Page 265 - ComputerScience_Class_11

20 if (hours <= 1)

21 bill = 3;
22 else
23 bill = 3 + Math.ceil(hours - 1) * 1.5;
24 }
25 void display() {

26 System.out.println("Vehicle number: " + vno);
27 System.out.println("Hours: " + hours);
28 System.out.println("Bill: " + bill);
29 }
30 public static void main(String args[]) {

31 ParkingLot obj = new ParkingLot();
32 obj.input();
33 obj.calculate();
34 obj.display();

35 }
36 }

The output of the preceding program is as follows:
BlueJ: Terminal Window - Java

Options

Enter vehicle number: WB24A1234
Enter hours: 23
Vehicle number: WB24A1234
Hours: 23
Bill: 36.0

9.12.1 Features of the Constructor
The features of the constructor are as follows:
• The name of the class is the same as the name of the constructor.
• As soon as the object is declared, the constructor is automatically called.
• The constructor does not return a value, so it does not have a return type.

• The constructor is always public.
• The constructor is automatically overloaded.
• The constructor is used to initialise the data members.

9.12.2 Different Types of Constructors
There are four types of constructors. They are discussed as follows:
1. Default constructor: This constructor is created automatically and used to initialise all the data members with default
values, such as int variable will be initialised with 0, String variables will be initialised with “ ” (null) and so on.

Methods and Constructors 263