JAVA QP Programs Solutions

8/22/2019 JAVA QP Programs Solutions

1/45

Java Mumbai University Q. Paper (Programs) from May 2009 to May 2012 ( for MCA- Sem

IV)(Refer Questions from Q.papers)

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

Contact : [email protected] Page 1

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

Year : May 2009Q1) b )

import java.util.*;

public class Recursion

{

double exp(double a,int b)

{

if(b0)

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

else

return 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.exp(b,pow);

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

}

}


2/45





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("");





JLabel l6 = new JLabel("");JLabel l7 = new JLabel("");



JButton b1 = new JButton("1");





JButton b6 = new JButton("6");JButton b7 = new JButton("7");



JButton b0= new JButton("0");

JButton bslash = new JButton("/");


3/45





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

gb.setConstraints(l1,cs);

pbutton.add(l1);

cs.gridx=2;

cs.gridy=0;


4/45







pbutton.add(l2);

cs.gridx=3;

cs.gridy=0;cs.insets = new Insets(5,5,5,5);


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);


5/45





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");


6/45





//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");

}

}


7/45





Year : May 2009

Q3)b)

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


8/45





Year : May 2009

Q4)b) : Passing Parameter to 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);


9/45





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

}

}


10/45





Year : May 2009

Q6)b)

Table printing by thread

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


11/45





{

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();

}

}


12/45





Dec 2009

Q2)a) Copy Contents of One File to another

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)

{

}}

}


13/45





Dec 2009

Q2)b) Refer May 09 Q6)b

Q3)b) Runtime Unchecked Exceptions

import java.util.*;

public class MyException{

String a[];

public MyException()

{

a=new String[2];

try

{


for(int i=0;i


14/45





}

}


{

MyException e = new MyException();}

}


15/45





Dec 2009

Q6)b) Serialization

// Q6 ) b

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 = newFileOutputStream("MyObject.dat");

ObjectOutputStream os = new

ObjectOutputStream(fs);

os.writeObject(mo);

os.close();


16/45





}

catch(IOException e)

{

System.out.println(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());

}

}


17/45





Dec 2009

Q7)a) Sorting names

// Command line argument

public class Sort

{public static void main(String args[])

{

int i,j,l;

l=args.length;

String temp,arr[];

arr= new String[l];

for(i=0;i


18/45





Dec 2009

Q7)b) Wrapper Class

public class Wrap

{public static void main(String args[])

{

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);

}

}


19/45





May 2010

Q1)b : Multithreading

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 ");

t2.setName("Thread-2 ");t3.setName("Thread-3 ");

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

{


20/45





Thread.sleep(1000);

}catch(InterruptedException e)

{

e.printStackTrace();

}}

else

{

}

}

public synchronized void run()

{

for(int i=0;i


21/45





May 2010

Q3)b :Counting objects

//Asked for 10 marks ( just 30Lines = 1 Page )

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();ObjectCount o2= new ObjectCount(20);

showCount();

ObjectCount o3= new ObjectCount(30);

showCount();

o1.show();

o2.show();

o3.show();

}

}


22/45





May 2010

Q4)a)Creating a GUI ( five Swing Control and Layout Managers )

import java.awt.*;

import javax.swing.*;

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()

{

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();


23/45





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();

}

}


24/45





Dec 2010

Q2)a)

import java.awt.*;

import java.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);

}

}


25/45





Dec 2010

Q2)b) Refer Dec 2009 Q3)b

Q3)b Two Thread Printing ( 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()

{

for(int i=0;i


26/45





{

if(b)

{

try

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

" BOOL: "+b);

wait();

}

catch(Exception e )

{

System.out.println(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;


27/45





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);

}

}


28/45





Dec 2010

Q4)a ) Thread Priority

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");

}


29/45





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()

{

for(int i=0;i


30/45





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");

}

}


31/45





Dec 2010

Q5)a)

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();

}}


32/45





Dec 2010

Q5)b) Refer May 2010 Q4)a)

May 2011

Q2)a) Thread Intercommunication

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)

{

for(int i=0;i


33/45





notify();

}

}

}


34/45





May 2011

Q2)b) Refer May 2009 Q7)b

Q4)a) Refer May 2010 Q4)a

Q5)a) Refer Dec 2009 Q3)b

Q5)b) Refer Dec 2009 Q6)bQ6)a) Mouse Events in 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");


35/45





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");

}

}


36/45





May 2011

Q7)a) Final Keyword

// May 11 ) q7 ) a

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

}

}


37/45





May 2011

Q6)b) Custom Exception

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;

}

}

class BankAcc

{

int bal;

BankAcc(int b)

{

bal = b;

}

public void withdraw(int amt)

{

try

{

if((bal-amt)


38/45





}

}

public class BankImpl

{

public static void main(String args[]){

BankAcc a1 = new BankAcc(1000);

a1.withdraw(800);

}

}


39/45





May 2012

Q1)b ) Cricketer Class

// May 2012 Q1 . B ( 10 marks )

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 )

{System.out.println(e);

}

}

public void Disp()

{


40/45





System.out.println(name

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

}

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

{for(int i=0;i


41/45





for(int i=0;i


42/45





May 2012

Q5)a) Swing Application

// Program for Displaying the contents of a Selected File

// may 2012 )Q5 ) a ) ( 10 marks ), Solve Karun majja ali

import javax.swing.*;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 ");


43/45





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)

{

System.out.println(e2);

}

}}

}


{

FileDisp obj = new FileDisp();


44/45





}

}


45/45



May 2012

Q6)a) Mouse Listener Interface

Refer May 2011) Q6)a

Best of

luck

Suggestions are welcomed.

Documents

JAVA QP Programs Solutions