”> root</property> <mapping resource=”guestbook.hbm.xml”/> </session factory> </hibernate configuration> Elements: hibernate.dialect It represents the name of the SQL dialect for the database hibernate.connection.driver_class It represents the JDBC driver class for the specific database hibernate.connection.url It represents the JDBC connection to the database hibernate.connection.username It represents the user name which is used to connect to the database hibernate.connection.password It represents the password which is used to connect to the database

guestbook.hbm.xml It represents the name of mapping file

Vidy

alank

ar the name of the name of

r_classass It repre It r

ion.urlion.url It represe It repr

onnection.usernamonnection.use he database e datab

on

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

30

Q.6(d) Explain hibernate architecture in detail. [5](A)

(1) The working of hibernate will state when persistent object i.e. POJO has been created by the java application.

(2) Hibernate layer is divided into following different object which are use to perform different operation.

(i) Configuration : (i) This object is used to establish a connection with the database. (ii) It contains following 2 files

(a) hibernate. properties it is use to give some additional information about the hibernate layer.

(b) hibernate (f.g. xml It is use to establish a connection with a particular database.)

(iii) Configuration object is also use to create session factory.

(ii) Session factory : (a) As the name suggest session factory is use to create different

session objects. (b) Session factory will created only once, but to perform multiple

operation it will create multiple session object.

(iii) Session : It is generally use to receive a persistent object inside the

hibernate layer. Session object is responsible to create transaction object & perform

appropriate operation on persistent object.

Fig. 1

Vidy

alank

arte when persistent when persist

cation. n. nto following diff nto following

eration. tion.

s used to establish s used to estas following 2 files ollowing 2

ernate. propertieernate. propertinformation about ormation ab

) hibernate (f.g. ) hibernate (particular darticul

ration

Prelim Paper Solution

31

(iv) Transaction : It is the optional object which is use to represent unit of work. It represent the starting & ending of the transaction on database.

(v) Query : (i) If we want to perform operations on database using SQL or hQl

queries, then in that case session object create query object.

(vi) Criteria : If we want to perform operations on database using java methods then in that case session create criteria object.

Q.7 Attempt the following (any THREE) [15]Q.7(a) Write a program to implement single arithmetic calculator using awt

components. [5]

(A) import java.awt.*; import java.applet.*; import java.awt.event.*; /*<applet code=e5 width=200 height=300> </applet>*/ public class e5 extends Applet implements ActionListener { Label l1,l2; Button b1,b2,b3,b4; TextField t1,t2,t3; public void init() { setLayout(new FlowLayout()); l1=new Label("Number 1"); l2=new Label("Number 2"); b1=new Button("Add"); b2=new Button("Sub"); b3=new Button("Mul"); b4=new Button("Div"); t1=new TextField(10); t2=new TextField(10); t3=new TextField(10);

b1.addActionListener(this); b2.addActionListener(this); b3.addActionListener(this); b4.addActionListener(this);

calcc

t=300> 00>

t implements Actio implements A

; )

(new FlowLayout((new FlowLayel("Number 1""Numb

NumbeAd

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

32

add(l1); add(t1); add(l2); add(t2); add(b1); add(b2); add(b3); add(b4); add(t3); } public void actionPerformed(ActionEvent ae) { String s=ae.getActionCommand(); int n1=Integer.parseInt(t1.getText()); int n2=Integer.parseInt(t2.getText()); int n; if(s.equals("Add")) { n=n1+n2; } else if(s.equals("Sub")) { n=n1-n2; } else if(s.equals("Mul")) { n=n1*n2; } else { n=n1/n2; } Integer I=new Integer(n); String p=I.toString(); t3.setText(p); } }

Vidy

alank

ar

als("Mul")) s("Mul"))

Prelim Paper Solution

33

Q.7(b) Write a program to meate a split pane in which left side of splitRane contains a list of plants and when user clicks on any planetname, its image should get displayed an right side.

