Java Paper Solutions With Questiosn Included

Java Paper Program Solutions from May 2009 to May 2012 (Mumbai Univ)

(Siddhiraj Pantoji , Hiray Collge , Bandra E ), Revision 1

Created By : Siddhiraj Ramesh Pantoji [ Hiray College, Bandra(East) ] Contact : [email protected]

This File contains only codes or Programs for Java Paper most of the questions I have been able

to cover.

Only revised Syllabus from May 2009 onwards

Dedicated to My Parents and Teachers of Hiray College

Hope you Guys find this useful in Java .

This version includes questions with solutions

Year : May 2009

Q1) b )Write a java program that enables the user to enter base and exponent through

keyboard.In that write a recursive method power (base,exponent ). That when invoked

returns baseexponent

For eg , power (3,4) =3*3*3*3. Assume that exponent is an integer

greater that or equal to 1

import java.util.*;

public class Recursion

{

double power (int a,int b)

{

if(b==1)

return a;

else

return (a*pow(a,(b-1)));

}

public static void main(String a[])

{

Recursion r= new Recursion();

Scanner sc= new Scanner(System.in);

double b,rs;

int pow;

System.out.print("Enter base :");

b= sc.nextDouble();

System.out.print("Enter power :");

pow= sc.nextInt();

rs= r.power(b,pow);

System.out.print("Result :"+rs);

}

}




Year : May 2009

Q2 ) a) GUI for Calculator

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

class Calculator extends JFrame implements ActionListener

{

JMenuBar mb = new JMenuBar();

JMenu file = new JMenu("File");

JMenuItem mexit = new JMenuItem("Exit");

JTextField t = new JTextField(20);

JButton bspace= new JButton("BackSpace");

JButton bce= new JButton("CE");

JButton bc= new JButton("C");

JLabel l1 = new JLabel("");












JButton b1 = new JButton("1");









JButton b0= new JButton("0");

JButton bslash = new JButton("/");

JButton bsqrt= new JButton("sqrt");

JButton b1byx= new JButton("1/x");

JButton bminus = new JButton("-");

JButton bplus= new JButton("+");

JButton bpercent = new JButton("%");

JButton bequal= new JButton("=");

JButton bmultiply = new JButton("*");

JButton bplusminus= new JButton("+/-");

JButton bpoint = new JButton(".");

JPanel p = new JPanel();

JPanel pbutton = new JPanel();

JPanel pbuttons = new JPanel(new GridLayout(4,5,5,5));

GridBagLayout gb = new GridBagLayout();

GridBagConstraints cs = new GridBagConstraints();

Calculator(String s)

{

super(s);

setBounds(400,400,400,230);

setResizable(false);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new BorderLayout());

pbutton.setLayout(gb);




cs.gridx=0;

cs.gridy=0;

cs.insets = new Insets(5,5,5,5);

gb.setConstraints(bspace,cs);

pbutton.add(bspace);

cs.gridx=1;

cs.gridy=0;


gb.setConstraints(l1,cs);

pbutton.add(l1);

cs.gridx=2;

cs.gridy=0;



pbutton.add(l2);

cs.gridx=3;

cs.gridy=0;



pbutton.add(l3);

cs.gridx=4;

cs.gridy=0;



pbutton.add(l4);

cs.gridx=5;

cs.gridy=0;



pbutton.add(l5);

cs.gridx=7;

cs.gridy=0;



pbutton.add(l6);

cs.gridx=8;

cs.gridy=0;






pbutton.add(l7);

cs.gridx=9;

cs.gridy=0;



pbutton.add(l8);

cs.gridx=10;

cs.gridy=0;



pbutton.add(l9);

cs.gridx=13;

cs.gridy=0;


gb.setConstraints(bce,cs);

pbutton.add(bce);

cs.gridx=12;

cs.gridy=0;


gb.setConstraints(bc,cs);

pbutton.add(bc);

pbuttons.add(b7);

pbuttons.add(b8);

pbuttons.add(b9);

pbuttons.add(bslash);

pbuttons.add(bsqrt);

pbuttons.add(b4);

pbuttons.add(b5);

pbuttons.add(b6);

pbuttons.add(bmultiply);

pbuttons.add(b1byx);

pbuttons.add(b1);

pbuttons.add(b2);

pbuttons.add(b3);

pbuttons.add(bminus);

pbuttons.add(bpercent);

pbuttons.add(b0);

pbuttons.add(bplusminus);




pbuttons.add(bpoint);

pbuttons.add(bplus);

pbuttons.add(bequal);

p.setLayout(new BorderLayout());

p.add(t,BorderLayout.NORTH);

p.add(pbutton,BorderLayout.SOUTH);

setJMenuBar(mb);

file.add(mexit);

mb.add(file);

c.add(p,BorderLayout.NORTH);

c.add(pbuttons,BorderLayout.CENTER);

t.setText("0");

