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CS1031/OOPS Lab CSE/SRM 1/57

DEPARTMENT OF COMPUTER SCIENCE AND ENGINEERING

LAB MANUAL

Academic Year: 2015-16 ODD SEMESTER

Programme (UG/PG) : UG

Semester : III

Course Code : CS1031

Course Title : OBJECT ORIENTED PROGRAMMING LAB

Prepared By

Mrs.G.Vijayalakshmi (Assistant Professor (O.G), Department of Computer Science and Engineering)

FACULTY OF ENGINEERING AND TECHNOLOGY

SRM UNIVERSITY (Under section 3 of UGC Act, 1956)

SRM Nagar, Kattankulathur- 603203

Kancheepuram District


LIST OF EXPERIMENTS & SCHEDULE

Course Code: CS1031 Course Title: OOPS Lab

Exp. No. Title Week No.

C++

1.A. STATIC MEMBER VARIABLES 1

1.B. DEFAULT ARGUMENTS 1

2.A CONSTRUCTORS AND DESTRUCTORS 2

2.B. OPERATOR OVERLOADING 3

3.A. SINGLE INHERTANCE 4

3.B. HYBRID INHERITANCE 5

4.A. VIRTUAL FUNCTIONS 6

4.B. DYNAMIC POLYMORPHISM 6

5.A. EXCEPTION HANDLING IN STACKS 7

5.B. EXCEPTION HANDLING IN QUEUE 7

Course Coordinator HoD


LIST OF EXPERIMENTS & SCHEDULE

Course Code: CS1031 Course Title: OOP Lab

Exp. No. Title Week No.

JAVA

1.A. TYPE CASTING 1

1.B. METHOD OVERLOADING 1

2. MULTI LEVEL INHERITANCE 2

3. DYNAMIC MEMORY DISPATCH AND

METHOD OVERRIDING

3

4. CREATION OF PACKAGES 4

5. IMPLEMENTING INTERFACES 5

6. STRING MANIPULATION 6

7. MULTITHREADING IN JAVA 6

8. JAVA APPLET 7

Course Coordinator HoD


HARDWARE AND SOFTWARE REQUIREMENTS

Hardware Requirements:

RAM – 1 GB

Processor – Dual core

Software Requirements:

Operating System – Windows 7

Tool – JDK 1.6


Internal Assessment Mark Split Up

Observation : 20 Marks

Attendance : 5 Marks

Mini Project with the Report

(Max. 8 Pages & 3 Students per Batch) : 20 Marks

Model Exam : 15 Marks

TOTAL MARKS : 60 Marks


STATIC VARIABLE

Exp. No: 1.A

i. OBJECTIVE:

To write a C++ program to illustrate the static variable functionality using sum of a Fibonacci series

as an example.

ii. ALGORITHM:

STEP 1: Create a class with a static variable

STEP 2: This class will contain a method which will increase the value of this static variable.<and this

method is a recursive function>.

STEP 3: Use scope resolution operator and increase the scope of the variable.

STEP 4: Create an object of this class in main.

STEP 5: Call this method

iii. SOURCE CODE :

#include<iostream.h>

class item

{

public:

static int sum;

void fibo(int f,int s)

{

if(s>100)

cout<<"Sum="<<sum<<endl;

else

{

sum+=s;

fibo(s,f+s);

}

}

};

int item::sum;

int main()

{

item a;

a.sum=1;


a.fibo(1,1);

return 0;

}

iv. SAMPLE INPUTS & OUTPUTS:

RESULT :

The program was successfully compiled & executed, and the output was verified.


DEFAULT ARGUMENTS

Exp. No: 1.B

i. OBJECTIVE:

To write a C++ program to demonstrate default arguments with a simple example.

ii. ALGORITHM:

STEP 1: Include the Header file.

STEP 2: Create a function which takes in three arguments of which one is a preset default argument.

STEP 3: Now call this function and while calling this pass in 2 arguments rather than 3.

STEP 4: The default argument is already set.

STEP 5: The function will execute without showing any error.

iii. SOURCE CODE :


int main()

{

float amount;

float value(float p,int n,float r=0.15);

amount=value(500.00,5);

cout<<"\nFinal Value="<<amount<<"\n";

amount=value(1000.00,5,0.30);

cout<<"\nFinal Value="<<amount<<"\n";

return 0;

}

float value(float p,int n,float r)

{

int year=1;

float sum=p;

while(year<=n)

{

sum*=(1+r);

year+=1;

}

return sum;

}



Final value=1005.68

Final value=3712.93

RESULT :


v. Few (Min. 5) Questions related to the next Experiment:

1. What is a constructor?

2. What is Copyconstructor?

3. What is a Destructor?


4. What are the rules in defining Constructor?

5. What is overloading?

CONSTRUCTOR AND DESTRUCTOR (Dynamic memory allocation)

Exp. No: 2.A

i. OBJECTIVE:

To write a C++ program to demonstrate the use of constructors and destructors .

ii. ALGORITHM:

Step 1: Create a class

Step 2: Create a constructor for this class which will set the value of its member variables.