[5]

(A) import javax.swing.*; import java.awt.*; import javax.swing.event.*; class list extends JFrame implements ListSelectionListener { JSplitPane jsp; ImageIcon i1,i2,i3; JList jl; JLabel j; list() { Container c=getContentPane(); c.setLayout(new FlowLayout()); String s[]={"earth","mercury","saturn"}; jl=new JList(s); jl.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); i1=new ImageIcon("earth.jpg"); i2=new ImageIcon("mercury.png"); i3=new ImageIcon("saturn.jpg"); j=new JLabel(i1); jsp=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT); jsp.setLeftComponent(jl); jsp.setRightComponent(j); jl.addListSelectionListener(this); c.add(jsp); setSize(500,500); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }

Vidy

alank

arturn"}; n"};

ectionModel.SINGonModel.S

rth.jpg"); pg"); ("mercury.png"); mercury.png")

on("saturn.jpg"); on("saturn.jpg")

bel(i1); bel(i1);

tPane(JS

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

34

public void valueChanged(ListSelectionEvent ls) { String p=(String)jl.getSelectedValue(); if(p.equals("earth")) { j.setIcon(i1); } else if(p.equals("mercury")) { j.setIcon(i2); } else { j.setIcon(i3); } } public static void main(String args[]) { list l=new list(); } }

Q.7(c) Explain CGI and its woring. Also wirte disadvantages of CGI. [5](A)

(i) CGI : Common gateway interface is responsible to provide dynamic

response in case of Three tire architecture. (ii) Working :

When webserver accept request which require dynamic response web server forward the request to CGI.

CGI is a program which accept the request & to handle that request create CGI. Process & load that process inside the web server.

Now that process is responsible to provide dynamic response to the client.

Client CGI web

Server

DB Server

http reg.

http res Vidy

alank

ar

woring. Also wirteg. Also w

Vientnt

yidyVidhttp reg.http reg.

http reht

Prelim Paper Solution

35

Once this can be done web server destroy the process to free its memory.

(d) Three-tier architecture

(i) In this there exist three entity i.e. client, webserver & Database server.

(ii) Basically here server get distributed in web server & database server.

(iii) Web server is responsible to interact with client as well as database server.

(iv) Although this architecture minimize performance delay it has following disadvantage.

(v) Disadvantage (i) Single point failure can occure if the webserver get failed. (ii) This architecture does not use to provide dynamic response.

(vi) Disadvantage CGI process are platform dependent process because they are

implemented in C, C++ pearl. It increase the overhead of webserver because every time a new

process get loaded & unloaded from web server. It is very difficult to implement CGI programming.

Lack of scalablity if the number of client will get increase. Lack of security. It uses lots of webserver resources. Only one resource can be use at a time i.e. lack of resource

sharing. Q.7(d) Write a program to demonstrate use of JMenuBar, JMenu and

JMenuItem class in swing. [5]

(A) import javax.swing.*; import java.awt.*; import java.awt.event.*; class notepad2 extends JFrame implements ActionListener

DB Server

Clientweb

Server

http reg

http res

Vidy

alank

ar in web se web

ract with client asract with clien

e minimize perf minimize

lure can occure if e can occureecture does not usere does not

e e rocess are platfocess are p

plemented in C, C++plemented in C, C+It increase the ov increase theprocess get loaprocess getIt is very di is ver

k of s

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

36

{ JMenuBar jm; JMenu jm1,jm2; JMenuItem m1,m2,m3,m4,m5,m6;; JTextArea jta; JScrollPane jsp; notepad2() { Container c=getContentPane(); c.setLayout(new BorderLayout()); jm=new JMenuBar(); jm1=new JMenu("File"); jm2=new JMenu("Edit"); m1=new JMenuItem("New"); m2=new JMenuItem("Open"); m3=new JMenuItem("Save"); m4=new JMenuItem("Exit"); m5=new JMenuItem("Foreground"); m6=new JMenuItem("Background"); jm1.add(m1); jm1.add(m2); jm1.add(m3); jm1.add(m4); jm2.add(m5); jm2.add(m6); jm.add(jm1); jm.add(jm2); jta=new JTextArea(); jsp=new JScrollPane(jta); m1.addActionListener(this); m2.addActionListener(this); m3.addActionListener(this); m4.addActionListener(this); m5.addActionListener(this); m6.addActionListener(this);