//t.setHorizontalAlignment(JTextField.RIGHT);

t.setEditable(false);

setSize(400,400);

setVisible(true);

mexit.addActionListener(this);

pack();

}

public void actionPerformed(ActionEvent ae)

{

if(ae.getSource()==mexit)

{

System.exit(0);

}

}

public static void main(String args[])

{

Calculator cal = new Calculator("CALCULATOR");

}

}




Year : May 2009

Q3)b)Calculate Sum of Series :- 1+x+ x2+………….

Solution

import java.util.*;

public class Series

{

int x,n;

int pow(int a,int b)

{

if(b==0)

return 1;

else

return (a*pow(a,(b-1)));

}

void show()

{


System.out.print("\n Enter value of X:");

x=sc.nextInt();

System.out.print("\n Enter end limit n:");

n=sc.nextInt();

int d=0;

for(int i=0;i<=n;i++)

d=d+pow(x,i);

System.out.println("Sum of Series = "+d);

}


{

Series s= new Series();

s.show();

}

}




Year : May 2009

Q4)b) : Passing Parameter to Applet embedded in html

/*<applet code="DemoParam" width=400 height=400

<param name="Name" value="Hiray College">

<param name="Year" value="2001">

</applet> */

import java.applet.Applet;

import java.awt.*;

public class DemoParam extends Applet

{

String n;

int year;

public void init()

{

n = getParameter("Name");

year = Integer.parseInt(getParameter("Year"));

}

public void paint(Graphics g)

{

g.drawString("Name of College: "+n, 10, 20);

g.drawString("Year of Establishment: "+year, 10, 40);

}

}




Year : May 2009

Q6)b)

Program to explain multithreading with use of multiplication tables. Three threads must be

defined . Each one must create one multiplication table , they are 5 table, 7 table , 13 table

Sol:

class Table

{

int no;

Table(int t)

{

no = t;

}

}

public class Multitable extends Table implements Runnable

{

public Multitable(int c)

{

super(c);

}

public synchronized void run()

{

printTable();

}

public void printTable()

{

System.out.println("Table of : "+no+" ");

for(int i=1;i<=10;i++)

{

System.out.print(" "+(i*no));

}

System.out.println("_______________________");

}


{




Multitable mt = new Multitable(5);

Thread t1 = new Thread(mt);

t1.start();

Multitable mt1 = new Multitable(7);

Thread t2 = new Thread(mt1);

t2.start();

Multitable m = new Multitable(13);

Thread t3 = new Thread(m);

t3.start();

}

}




Dec 2009

Q2)a) Write a java program to copy contents of one file to another and display the contents

to console.

Solution:

import java.io.*;

public class Copyfile

{

public static void main(String argd[])

{

try

{

InputStream is= new FileInputStream("abc.docx");

OutputStream os= new

FileOutputStream("abc1.docx");

int c;

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

{

os.write((char)(c));

}

os.close();

is.close();

}

catch(Exception e)

{

}

}

}




Dec 2009

Q2)b) Refer May 09 Q6)b

Q3)b) Write a java Program to demonstrate any one type of Exception( Runtime

Unchecked Exceptions)

Solution:

import java.util.*;

public class MyException

{

String a[];

public MyException()

{

a=new String[2];

try

{


for(int i=0;i<5;i++)

{

System.out.print("Enter no "+(i+1)+" :");

a[i]=sc.next();

//b[i]=Integer.parseInt(a[i]);

}

}

catch(ArrayIndexOutOfBoundsException e )

{

System.out.println(e);

}

try

{

int x=5/0;

}

catch(ArithmeticException e1 )

{

System.out.println(e1);

}

try

{

int i=Integer.parseInt("1a");

}

catch(NumberFormatException e2 )




{


}

}


{

MyException e = new MyException();

}

}




Dec 2009

Q4 ) b ) What is interface . Explain with suitable java program

Refer Dec 2010 Q3)a.