Step 3: Create the other required methods for the given class

Step 4: Define the destructor.

Step 5: Create an object of this class

Step 6: The constructor will be called upon creation and when the program is ending the destructor will be called.

iii. SOURCE CODE :


class Arr

{

int m,n;

int **a;

public:

Arr(int x,int y);

Arr(Arr &c){a=c.a;m=c.m;n=c.n;}

void getd();

void shd();

~Arr()

{delete a;}

};

Arr::Arr(int x,int y)

{

m=x;

n=y;

a=new int*[m];

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

a[i]=new int[n];

}


void Arr::getd()

{

int j;

cout<<"\nEnter the matrix elements:";

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

for(j=0;j<n;j++)

cin>>a[i][j];

}

void Arr::shd()

{

int j;

cout<<"\n\nMatrix elements:\n";

for(int i=0;i<m;i++){

for(j=0;j<n;j++)

cout<<a[i][j]<<" ";

cout<<endl;}

}

int main()

{

int m,n;

cout<<"Enter the size of matrix needed:";

cin>>m>>n;

Arr t(m,n),s(t);

cout<<"By help of constructor:";

t.getd();

t.shd();

cout<<"By help of copy constructor:";

s.shd();

s.getd();

s.shd();

return 0;

}


Enter the size of matrix needed: 2 2

By help of constructor:

Enter the matrix elements:

1 2


3 4

Matrix Elements

1 2

3 4

By help of copy constructor:

Matrix Elements

1 2

3 4

Enter the matrix elements:

1 2

3 4

Matrix Elements

2 2

3 4


v. RESULT :


OPERATOR OVERLOADING

Exp. No: 2.B

i. OBJECTIVE:

To write a C++ program to illustrate the operator overloading concept using Matrix addition as an

example.

ii. ALGORITHM:

Step 1: Create a class ’matrix’ with constructor that sets the value of its member variables.

Step 2: This class also overloads the + and = operator with proper operator overloaded functions.

Step 3: Define the operators.

Step 4: Create the object of this class and call these overloaded functions.

iii. SOURCE CODE :


class Matrix

{

public:

float row,col;

float **arr;

Matrix();

Matrix(float,float);

int inputDim(float,float);

int getMatrix();

Matrix operator+(Matrix);

Matrix operator=(Matrix&);

};

int Matrix::getMatrix()

{

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


for(int j=0;j<col;j++)

cin>>arr[i][j];

return 0;

}

Matrix::Matrix(float r,float c)

{

row=r;

col=c;

arr=new float*[row];


arr[i]=new float[col];

}

Matrix::Matrix()

{row=col=0;

arr=NULL;}

int Matrix::inputDim(float r,float c)

{

row=r;

col=c;

arr=new float*[row];


arr[i]=new float[col];

return 0;

}

Matrix Matrix::operator+(Matrix m)

{

Matrix t;

t.inputDim(m.row,m.col);

for(int i=0;i<m.row;i++)

for(int j=0;j<m.col;j++)

t.arr[i][j]=arr[i][j]+m.arr[i][j];

return t;

}

Matrix Matrix::operator=(Matrix &m)

{

for(int i=0;i<m.row;i++)

for(int j=0;j<m.col;j++)

arr[i][j]=m.arr[i][j];

return *this;

}


int main()

{

int r,c;

int getDimension(int &r,int &c);

int showResult(Matrix);

cout<<"\nEnter the matrix size of A\n";

getDimension(r,c);

Matrix a(r,c);

cout<<"\nEnter the matrix A\n";

a.getMatrix();

cout<<"\nEnter the matrix size of B\n";

getDimension(r,c);

Matrix b(r,c);

cout<<"\nEnter the matrix B\n";

b.getMatrix();

if(a.row==b.row && a.col==b.col)

{

Matrix x(r,c);

x=a+b;

cout<<"\nMatrix A:\n";

showResult(a);

cout<<"\nMatrix B:\n";

showResult(b);

cout<<"\nResultant Matrix:\n";

showResult(x);

}

else

cout<<"\nAddition not possible\n";

return 0;

}

int getDimension(int &r,int &c)

{

cout<<"\nEnter row and column:\n";

cin>>r>>c;

return 0;

}

int showResult(Matrix x)

{

for(int i=0;i<x.row;i++){

for(int j=0;j<x.col;j++)

cout<<x.arr[i][j]<<" ";


cout<<"\n";}

return 0;

}


Enter the matrix size of A:

Enter rows & columns 2 2

Enter the matrix A:

1 1 1 1

Enter the matrix size of B:

Enter rows & columns 2 2

Enter the matrix B:

1 1 1 1

Matrix A: 1 1 1 1

Matrix B: 1 1 1 1

Resultant Matrix:

2 2

2 2

RESULT :




1. Define inheritance?

2. What is access specifier?

3. Which is the default access specifier in C++?

4. Difference between multiple and multilevel inheritance?

5. Advantages of using inheritance?

SINGLE INHERITANCE USING BANKING SYSTEM

Exp. No: 3.A

i. OBJECTIVE:

To write a C++ program to illustrate the single inheritance using banking system as an example.

ii. ALGORITHM:


STEP 2: Create a forward declaration of a class.

