Page 266 - ComputerScience_Class_11

2. Non-parameterised constructor: This constructor is used to initialise the instance variables with some initial values.
It does not take any parameters.
3. Parameterised constructor: This constructor is used to initialise the instance variables with the list of parameters
passed to it while creating an object.
For example,

Define a class ElectricityBill with the following specifications:
Program 12
Data Members Purpose
String n stores the name of the customer
int units stores the number of units consumed
double bill stores the amount to be paid
Member Methods Purpose
ElectricityBill (...) Parameterised constructor to store the name of the customer and
number of units consumed
void calculate() to calculate the bill as per the tariff table given below
void print() to print the details in the format given below
Tariff table
Number of units Rate per unit
First 100 units `2.00
Next 200 units `3.00
Above 300 units `5.00
A surcharge of 2.5% is charged if the number of units consumed is above 300 units.
Write a main method to create an object of the class and call the above member methods.

1 import java.util.*;
2 class ElectricBill
3 {

4 String n;
5 int units;
6 double bill;

7 ElectricBill(String name,int un)
8 {
9 n=name;

10 units=un;
11 }
12 void calculate()

13 {
14 if (units <= 100)
15 bill = units * 2;

16 else if (units <= 300)
17 bill = 200 + (units - 100) * 3;
18 else

264 Touchpad Computer Science (Ver. 3.0)-XI