Q6)b) What is Serialization ? Explain with suitable java Program

import java.io.*;

import java.util.*;

class MyObject implements Serializable

{

String s;

Date d;

public MyObject()

{

s = "Pantoji";

d = new Date();

}

public String toString()

{

return "String = "+s+"\t Date = "+d;

}

}

public class Serial

{


{

MyObject mo = new MyObject();

System.out.println("Before Serialization : "+mo.toString());

try

{

// Object Serialization : Writing onto the File

FileOutputStream fs = new

FileOutputStream("MyObject.dat");

ObjectOutputStream os = new

ObjectOutputStream(fs);

os.writeObject(mo);

os.close();




}

catch(IOException e)

{


}

try

{

// Object Serialization : Reading from the File

FileInputStream fis = new

FileInputStream("MyObject.dat");

ObjectInputStream ois = new

ObjectInputStream(fis);

mo = (MyObject) ois.readObject();

ois.close();

}

catch(IOException e)

{

e.printStackTrace();

}

catch(ClassNotFoundException cfe)

{

cfe.getMessage();

}

System.out.println("After deserialization: "+mo.toString());

}

}




Dec 2009

Q7)a) Write a java program to arrange Minal , Pooja , Shama , Geeta ,Neeta , Mohan in

ascending order

Solution

// I have done for command line arguments where any no of strings will be sorted

public class Sort

{


{

int i,j,l;

l=args.length;

String temp,arr[];

arr= new String[l];

for(i=0;i<l;i++)

arr[i]=args[i];

for(i=0;i<l;i++)

{

for(j=i+1;j<l;j++)

{

if(arr[i].compareTo(arr[j])>0)

{

temp=arr[i];

arr[i]=arr[j];

arr[j]=temp;

}

}

}

System.out.println("\n Arranged order is :");

for(i=0;i<l;i++)

System.out.print(arr[i]+"\t");

}

}




Dec 2009

Q7)b) Program to explain Wrapper Class

public class Wrap

{


{

Integer i =Integer.valueOf(43);

System.out.println("i = "+i);

Integer i1= new Integer(43);

byte b = i1.byteValue();

System.out.println("byte = "+b);

short s = i1.byteValue();

System.out.println("short = "+s);

double d = i1.doubleValue();

System.out.println("double = "+d);

float f = i1.floatValue();

System.out.println("float = "+f);

}

}




May 2010

Q1)b : Write a program showing three threads working simultaneously upon a single

object

Solution

class Counter

{

int count=15;

public int getCount()

{

return count;

}

}

public class GetCounter implements Runnable

{

Counter c = new Counter();


{

GetCounter gc = new GetCounter();

Thread t1 = new Thread(gc);



t1.setName("Thread-1 ");



t1.start();

t2.start();

t3.start();

}

public void decrement()

{

if(c.count>0)

{

c.count = c.count - 1;

System.out.println("Counter value for

:"+Thread.currentThread().getName()+" "+c.getCount());




try

{

Thread.sleep(1000);

}catch(InterruptedException e)

{

e.printStackTrace();

}

}

else

{

}

}

public synchronized void run()

{


{

decrement();

}

}

}




May 2010

Q3)b :Write a program to count no of objects created for class using static member method

Solution

public class ObjectCount

{

private static int count;

private int x;

public ObjectCount(int y)

{

x=y;

count++;

}

public static void showCount()

{

System.out.println("No of Objects Created = "+count);

}

public void show()

{

System.out.println("\n Value in the object is ="+x);

}


{

ObjectCount o1= new ObjectCount(10);

showCount();


showCount();


showCount();

o1.show();

o2.show();

o3.show();

}

}




May 2010

Q4)a)Create the following GUI using Swing

Solution:

import java.awt.*;


public class PrinterGui extends JFrame

{

JPanel p1,p2,p3,p4,p5;

JLabel l1;

JButton b_ok,b_cancel,b_setup,b_help;

JRadioButton Sel, All, App;

ButtonGroup bg1;

JComboBox Quality;

JCheckBox chk1,chk2,chk3,chk4;

public PrinterGui()

{

super("Printer");

l1=new JLabel("Printer:EPSon EPL-7000 ");

b_ok= new JButton("OK");

b_cancel=new JButton("Cancel");

b_setup= new JButton("Setup");

b_help= new JButton("Help");