STEP 3:Create a new class that has certain member functions and methods.

STEP 4:Create the class earlier defined in step 2 and Create it inherit from the class in step 2 using the

resolution : operator

STEP 5: Now create an object of the sun class and Create it call some methods you defined in sgtep 2.

iii. SOURCE CODE :


class sav_acct

class account

{

char cust_name[20];

int acc_no;

char acc_type[20];

public:

int get_accinfo()

{

cout<<"\n\nEnter customer name:-";

cin>>cust_name;

cout<<"\n\nEnter Account no:-";


cin>>acc_no;

cout<<"\n\nEnter Account type:-";

cin>>acc_type;

return 0;

}

int display_accinfo()

{

cout<<"\n\nCustomer Name:-"<<cust_name;

cout<<"\n\nAccount Number:-"<<acc_no;

cout<<"\n\nAccount Type:-"<<acc_type;

return 0;

}

};

class sav_acct:public account

{

static float savbal;

public:

int disp_savbal()

{

cout<<"\nBalance:-"<<savbal;

return 0;

}

int deposit_savbal()

{

float deposit,interest;

cout<<"\n Enter the amount to Deposit:-";

cin>>deposit;

savbal=savbal+deposit;

interest=(savbal*2)/100;

savbal=savbal+interest;

return 0;

}

void withdraw_savbal()

{

float withdraw;

cout<<"\nBalance:-"<<savbal;

cout<<"\nEnter amount to be withdrawn:-";

cin>>withdraw;

savbal-=withdraw;

if(withdraw>savbal)

{

cout<<"\n\nYou have to take permission for Bank overdraft Facility\n";


savbal+=withdraw;

}

else

cout<<"\nAfter withdrawl your Balance reveals:"<<savbal;

}

};

float sav_acct::savbal;

int main()

{

sav_acct s1;

int choice;

s1.get_accinfo();

while(1)

{

cout<<"\nchoose your choice\n";

cout<<"\n1)Deposit\n";

cout<<"\n2)Withdraw\n";

cout<<"\n3)Display Balance\n";

cout<<"\n4)Display with full details\n";

cout<<"\n5)Exit\n";

cout<<"Enter your choice:-";

cin>>choice;

switch(choice)

{

case 1:s1.deposit_savbal();

break;

case 2:s1.withdraw_savbal();

break;

case 3:s1.disp_savbal();

break;

case 4:s1.display_accinfo();

s1.disp_savbal();

break;

case 5:return(0);

default:cout<<"\n\nEntered choice is invalid";

}

}

return 0;

}



Enter customer name: Ajai

Enter account No: 123

Enter account type: Savings

Choose your choice

1) Deposit

2) withdraw

3) display Balance

4) Display with full details

5) Exit

Enter your Choice: 1

Enter the amount to Deposit 500


3

Balance:- 510



RESULT :


HYBRID INHERITANCE USING STUDENT DATABASE

Exp. No: 3.B

i. OBJECTIVE:

To write a C++ program to illustrate hybrid inheritance concept using student database creation as an

example.

ii. ALGORITHM:

Step 1:Create a class with some methods and variables.

Step 2:Create a new class that extends this class.

Step 3:Create a new class with some new methods.

Step 4:Create a new class again which inherits from classes defined in step 2 and step 3.

Step 5.Create an object of class defined in step 4 and Create it call methods defined in step 1 and step 3.

iii. SOURCE CODE :


class tests;

class sports;

class result;

class Student{

protected :int rn;

public:

void get()

{cout<<"\n\nEnter roll no.:";

cin>>rn;}

void put()

{cout<<"\nRoll no.:"<<rn<<endl;


}

};

class tests:public Student

{

protected:

float sub1,sub2;

public:

void get_m()

{cout<<"\nenter marks:";

cin>>sub1>>sub2;}

void put_m()

{

cout<<"\nMarks in subject 1="<<sub1<<endl;

cout<<"\nMarks in subject 2="<<sub2<<endl;

}

};

class sports

{

protected:

char g;

public:

void get_g()

{

cout<<"Enter the grade:";

cin>>g;

}

void put_g()

{

cout<<"\nGrade in sports:"<<g<<endl;

}

};

class result:private tests,private sports

{

public:

void res()

{

get();

get_m();

get_g();

cout<<"\n------\nRESULT\n------\n";

put();

put_m();


put_g();

float total=sub1+sub2;

cout<<"TOTAL="<<total;

