The Significance of Using Constructor In Java

Constructor:-

A constructor is a non-static member function of a class declared with the same name as the name of the class. It is a nor return type function and a constructor is used to initialize the objects of class.

Non-Static function:-In java if we define a function without using any keyword then by default it is a non-static function.

Syntax:-

class Documentation {

Documentation () {

}

}

Explanation of above syntax:- A class is created with name "Documentation" and having a constructor "Documentation" with same name as class name and it is a non-static function.

Key Features:-

1- When no constructor is defined in the program then the compiler provides the default constructor for the class.

2- Constructor can be parameterized.

3- Constructor can be overloaded which mean we can define more than one constructor in a class.

Types:-

1. Parameterized Constructor
2. Non-Parameterized Constructor

Parameterized Constructor:-

A constructor defined by passing arguments then is known as a parameterized constructor.

Example:-

class Constructor {

int a;

Constructor(int a ) { //Parameterized constructor

a = i;

}

}

public class Cons {

public static void main(String args[]) {

Constructor c1 = new Constructor();

c1.Constructor(55)

System.out.println(a);

}

}

Explanation of above code:-

A class "Constructor" is created and having a parameterized constructor define with same name as the name of class "Constructor(int a)" where "int a" is a parameter so, it is called as parameterized constructor and in class "Cons" a constructor is called with the help of object "c1" of class "Constructor".

Output:-55

Non-Parameterized Constructor:-

A constructor defined without passing argument is then known as a non-parameterized constructor.

Example:-

Class Rectangle{

private int l,b,h;

public Rectangle() { //Non-Parameterized Constructor

l=10;

b=10;

h=10;

}

}

public class Construct {

public static void main(String args[]) {

Rectangle b1 = new Rectangle();

b1.Box()

System.out.println("Length of box : "+l);

System.out.println("Breadth of box : "+b);

System.out.println("Height of box : "+h);

}

}

Output:-

Length of box : 10

Breadth of box : 10

Height of box : 10

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