Sel = new JRadioButton("Select ");

All = new JRadioButton("All ");

App = new JRadioButton("Applet");

bg1 = new ButtonGroup();

bg1.add(Sel);

bg1.add(All);

bg1.add(App);

Quality = new JComboBox();

Quality.addItem("High");

Quality.addItem("Medium");

Quality.addItem("Low");




chk1= new JCheckBox("Image");

chk2= new JCheckBox("Text");

chk3= new JCheckBox("Code");

chk4= new JCheckBox("Print to File");

p1= new JPanel ();

p2= new JPanel();

p3=new JPanel();

p4= new JPanel();

p5 = new JPanel();

p1.setLayout(new BorderLayout());

p2.add(l1);

p3.add(b_ok);

p3.setLayout(new BoxLayout(p3,BoxLayout.Y_AXIS));

p3.add(b_cancel);

p3.add(b_setup);

p3.add(b_help);

p4.add(Quality);

p4.add(chk4);

p5.setLayout(new GridLayout(3,2,5,5));

p5.add(chk1);

p5.add(chk2 );

p5.add(chk3 );

p5.add(Sel );

p5.add(All );

p5.add(App );

p1.add(p2,BorderLayout.NORTH);

p1.add(p3,BorderLayout.EAST);

p1.add(p4,BorderLayout.SOUTH);

p1.add(p5,BorderLayout.CENTER);

getContentPane().add(p1);

setVisible(true);

setSize(600,400);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

}


{

PrinterGui p1= new PrinterGui();

}

}




Dec 2010

Q2)a) Write a applet that takes 4 digit number as a parameter & prints the number in

reverse

import java.awt.*;

import java.applet.*;

/*<applet code="AppReverse.class" width=400 height=400>

<param name="No" value="1234">

</applet>*/

public class AppReverse extends Applet

{

int s,x;

public void init()

{

s=Integer.parseInt(getParameter("No"));

x=0;

int d,t;

t=s;

while(t>0)

{

d=t%10;

x=x*10+d;

t=t/10;

}

}

public void paint(Graphics g)

{

g.drawString("\n Reverse of "+s+" = "+x, 10, 20);

}

}




Dec 2010

Q2)b) Write a program to accept 5 no from user and demonstrate arithmetic ,

numberformat , arrayoutofbounds excpetion.

Solution:

Refer Dec 2009 Q3)b

Q3)b Write a program to create two threads using thread class , name the threads & let the

first thread print roll no and second print Percentage obtaimned

Solution

( Joint Effort by me and Tushar Fulmali )

class Student

{

int roll [];

float per [];

boolean b;

public Student()

{

roll=new int[]{1, 2, 3, 4, 5};

per=new float[]{40, 50, 60, 70, 80};

b=true;

}

public synchronized void printRoll()

{


{

if(!b)

{

try

{

// System.out.println ("Waiting.."+i+

" BOOL: "+b);

wait();

}

catch(Exception e )

{


}

}




System.out.println("Roll = "+roll[i]);

b=false;

notify();

}

}

public synchronized void printPer()

{


{

if(b)

{

try

{

// System.out.println ("Waiting.."+i+

" BOOL: "+b);

wait();

}

catch(Exception e )

{


}

}

System.out.println("Per = "+per[i]);

b=true;

notify();

}

}

}

class RollThread extends Thread

{

Student s;

public RollThread(Student s)

{

this.s=s;

this.start();

}

public void run()

{

s.printRoll();




}

}

class PerThread extends Thread

{

Student s;

public PerThread(Student s)

{

this.s=s;

this.start();

}

public void run()

{

s.printPer();

}

}

public class PrintThread

{


{

System.out.println("\n**Press Ctrl+C to Stop**\n");

Student s= new Student();

new RollThread(s);

new PerThread(s);

}

}




Dec 2010

Q4)a ) write a Program to create three threads to demonstrate how execution of them can

be controlled by setting priority of then to different level

Solution:

class testMulti implements Runnable

{

testMulti()

{

Thread cur = Thread.currentThread();

Thread t = new Thread (this, "New thread");

t.start();

try

{

for (int cnt = 10; cnt > 0; cnt --)

{

System.out.println ("Parent Thread : "+cnt);

Thread.sleep(1000);

}

}

catch (InterruptedException e)

{

System.out.println ("Interrupted");