}

};

void main()

{

result s1;

s1.res();

}


Enter roll no.:100

Enter Marks: 89 90

Enter the Grade: A

Result

roll no.:100

Marks in subject 1=89

Marks in subject 2=90

Grade in sports: A

Total= 179


RESULT :



1. Define polymorphism?

2. What is virtual function?

3. Difference between function overloading & virtual function?

4. What is use of base class pointer?

5. How to achieve run time polymorphism?

VIRTUAL FUNCTION

Exp. No: 4.A

i. OBJECTIVE:

To write a C++ program to illustrate virtual function implementation.

ii. ALGORITHM:

Step 1:Create a class base with a method marked as virtual.

Step 2:Create a subclass of base called derived and redefine the method defined in step 1.

Step 3:Create an object pointer of type base and Create it point to an object of type base first and call the

methods you had marked as virtual using -> operator.

Step 4: repeat the same steps but by making the pointer point to an object of derived type now.

iii. SOURCE CODE :


class base

{

public:

void display()

{cout<<"\nDisplay base";}

virtual void show(){cout<<"\nShow base.";}

};

class derived:public base

{

public:


void display(){cout<<"\nDisplay derived";}

void show(){cout<<"\nShow Derived.";}

};

int main()

{

base b;

derived d;

base *bptr;

bptr=&b;

cout<<"\nbptr points to base\n";

bptr->display();

bptr->show();

cout<<"\n\nbptr points to derived.";

bptr=&d;

bptr->display();

bptr->show();

return 0;

}


bptr points to base

Show base

Display base

bptr points to derived

Show derived

Display derived


RESULT :


DYNAMIC POLYMORPHISM

Exp. No: 4.B

i. OBJECTIVE:

To write a C++ program to illustrate dynamic polymorphism using different shapes as an example.

ii. ALGORITHM:

Step 1:Make a class area which has a method.

Step 2:Make subclasses to this which have constructors that will take in the value for the required

fields and will compute the area and put it in one of the member variables.

Step 3:call the method defined in step 1, which is overridden in all the subclasses to show their

respective areas .

iii. SOURCE CODE :


class Circle;

class Rectangle;

class Square;

class Triangle;

class Trapezium;

class Area

{


protected:

float area;

public:

Area(float a)

{

area=a;

}

virtual void display(){}

};

class Circle:public Area

{

protected:

float ar;

public:

Circle(float a):Area( a)

{ar=3.14*a*a;}

void display()

{

cout<<"Area of Circle="<<ar;

}

};

class Rectangle:public Area

{

protected:

float ar;

public:

Rectangle(float a,float b):Area( a)

{ar=a*b;}

void display()

{

cout<<"Area of Rectangle="<<ar;

}

};

class Square:public Area

{

protected:

float ar;

public:

Square(float a):Area( a)

{ar=a*a;}

void display()

{


cout<<"Area of Square="<<ar;

}

};

class Triangle:public Area

{

protected:

float ar;

public:

Triangle(float a,float b):Area( a)

{ar=0.5*a*b;}

void display()

{

cout<<"Area of Triangle="<<ar;

}

};

class Trapezium:public Area

{

protected:

float ar;

public:

Trapezium(float a,float b):Area( a)

{ar=0.5*(a+b);}

void display()

{

cout<<"Area of Trapezium="<<ar;

}

};

int main()

{

cout<<"\nEnter radius of circle:";

int ra;

cin>>ra;

Circle c(ra);

cout<<"\nEnter length and breadth of rectangle:";

int a,b;

cin>>a>>b;

Rectangle r(a,b);

cout<<"Enter side of square:";

int sq;

cin>>sq;


Square s(sq);

cout<<"Enter height and base of circle:";

int h,ba;

cin>>h>>ba;

Triangle t(h,ba);

cout<<"Enter parallel sides's length of trapezium:";

int p,pt;

cin>>p>>pt;

Trapezium tr(p,pt);

Area *bptr[5];

bptr[0]=&c;

bptr[1]=&r;

bptr[2]=&s;

bptr[3]=&t;

bptr[4]=&tr;

bptr[0]->display();

bptr[1]->display();

bptr[2]->display();

bptr[3]->display();

bptr[4]->display();

return 0;

}


Enter radius of circle: 2

Enter length and breadth of rectangle: 4 6

Enter side of square: 2

Enter height and base of circle: 3 2

Enter parallel sides's length of trapezium: 3 3

Area of circle=12.56

Area of rectangle=24

Area of square=4

Area of triangle=3

Area of Trapezium=1.5


RESULT :



1. What is exception handling?

2. Blocks of exception handling?

3. What is throw statement?

4. Strategy of Stack & Queue operation?

5. Catching all exceptions?

EXCEPTION HANDLING IN STACKS

Exp. No: 5.A

i. OBJECTIVE:

To write a C++ program to illustrate exception handling concept using stack operation as an example.

ii. ALGORITHM:


STEP 2: Create a class Stack which initialize size of the stack

STEP 3: Create function push to do insert operation which in turn throws an exception when it overflow.