Vidy

alank

arnd"); nd");

round"); d");

m6); m6);

Prelim Paper Solution

37

c.add(jm,BorderLayout.NORTH); c.add(jsp,BorderLayout.CENTER); setSize(500,500); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent ae) { String s=ae.getActionCommand(); if(s.equals("New")) { jta.setText(""); } else if(s.equals("Open")) { JFileChooser jf1=new JFileChooser(); jf1.showOpenDialog(null); } else if(s.equals("Save")) { JFileChooser jf2=new JFileChooser(); jf2.showSaveDialog(null); } else if(s.equals("Exit")) { dispose(); } else if(s.equals("Foreground")) { JColorChooser jc1=new JColorChooser(); Color c1=jc1.showDialog(null,"Select Foreground",null); jta.setForeground(c1); } else { JColorChooser jc2=new JColorChooser(); Color c2=jc2.showDialog(null,"Select Foreground",null); jta.setBackground(c2); }

Vidy

alank

ar;

JFileChooser(); eChooser(g(null); null);

als("Exit")) s("Exit"))

Fo

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

38

} public static void main(String args[]) { notepad2 n=new notepad2(); }

} Q.7(e) Explain different types of JSP tags. [5](A) JSP tags / JSP elements

JSP tags are normally use to embed java code inside the JSP page. Following are various type of JSP tags (A) Directive tag

It has three types (a) Page directive tag

It is use to perform those operation which can be operated through out the JSP page. e.g.: <% @ page import = “java.10*” %> <% @ page session = “true”%> <% @ Page language = “java”%> <% @ Page content Type = “text/html”%>

(b) Include directive tag :

It is use to include the contents of one JSP application inside the current JSP application. e.g. <%@ include file = “abc.jsp” %>

(c) taglib directive tag :

Inside the JSP application, if we want to use some other tag apart from html & JSP then the tag server or the tag library can be be included using taglib directive tag. e.g.: <%@taglib uri = “www.w3.org”%>

(d) Declaration tag

It is use to declare a particular variable inside the JSP application. e.g. <%! int a = 2; %>

Vidy

alank

ar which can be opera which can be o

%> %> %>

ava”%> %> ype = “text/html”% = “text/h

ve tag : e tag : o include the con o include the

JSP application. SP application

clude file = “ablude file

ve

Prelim Paper Solution

39

(e) Expression tag It is use to display the value of a particular variable or an expression on a web browser. e.g. <% = a%>

(c) Script let

It is use to write java code as it is inside the JSP page as it is written in java application. e.g. <%

___ ___ java code ___

>

(d) Comment tag It is use to write comment inside jsp page. A comment is non executable statement which is use to provide some additional information about the some instruction. e.g. <% comment %>

Q.7(f) Explain structure of hibernate mapping file. [5](A) <?xml version=”1.0” encoding=”UTF 8”?>

<hibernate mapping>

<class name=”guestbook” table=”guestbooktable”>

<property name=”name” type=”string”> <column name=”username” length=”50” /> </property>

<property name=”message” type=”string”> <column name=”usermessage” length=”100” /> </property>

</class>

</hibernate mapping>

Vidy

alank

are jsp page. A commp page. A c

ovide some additioe some add

%>

of hibernate mapf hibernate m1.0” encoding=”UT1.0” encoding=”U

mapping> apping>

ame=”guestboome=”gue

am

Vidyalankar : T.Y. B.Sc. (IT) – Adv. Java

40

Elements: <hibernate mapping>….......</hibernate mapping> It is the base tag which is used to write hibernate mapping file, which is used to map POJO class with database table.

<class>….......</class> It represents name of the class and database table which we want to map with each other. It has 2 parameters: name It represents name of the class table It represents name of the database table <property>….......</property> It is used to write the property which we want to map with database column. It has 2 parameters: name It represents name of the property type It represents type of the property

<column>….......</column> It is used to write the database column which we want to map with java class property. It has 2 parameters: name It represents name of the column length It represents maximum length of a column value

Vidy

alank

ar map

column which we wamn which w

of the column e column aximum length of aum length