}

System.out.println ("exiting main thread");

}

public void run ()

{

try

{

for (int i = 5; i > 0; i--)

{

System.out.println ("Child Thread : " + i);

Thread.sleep(2000);

}

}

catch (InterruptedException e)

{




System.out.println ("child interrupted");

}

System.out.println ("exiting child thread");

}

public static void main (String args[])

{

new testMulti();

}

}

class FooRun implements Runnable

{

public void run(String s)

{

String name;

name = s;

System.out.println("Name: "+name);

}

public void run()

{


{

System.out.println("Run By : --

"+Thread.currentThread().getName());

}

}

}

public class TestThread

{


{

FooRun fr = new FooRun();

Thread t = new Thread(fr);

Thread t1 = new Thread(fr);




Thread t2 = new Thread(fr);

t.setName("AAA");

t1.setName("BBB");

t2.setName("CCC");

t.start();

t.setPriority(9);

t1.start();

t1.setPriority(7);

t2.start();

t2.setPriority(9);

t2.yield();

fr.run("student");

}

}




Dec 2010

Q5)a)

Solution:

class A

{

public void ShowA()

{

System.out.println("In Show method of A class");

}

}

interface Ainter

{

void disp();

}

interface Binter extends Ainter

{

void show();

}

public class B extends A implements Binter

{

public void disp()

{

System.out.println("\n Display method overriding");

}

public void show()

{

System.out.println("\n Show method overriding");

}





{

B obj = new B();

obj.disp();

obj.show();

obj.ShowA();

}

}




Dec 2010

Q5)b) What is Swing ? Explain with suitable program any 5 swing components to create

sophisticated GUI

Solution

Refer May 2010 Q4)a)

Q6 ) b) WAP to create table CAR ( chasis no (primary key), model , mf_date, price ) &

insert 5 records then update price of each record two times & then delete the table

Solution ( New Included not in previous doc, for all programs of jdbc )

import java.sql.*;

public class CarTable

{

Connection conn;

PreparedStatement pstmt;

Statement stmt;

ResultSet rs;

String str;

public CarTable()

{

try

{

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

conn= DriverManager.getConnection("jdbc:odbc:MyDsn");

stmt= conn.createStatement();

}

catch(Exception e)

{


}

}

public void Create()

{

try

{

str= "Create TABLE Car (chasis integer, Model char(10),Mf_date datetime, Price

float)";

boolean b=stmt.execute(str);

System.out.println("Table Created Successfully ");

}




catch(Exception e)

{


}

}

public void Destroy()

{

try

{

str= "drop TABLE Car";

boolean b=stmt.execute(str);

System.out.println("Table Dropped Successfully ");

}

catch(Exception e)

{


}

}

public void disp()

{

try

{

str="Select * from car ";

ResultSet rs=stmt.executeQuery(str);

ResultSetMetaData rsmd = rs.getMetaData();

for(int i=1;i<=rsmd.getColumnCount();i++)

{

System.out.print(rsmd.getColumnName(i)+"\t");

}

System.out.println("\n-------------------------------------------------------");

while(rs.next())

{

for(int i=1;i<=rsmd.getColumnCount();i++)

{

System.out.print(rs.getString(i)+"\t");

}

System.out.println();

}

}




catch(Exception e )

{

System.out.println("In Select "+e);

}

}

public void update()

{

try

{

pstmt=conn.prepareStatement("Update car set Price = 2*Price");

int f=pstmt.executeUpdate();

if(f>0)

System.out.println(f+" Rows Updated");

}

catch(Exception e )

{

System.out.println("In Update "+e);

}

}

public void insert()

{

try

{

pstmt=conn.prepareStatement("insert into car values (?,?,?,?)");

for(int i=1;i<=5;i++)

{

pstmt.setInt(1,i);

pstmt.setString(2,"AA"+i);

pstmt.setString(3,"7-"+i+"-13");

pstmt.setFloat(4,(i*10000));


if(f>0)

System.out.println("Row Inserted");

}

}

catch(Exception e )

{

System.out.println("In insert "+e);




}

}

public void delete()

{

try

{

pstmt=conn.prepareStatement("delete from car");


if(f>0)

System.out.println(f+ " Rows Deleted");

}

catch(Exception e )

{

System.out.println("In insert "+e);

}

}

public static void main(String hehehe[])