STEP 4: Create function pop to do delete operation which in turn throws an exception when it

underflow.

STEP 5: Display the operation on console using display function.

iii. SOURCE CODE :


class Stack

{

public:

int size;


int top;

int *a;

Stack(int sz)

{

size=sz;

a=new int[sz];

top =-1;

}

void push(int c)

{

if(top==size-1){

throw top;

}

else

{

a[++top]=c;

}

}

void pop()

{

if(top==-1)

throw top;

else

cout<<"\n"<<a[top--]<<" removed\n";

}

void display();

};

void Stack::display()

{

cout<<"\nStack:\n";

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

cout<<a[i]<<" ";

}

int main()

{

int sz,x,ch;

cout<<"\nEnter stack size:";

cin>>sz;

Stack s(sz);

try

{


do

{

cout<<"\nEnter choice:\n1 for push\n2 for pop\n3 for display\n4 to exit\n";

cin>>ch;

switch(ch)

{

case 1:cout<<"\nEnter a no.:";

cin >>x;

s.push(x);

break;

case 2:s.pop();

break;

case 3:s.display();

break;

case 4:return 0;

break;

default:

cout<<"Enter a valid choice.";

}

}while(1);

}

catch(int a)

{

if(a==s.size-1)

cout<<"\nOverflow\n";

else

cout<<"\nUnderflow";

}

return 0;

}


Enter the size of stack: 3

Enter choice:

1 for push

2 for pop

3 for display

4 to exit

1

Enter a no 2

1


Enter a no 3

3

3

2

2

Removed

3

2

RESULT :


EXCEPTION HANDLING IN QUEUES

Exp. No: 5.B

i. OBJECTIVE:

To write a C++ program to illustrate exception handling concept using queue operation as an

example.

ii. ALGORITHM:


STEP 2: Create a class Stack which initialize size of the stack

STEP 3: Create function push to do insert operation which in turn throws an exception when it overflow.

STEP 4: Create function pop to do delete operation which in turn throws an exception when it

undererflow.

STEP 5: Display the operation on console using display function.

iii. SOURCE CODE :


class queue

{


public:

int size;

int front ,rear;

int *a;

queue(int sz)

{

size=sz;

a=new int[sz];

front =-1;

rear=-1;

}

void insert(int c)

{

if(rear==size-1){

throw rear;

}

else

{

a[++rear]=c;

}

}

void remove()

{

if(front==rear)

throw 'u';

else

cout<<"\n"<<a[++front]<<" removed\n";

}

void display();

};

void queue::display()

{

cbout<<"\nQueue:\n";

for(int i=front + 1 ;i<=rear;i++)

cobut<<a[i]<<" ";

}

int main()

{

int sz,x,ch;

cout<<"\nEnter queue size:";

cin>>sz;

queue s(sz);


try

{

do

{

cout<<"\nEnter choice:\n1 for insert\n2 for remove\n3 for display\n4 to exit\n";

cin>>ch;

switch(ch)

{

case 1:cout<<"\nEnter a no.:";

cin >>x;

s.insert(x);

break;

case 2:s.remove();

break;

case 3:s.display();

break;

case 4:return 0;

break;

default:

cout<<"Enter a valid choice.";

}

}while(1);

}

catch(int a)

{

if(a==s.size-1)

cout<<"\nOverflow\n";

}

catch(char c)

{

if(c=='u')

cout<<"\nUnderflow.";

}

return 0;

}


Enter the size of queue: 3

Enter choice:

1 for insert


2 for delete

3 for display

4 to exit

1

Enter a no 2

1

Enter a no 3

3

2

3

2

Removed

2

2

RESULT :



JAVA

TYPE CASTING

Exp. No: 1.A

i. OBJECTIVE:

To write a program to demonstrate typecasting in java.

ii. ALGORITHM:

Step 1: create a class containing main function

Step 2: declare an integer, byte, double variable.

Step 3: convert integer to byte using (byte).

Step 4: convert double to integer using (int).

Step 5: convert double to byte using (byte).

iii. SOURCE CODE :

class Coversion


{

public static void main(String args[])

{

byte b;

int i=255;

double d=323.142;

System.out.println("\nConversion of int into byte:-");

b=(byte)i;

System.out.println("i and b:"+i+" and "+b);

System.out.println("\nConversion of double to int:-");

i=(int)d;

System.out.println("d and i:"+d+" and "+i);

System.out.println("\nConversion of double to byte:-");

b=(byte)d;

System.out.println("d and b:"+d+" and "+b);

}

}


Conversion of int into byte:-

i and b:255 and -1

Conversion of double to int:-

d and i:323.142 and 323

Conversion of double to byte:-

d and b:323.142 and 67

RESULT :


METHOD OVERLOADING

Exp. No: 1.B

i. OBJECTIVE:

To write a program to demonstrate method overloading in java.

ii. ALGORITHM:

Step1:Create a class with main function

Step2:Create one more class with an overloaded function called test.There is a difference in the type of

return values and the signature arguments.

