What is the use of Constructor

Answer 1

Ytbarek Gebre
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A 'constructor' initializes an object when it is created. It has the same name as its class and is syntactically similar to a method.

However, constructors have no explicit return type. The general form of a constructor is:

access class-name(param-list) {
// constructor code
}

Typically, you will use a constructor to give initial values to the instance variables defined by the class or to perform any other startup procedures required to create a fully formed object.
Also, usually, access is 'public' because constructors are normally called from outside their class. The param-list can be empty, or it can specify one or more parameters.

All classes have constructors, whether you define one or not, because C# automatically provides a default constructor that causes all member variables to be initialized to their default values.

Answer 2

creating objects of the defined class initiating data members and calling constructors of the parents if the class extends any other classes

Answer 3

So when you create a class usually you will have⬇

public class Car{
//empty fields⬇
String model;
int year;}

The best way to initalize these fields is with the constructor.

public class Car{

String model;
int year;

//constructor method⬇
Car(String model, int year){
this.model= model;
this.year=year;}

}

Now when you create an instance of class a call to the constructor is made which initalize the fields for your new instance.

Car mini = new Car("mini",1997);

System.out.print(mini.year);

Answer 4

Initalize an instance of an class (object) with an valid state.

Answer 5

You can overload the constructor to use different number or type of parameters to instantiate object of the class. This leads to run-time polymorphism... 🤔

Answer 6

You can use constructors to create objects with special methods.

You can define how the created object behaves for any operators.

You can make a program to print "Hello world!" When an object is divided by 5.
You can make a program to print "SoloLearn" when an object is compared.

Answer 7

The visibility is NOT usually public. In OOP you often use other qualifiers to hide the constructors that have technical relevance only.