List of Experiments and Sample

CS8383 OBJECT ORIENTED PROGRAMMING LABORATORY

List of Experiments

1        1. Electricity Bill Generation – Classes and Objects

2. Employee salary calculation – inheritance

3. Shape program - Abstract class

4. Stack Implementation – Interface

5. Currency converter

6. Array list operations

7. User defined Exception handling

8. File Manipulation

9. Multithreaded program

10. Calculator using event driven programming

11. Generic function

12. Mini project

a.       Banking Application [Deposit, Withdraw, Balance Check, Amount Transfer, User profile] : using JDBC or Files

b.      Library Management [Book search, Loan information, Reserve Book, Issue book, Return book] : using JDBC or Files

c.       Employee Management [ Add/ Modify/ Delete / Search Employee information] : : using JDBC or Files

Observation and Record Format

Expt.no : 1                                           Electricity Bill Generation – Classes and Objects

Date:

Objective:

Develop a Java application to generate Electricity bill. Create a class with the following members: Consumer no., consumer name, previous month reading, current month reading, type of EB connection (i.e domestic or commercial). Compute the bill amount using the following tariff.

If the type of the EB connection is domestic, calculate the amount to be paid as follows:

 First 100 units - Rs. 1 per unit

 101-200 units - Rs. 2.50 per unit

 201 -500 units - Rs. 4 per unit

 > 501 units - Rs. 6 per unit

If the type of the EB connection is commercial, calculate the amount to be paid as follows:

 First 100 units - Rs. 2 per unit

 101-200 units - Rs. 4.50 per unit

 201 -500 units - Rs. 6 per unit

 > 501 units - Rs. 7 per unit

Procedure

1.      Design a base class ‘Connection’ with variables ‘consumerNumber’, ‘consumerName’, ‘previousMonthUnitsConsumed’, ‘currentMonthUnitsConsumed’ and ‘typeofEBConnection’ with the only method ‘calculateBill()’ which has no implementation.

2.      Design two types of ‘Connection’ classes namely ‘DomesticConnection’ and ‘CommercialConnection’ which inherit from the abstract base class (or interface) ‘Connection’.

3.      Implement the method ‘calculateBill()’ for domestic connection class as follows,

a.       First 100 units - Rs. 1 per unit,

b.      101-200 units - Rs. 2.50 per unit

c.       201 -500 units - Rs. 4 per unit

d.      501 units - Rs. 6 per unit.

4.      Implement the method ‘calculateBill()’ for commercial connection class as follows,

a.       First 100 units - Rs. 2 per unit,

b.      101-200 units - Rs. 4.50 per unit

c.       201 -500 units - Rs. 6 per unit

d.      501 units - Rs. 7 per unit.

5.      Design a client class with main method to calculate electricity bill based on the type of connection.

Program

Connection.java

public abstract class Connection{

            protected int consumerNumber;

            protected String consumerName;

            protected int previousMonthReading;

            protected int currentMonthReading;

            protected String typeofConnection;

            protected double billAmount;

            public void calculateBill();

}

DomesticConnection.java

public class DomesticConnection extends Connection {

public DomesticConnection(int cNumber,String cName,int pmReading,int cmReading,String tConnection) {

                        consumerNumber=cNumber;

consumerName=cName;

                        previousMonthReading=pmReading;

                        currentMonthReading=cmReading;

                        typeofConnection=tConnection;

                        billAmount=0.0;

            }

            public void calculateBill(){

                        if(currentMonthReading <= 100)

                                    billAmount = currentMonthReading * 1;

                        else if(currentMonthReading > 100 && currentMonthReading <= 200)

                                    billAmount = currentMonthReading * 2.5;

                        else if(currentMonthReading > 200 && currentMonthReading <= 500)

                                    billAmount = currentMonthReading * 4;

                        else if(currentMonthReading > 500)

                                    billAmount = currentMonthReading * 6;

            }

            public void displayBill() {

                        System.out.println(“Consumer number: ” + consumerNumber);

                        System.out.println(“Consumer name: ” + consumerName);

                        System.out.println(“Units consumed: ” + currentMonthReading);

                        System.out.println(“Bill amount: ” + billAmount);

            }

            }

CommercialConnection.java

public class CommercialConnection extends Connection {

public CommercialConnection(int cNumber,String cName,int pmReading,int cmReading,String tConnection) {

                                    …

                        }

                        public void calculateBill(){

                                    …

                        }

public void displayBill() {

                                    …

                        }

            }

Client.java

            import java.io.Scanner;

            public class Client {

                        public static void main(String args[]){

                                    Connection con = null;

                                    String conType=null;

                                    int menuOption = 0;

                                    Scanner in = null;

                                    while(true) {

                                                System.out.println(“\t\t Electricity Bill Application”);

System.out.println(“Enter the type of connection: domestic or commercial”);

conType = in.nextString();

                                                System.out.println(“1. Calculate bill”);

                                                System.out.println(“2. Display bill”);

                                                System.out.println(“3. Exit”);

                                                System.out.println(“Select from menu…”);

                                                in = new Scanner(System.in);                        

                                                menuOption = in.nextInt();

switch(menuOption) {

                        case 1:

                                                                        if(conType.equals(”commercial”))

                                                con = new DomesticConnection();

                                    else

                                                con = new CommercialConnection();

                                    con. calculateBill();

                                    break;

                        case 2:

                                    con.displayBill();

                                    break;

                        case 3:

                                    exit 1;

                        default:

                                    System.out.println(“Enter the correct option!”);

}

           

                                    }

                        }

            }

Output

                    

Result