Step 3:Create an object ofthis class in side the main function and call the overloadedmethodwith different

arguments.


iii. SOURCE CODE :

class Overload{


{

OvDe o=new OvDe();

double s;

o.test();

o.test(10);

o.test(32,64);

s=o.test(5.5);

System.out.println("Result of o.test(5.5): "+s);

}

}

class OvDe

{

void test()

{

System.out.println("No parameters");

}

void test(int a)

{

System.out.println("a: "+a);

}

void test(int a,int b)

{

System.out.println("a and b: "+a+" "+b);

}

double test(double a)

{

System.out.println("double a: "+a);

return a*a; }}


No parameters

a: 10

a and b: 32 64

double a: 5.5

Result of o.test(5.5): 30.25


RESULT :



1. Define inheritance?

2. What is access specifier?

3. Which is the default access specifier in C++?

4. Difference between multiple and multilevel inheritance?

5. Advantages of using inheritance?

MULTILEVEL INHERITANCE

Exp. No: 2

i. OBJECTIVE:

To write a java program to illustrate the multilevel inheritance using database creation as an example.

ii. ALGORITHM:

S t e p 1 : Create a class with main function.


Step 2 : Create a class ‘Staff' with member variables and setter and getter methods

S t e p 3 : Create a class ‘typist ' which extends the class ‘staff' again with some setter methods .

Step 4: create a class ‘casual’ which extends the class ‘typist’ again with some setter methods.

Step 5: create an object of class ‘casual’ and call methods that were originally defined in the department

class ( and not overridden)

S t e p 6 : Call the getter methods to retrieve the details .

iii. SOURCE CODE :

class Imps

{


{

casual s= new casual();

s.getD("Ankit","Typist");

s.getS('m');

s.prF();

}

}

class Staff

{

String na;

String c;

void getD(String n,String co)

{

na=n;

c=co;

}

void prD()

{

System.out.println("Staff Detail:\nName:"+na+"\nCode:"+c);

}

}

class typist extends Staff

{

char speedCode;

void getS(char s)

{

speedCode=s;

}

void disS()

{


prD();

System.out.println("Speed Code:"+speedCode);

}

}

class casual extends typist

{

void prF()

{

int daw=0;

switch(speedCode)

{

case 's':daw=100;

break;

case 'm':daw=300;

break;

case 'f':daw=500;

break;

default:

System.out.println("Invalid Code entered .");

}

disS();

System.out.println("Daily Wages:Rs"+daw);

}

}


Staff Details:

Name:XYZ

Code:Typist

SpeedCode:m

Daily Wages:Rs 300


RESULT :



1. Difference between overloading & overriding?

2. How to invoke superclass constructor?

3. Use of super keyword?

4. Implementing overriding?

5. Use of throws keyword?

DYNAMIC MEMORY DISPATCH AND METHOD OVERRIDING

Exp. No: 3

i. OBJECTIVE:

To write a java program to illustrate the dynamic memory dispatch and method overriding concept

with a simple example.

ii. ALGORITHM:


Step 1:Create a class with the main function

Step 2:Create a class ‘Figure' which is extended to other classes:Rectangle,Circle and triangle.

Step 3:in class figure there is a method called area and thismethod is given a new definition in the subclasses.

So it is overridden

Step 4:Now construct the objects ofthe subclasses with the required attributes , that are set in the constructor.

Step 5:Call the area function of all the three objects of different classes(having the same parent class).

iii. SOURCE CODE :

import java.io.*;

class DyMemDisp

{

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

{

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

Figure f;

System.out.println("Enter the length of rectangle:");

float l=Float.parseFloat(b.readLine());

System.out.println("Enter the breadth of rectangle:");

float g=Float.parseFloat(b.readLine());

Rectangle r=new Rectangle(l,g);

System.out.println("Enter the radius of circle:");

float ra=Float.parseFloat(b.readLine());

Circle c=new Circle(ra);

System.out.println("Enter the base of triangle:");

float br=Float.parseFloat(b.readLine());

System.out.println("Enter the height of triangle:");

float he=Float.parseFloat(b.readLine());

Triangle t=new Triangle(br,he);

f=r;

f.area();

f=c;

f.area();

f=t;

f.area();

}

}

class Figure

{

float d1,d2;

Figure(float a,float b)

{

d1=a;

d2=b;


}

void area()

{}

}

class Rectangle extends Figure

{

float l,ba;

Rectangle(float a,float b)

{

super(a,b);

l=a;

ba=b;