{

try

{

CarTable obj =new CarTable();

System.out.println("Creating Table ");

obj.Create();

System.out.println("Inserting 5 values in Table ");

obj.insert();

System.out.println("Displaying values in Table ");

obj.disp();

System.out.println("Updating Price in table");

obj.update();

System.out.println(" Table after Updating Price");

obj.disp();

System.out.println(" Deleting values in table ");

obj.delete();

System.out.println(" Displaying after delete ");

obj.disp();

System.out.println(" Removing Table from Database ");

obj.Destroy();

}

catch(Exception e )




{

System.out.println("In main "+e);

}

}

}




May 2011

Q2)a) Write a program to Demonstrate Thread Intercommunication

Solution:

public class ThreadA

{


{

ThreadB b = new ThreadB();

b.start();

synchronized(b)

{

try

{

System.out.println("Waiting for b to complete...");

b.wait();

}

catch(InterruptedException e)

{

}

System.out.println("Total is : "+b.total);

}

}

}

class ThreadB extends Thread

{

int total;

public void run()

{

synchronized(this)

{


{

total += i;

}

notify();

}

}

}




May 2011

Q2)b) Wrapper Classes

Solution

Refer May 2009 Q7)b

Q4)a) (GUI Using 5 components )

Solution :

Refer May 2010 Q4)a

Q5)a) WAP in java to demonstrate any two java unchecked Runtime Exception Subclasses

Solution

Refer Dec 2009 Q3)b

Q5)b) WAP in java to show Serialization and Deserialization

Solution

Refer Dec 2009 Q6)b

Q6)a) Write a applet program to handle mouse events

/*

<applet code="MouseEvent1.class" width=400 height=400>

</applet>

*/

import java.applet.*;

import java.awt.*;


public class MouseEvent1 extends Applet implements MouseListener

{

public void init()

{

this.addMouseListener(this);

}

public void paint (Graphics g)

{

g.drawString("Right Click Red Color \n",50,50);

g.drawString("Left Click Yellow Color \n",50,70);

}

public void start()

{

System.out.println("Start Method ");




}

public void stop()

{

System.out.println("Stop Method ");

}

public void destroy()

{

System.out.println("Destroy Method ");

}

public void mouseExited(MouseEvent e)

{

System.out.println(" Mouse Exited");

super.setBackground(Color.CYAN);

}

public void mouseClicked(MouseEvent e)

{

System.out.println(" Mouse Clicked");

}

public void mouseEntered(MouseEvent e)

{

System.out.println(" Mouse Entered");

super.setBackground(Color.PINK);

}

public void mousePressed(MouseEvent e)

{

System.out.println(" Mouse Pressed");

if(e.getButton()==e.BUTTON1)

{

super.setBackground(Color.RED);

System.out.println("Color Changed ");

}

if(e.getButton()==e.BUTTON3)

{

System.out.println("Color abdh ");

super.setBackground(Color.YELLOW);

}

}

public void mouseReleased(MouseEvent e)

{




System.out.println(" Mouse Released");

}

}




May 2011

Q7)a) Write a java Code to demonstrate use of Final Keyword

class A

{

final void meth()

{

System.out.println("This is a final method.");

}

}

class B extends A

{

void meth() { // ERROR! Can't override.

System.out.println("Illegal!");

}

final class C

{

}

class D extends C // Error cannot extends

{

}

public class Final1

{

final int a=1;

public void mod()

{

a++; // Cannot modify Error

}

}




Dec 2011

Q6)b ) What is Exception ?Explain steps to create your own Exception with suitable

example

Solution:

Custom Exception Definition

public class OverDraftException extends Exception

{

String msg;

public OverDraftException()

{

msg="Hi Siddhiraj ! Your account does not have sufficient amount";

}

public OverDraftException(String str)

{

msg = str;

}

public String getMessage()

{

return msg;

}

}

Implementation of Exception

class BankAcc

{

int bal;

BankAcc(int b)

{

bal = b;

}

public void withdraw(int amt)

{

try

{

if((bal-amt)<500) throw new OverDraftException();

else

bal = bal - amt;

}

catch(OverDraftException od)

{




System.out.println(od.getMessage());

}

System.out.println("Balance: "+bal);

}

}

public class BankImpl

{


{

BankAcc a1 = new BankAcc(1000);

a1.withdraw(800);

