Define A Constructor As Indicated. Sample Output For Below Program:
Question
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Answer ( 1 )
Define A Constructor As Indicated. Sample Output For Below Program
Are you new to programming and struggling to understand constructors? Don’t worry, we’ve got you covered! In this blog post, we will define a constructor in simple terms so that even beginners can grasp its concept easily. We also provide a sample output for the below program to help illustrate how constructors work. So, whether you’re a novice or an experienced programmer looking for a quick refresher on constructors, read on and learn everything you need to know!
What is a constructor?
A constructor is a member function of a class that is used to initialize objects of that class. A constructor is called when an object of that class is created. Constructors have the same name as the class they are in, and they usually have no return type.
There are two types of constructors: the default constructor and the parameterized constructor. The default constructor is called when an object is created without any arguments. The parameterized constructor is called when an object is created with arguments.
In the below program, we have defined a class named ‘Rectangle’ with two data members ‘length’ and ‘width’. The default constructor initializes these data members with the value 0 and the parameterized constructor initializes them with values passed as arguments.
The different types of constructors
There are three types of constructors in java:
1) Default constructor: A default constructor is a constructor that takes no parameters. A default constructor is automatically generated by the compiler if a class does not explicitly define any constructors.
2) Parameterized constructor: A parameterized constructor is a constructor that takes one or more parameters. A parameterized constructor must be defined by the programmer.
3) Copy constructor: A copy constructor is a constructor that takes an object of the same class as an argument. A copy constructor is used to create a new object that is a copy of an existing object.
Why use a constructor?
There are several reasons to use a constructor when defining a class. First, a constructor can be used to initialize member variables of the class. This is especially important when the member variables represent some form of state for the object, such as properties that will be persisted to storage. Secondly, constructors can be used to enforce invariants on an object’s state. This is important for ensuring the correctness of the object’s behavior. Finally, constructors can be used to perform any other required set-up for an object before it is used.
How to define a constructor
A constructor is a member function of a class that is used to initialize objects of that class. A constructor is called when an object of the class is created. It can be used to set initial values for member variables and allocate resources for the object.
There are two ways to define a constructor in C++:
1) Default Constructor: A default constructor is a constructor with no arguments. A default constructor is automatically generated by the compiler if one is not defined by the programmer. The default constructor initializes member variables to their default values.
2) Parameterized Constructor: A parameterized constructor is a constructor with at least one argument. Parameterized constructors can be used to set initial values for member variables and allocate resources for the object.
Sample Output
Assuming we have the following program:
public class Main {
public static void main(String[] args) {
Car myObj = new Car();
System.out.println(“Brand of the car: ” + myObj.brand);
System.out.println(“Color of the car: ” + myObj.color);
System.out.println(“Number of doors on the car: ” + myObj.numDoors);
}
}
class Car {
String brand = “Ford”;
String color = “red”;
int numDoors = 4;
Car() {
//Setting field values in the constructor
brand = “Toyota”;
color = “black”;
numDoors = 2;
}
}
The output of the above program would be:Brand of the car: Toyota
Color of the car: black
Number of doors on the car: 2