}

void area()

{

System.out.println("Area of rectangle="+(l*ba));

}

}

class Circle extends Figure

{

float r;

Circle(float a)

{

super(a,0);

r=a;

}

void area()

{

System.out.println("Area of circle="+(3.14f*r*r));

}

}

class Triangle extends Figure

{

float ba,h;

Triangle(float a,float b)

{

super(a,b);


ba=a;

h=b;

}

void area()

{

System.out.println("Area of Triangle="+(0.5f*ba*h));

}

}


Enter the length of rectangle:

5

Enter the breadth of rectangle:

2

Enter the radius of circle:

2

Enter the base of triangle:

2

Enter the height of triangle:

8

Area of rectangle=10.0

Area of circle=12.56

Area of Triangle=8.0

v. RESULT :


vi. Few (Min. 5) Questions related to the next Experiment:

1. What are packages?

2. How to create a package?

3. How to run a package program?

4. Define protected access specifier?

5. How to import a user defined package?

CREATION OF PACKAGES

Exp. No: 4

i. OBJECTIVE:

To write a java program to demonstrate the package concept using a simple example.

ii. ALGORITHM:


STEP 1: Create a package of user defined.

STEP 2: Create a classes of specific user defined and save them in the package folder created.

STEP 3: All the classes are saved in a separate file and used in a package folder just by importing them.

STEP 4: The members and methods and class defined as protected specifier can be accessed throughout

the package.

iii. SOURCE CODE :

File name: Check.java

package rear;

public class Check

{

int n=1;

private int np=2;

protected int npro=3;

public int npub=4;

public Check()

{

System.out.println("Base constructor:");

System.out.println("default n:"+n);

System.out.println("private n(np):"+np);

System.out.println("protected n(npro):"+npro);

System.out.println("public n(npub):"+npub);

System.out.println(" ");

}

}

File name: DerSame.java

package rear;

class DerSame extends Check

{

DerSame()

{

System.out.println("Derived Constructor");

System.out.println("n:"+n);

System.out.println("npro:"+npro);

System.out.println("npub:"+npub);


}

}

File name: Create.java

package rear;

class Create


{


{

DerSame d=new DerSame()

}

}

File name: DerAno.java

package Front;

import rear.Check;

class DerAno

{


{

System.out.println("Importing class Constructor");

Check c=new Check();

System.out.println("npub:"+c.npub);


}

}


Running Create.class

Base constructor:

default n:1

private n(np):2

protected n(npro):3

public n(npub):4

Derived Constructor

n:1

npro:3

npub:4

Running DerAno.class

Importing class Constructor

Base constructor:

default n:1

private n(np):2


protected n(npro):3

public n(npub):4

npub:4

RESULT :



1. Define interface?

2. What is abstract class?

3. Use of implements keyword?

4. Difference between extends and implements?

5. Use of interface?

IMPLEMENTING INTERFACES

Exp. No: 5

i. OBJECTIVE:

To write a java program to illustrate the interfaces concept.

ii. ALGORITHM:


Step 1: Create a class with main function

Step 2:Create an interface ‘Show' with an abstract method. Create an interface ‘Greater' which extends

this interface.

Step 3:Create a class'Doo' which implents this interface and it also defines all the abstractmethods of this

interface .

Step 4:Create an object ofthis class and call these redefined methods.

iii. SOURCE CODE :

import java.io.*;

class Cv

{


{

Doo d=new Doo();


System.out.println("Enter value of x:");

d.x=Integer.parseInt(b.readLine());

System.out.println("Enter value of y:");

d.y=Integer.parseInt(b.readLine());

System.out.println("Output:");

d.print();

d.check();

}

}

class Doo implements Greater

{

int x;

int y;

public void print()

{

System.out.println("x:"+x+"\ny:"+y);

}

public void check()

{

System.out.println("Greater out of x and y:"+((x>y)?x:y));

}

}

interface Show

{

void print();

}

interface Greater extends Show

{


void check();

}


Enter value of x:

21

Enter value of y:

2

Output:

x:21

y:2

Greater out of x and y :21

RESULT :



1. Explain about string class?

2. What is string tokenizer?

3. List any 5 string methods?

STRING MANIPULATION

Exp. No: 6

i. OBJECTIVE:

To manipulate strings in java.


ii. ALGORITHM:

Step 1:create a class with the main function.

Step2:Get a string input from the user using the BufferedrEADER STREAM.