}

}




May 2012

Q1)b ) Design a cricketer Class cricketer with name, age, batting average , bowling

average.Create an array of cricketer objects and sort it on batting average

Solution :-

import java.io.*;

public class Cricketer

{

String name;

int age;

float batavg,bolavg;

public void accept()

{

String temp="";

BufferedReader br = new BufferedReader(new

InputStreamReader(System.in));

System.out.print("\n Enter the Name of Cricketer :");

try

{

temp=br.readLine();

name = temp;

System.out.print("\n Enter the Age of "+name+"

:");

temp=br.readLine();

age=Integer.parseInt(temp);

System.out.print("\n Enter the Batting Average of

"+name+" :");

temp=br.readLine();

batavg=Float.parseFloat(temp);

System.out.print("\n Enter the Bowling Average of

"+name+" :");

temp=br.readLine();

bolavg=Float.parseFloat(temp);

}

catch(Exception e )

{


}

}

public void Disp()




{

System.out.println(name

+"\t"+age+"\t"+batavg+"\t"+bolavg);

}

public static void sortBatAvg ( Cricketer obj[],int n)

{

for(int i=0;i<n;i++)

{

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

{

if(obj[i].batavg>obj[j].batavg)

{

Cricketer t= obj[i];

obj[i]=obj[j];

obj[j]=t;

}

}

}

}

public static void main( String args[])

{

int n=0;

String t="";

System.out.print("\n Enter the no of Cricketers :");

BufferedReader br = new BufferedReader(new

InputStreamReader(System.in));

try

{

t= br.readLine();

}

catch( Exception e)

{


}

n=Integer.parseInt(t);

Cricketer obj[]= new Cricketer[n];


{

obj[i]= new Cricketer();




}


{

obj[i].accept();

}

System.out.println("Name \t Age \t Bat Avg \t Bol Avg");


{

obj[i].Disp();

}

sortBatAvg(obj,n);

System.out.println("After Sorting :");

System.out.println("Name \t Age \t Bat Avg \t Bol Avg");


{

obj[i].Disp();

}

}

}




May 2012

Q5)a) Design a swing application to select a file and display its contents in a text area. On

click of select button , program should display the file dialog , and on click of OK Button ,

the contents of selected file should be displayed in text Area

Solution


import java.io.*;

import java.awt.*;


public class FileDisp extends JFrame implements ActionListener

{

JPanel p1;

JTextArea t1;

JButton b1;

JLabel l1;

JFileChooser chooser ;

JScrollPane jsp;

public FileDisp()

{

super("This is the Testing of ");

p1 = new JPanel();

t1 = new JTextArea(20,30);

b1= new JButton ( "Select ");

b1.addActionListener(this);

l1= new JLabel ("Text of File ");

jsp= new JScrollPane(t1);

p1.add(l1);

p1.add(jsp);

p1.add(b1);

setVisible(true);

setSize(600,600);

setDefaultCloseOperation(EXIT_ON_CLOSE);

getContentPane().add(p1);

JFileChooser chooser = new JFileChooser();

}

public void actionPerformed(ActionEvent e)

{

String path="";




System.out.println("\n Action Evenrt mein aa gaya ");

if(b1.equals(e.getSource()))

{

String str1="";

JFileChooser chooser = new JFileChooser();

int returnVal = chooser.showOpenDialog(this);

if(returnVal == JFileChooser.APPROVE_OPTION)

{

System.out.println("You chose to open this file: " +

chooser.getSelectedFile().getPath());

try

{

FileInputStream fstream = new

FileInputStream(chooser.getSelectedFile().getPath());

DataInputStream dr= new DataInputStream(fstream);

System.out.println("\n File opened Successfully ");

BufferedReader br = new BufferedReader (new

InputStreamReader(dr));

str1=br.readLine();

while(str1!=null)

{

t1.append(str1);

System.out.println(str1);

t1.append("\n");

str1=br.readLine();

}

}

catch(Exception e2)

{


}

}

}

}


{

FileDisp obj = new FileDisp();

}

}




May 2012

Q6)a) What is Mouse Listener Interface? Write an applet to set the background color to

yellow on left click of mouse and to red on right click of mouse .

Solution

Refer May 2011) Q6)a

Best of

luck

Suggestions are welcomed.

Thanks to my friends and faculties.

THANK YOU , MISSION MCA TEAM

Java Paper Solutions With Questiosn Included

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