Step 3:call the following functions on the string: .toLowerCase(),.toUpperCase()

Step 4:Place an integer in the wrapper class Integer and parse it to strings using toString()

Step 5:Try calling 4 more methods on the strings.

iii. SOURCE CODE :

import java.io.*;

class StrMan

{


{


System.out.println("Enter a String:");

String s=b.readLine();

System.out.println("Trimmed String:"+s.trim());

System.out.println("Entered string in lowwer case: "+s.toLowerCase());

System.out.println("Entered string in upper case: "+s.toUpperCase());

Integer a=new Integer(8);

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

System.out.print("a.toString():");

System.out.println(a.toString());

System.out.println("Enter the position to extract character:");

int p=Integer.parseInt(b.readLine());

if(p<=s.length())

System.out.println("Charachter at pos "+p+" in String "+s+" is '"+s.charAt(p-1)+"'.");

else

System.out.println("Valid position not entered.");

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

System.out.println("Index of '"+s.charAt(i)+"' is "+s.indexOf(s.charAt(i)));

System.out.println("Enter the index to replace charachter:");

p=Integer.parseInt(b.readLine());

if(p<s.length())

{

System.out.println("Enter the charachter to replace with:");

char c=(char)b.read();

System.out.println("Replaced String:"+s.replace(s.charAt(p),c));

}

else

System.out.println("Enter a valid position.");

}


}


Enter a String:

Ankit

Trimmed String:Ankit

Entered string in lowwer case: ankit

Entered string in upper case: ANKIT

a= 8

a.toString():8

Enter the position to extract character:

2

Charachter at pos 2 in String Ankit is 'A'.

Index of is 0

Index of 'A' is 1

Index of 'n' is 2

Index of 'k' is 3

Index of 'i' is 4

Index of 't' is 5

Enter the index to replace charachter:

0

Enter the charachter to replace with:

S

Replaced String:SAnkit

v. RESULT :


vi. Few (Min. 5) Questions related to the next Experiment:

1. Define thread?

2. Which interface is driven by thread?

3. What is the base class for thread?

4. List some of the static methods of thread?

5. Difference between sleep & wait?

MULTITHREADING

Exp. No: 7

i. OBJECTIVE:

To write a java program to multithreading concept .

ii. ALGORITHM:


Step 1:Create a class which either extends Thread or implements Runnable.

Step 2:This class itself makes its own object to the thread and calls the start methodwhich will call the run

method.

Step 3:Define the run method.

Step 4:Create an object ofthis class in main and the thread willstart automatically as the start is called in its

constructor.

Step 5:So we have 2 threads: onewhich you have made and the other is the main thread running

simultaneously.

iii. SOURCE CODE :

class ThreadDemo {


{ new NewThread();

try {

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

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

Thread.sleep(1000); } } catch (InterruptedException e)

{System.out.println("Main thread interrupted.");

} System.out.println("Main thread exiting.");

}

}

class NewThread implements Runnable { Thread t;

NewThread() {

t = new Thread(this, "Demo Thread");

System.out.println("Child thread: " + t);

t.start();

}

public void run() {

try {

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

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

Thread.sleep(500); } }

catch (InterruptedException e)

{ System.out.println("Child interrupted."); }

System.out.println("Exiting child thread."); }

}


Child thread: Thread[Demo Thread,5,main]

Main Thread: 5

Child Thread: 5

Child Thread: 4

Main Thread: 4

Child Thread: 3


Child Thread: 2

Child Thread: 1

Main Thread: 3

Exiting child thread.

Main Thread: 2

Main Thread: 1

Main thread exiting.

RESULT :



1. Define applet?

2. Give the interface used ti implement applet?

3. What is the base class of applet?

4. List the static methods of awt?

5. What is the use of applet viewer?

JAVA APPLET

Exp. No: 8

i. OBJECTIVE:

To write a java program to implement java applet concept .


ii. ALGORITHM:

Step1: Create a html file which holds the width and height of the form.

Step2: Create a class which implements the runnable interface of thread.

Step3: use the methods of applet class and set the color of background and foreground.

Step4: use the thread methods to invoke the functions.

Step5: Run the code through appletviewer online.

iii. SOURCE CODE :

/* A simple banner applet.

This applet creates a thread that scrolls the message contained in msg right to left across the

applet's window.

*/ import java.awt.*; import java.applet.*; /* <applet code="SimpleBanner" width=300

height=50> </applet> */

public class SimpleBanner extends Applet implements Runnable { String msg = " A Simple Moving

Banner."; Thread t = null; int state; boolean stopFlag;

// Set colors and initialize thread.

public void init() { setBackground(Color.cyan); setForeground(Color.red); }

// Start thread

public void start() { t = new Thread(this); stopFlag = false; t.start();}

// Entry point for the thread that runs the banner.

public void run() { char ch;

// Display banner

for( ; ; ) { try { repaint(); Thread.sleep(250); ch = msg.charAt(0); msg = msg.substring(1,

msg.length()); msg += ch; if(stopFlag) break; } catch(InterruptedException e) {} }

}

// Pause the banner.

public void stop() { stopFlag = true; t = null; }

// Display the banner.

public void paint(Graphics g) { g.drawString(msg, 50, 30); }

}



RESULT :


department of computer science and engineering lab manual ... · pdf filecs1031/oops lab...

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