Constructors – TecAdmin

A constructor is a special method created with the same name as the class name and no return type. It is used to initialize a class object.

If no constructor defined in the class, Java called a default constructor to initialize an object with default values. For example, any int variable initializes with 0 and object initialized with null.

Rules for Constructors:

Any constructor(s) of a class must have the same name as the class name in which it resides.
A constructor in Java cannot be static, abstract, final, and Synchronized.
A constructor has no return type even void.

Example of Constructor in Java

class Hello{
	String name;
	int age;

	Hello(){
	    name="Rahul";
	    age=28;
	    System.out.println("Running constructor");
	}

	public void display()
	{
		 System.out.println("Welcome " + name + ", Age " + age );
	}		 

	public static void main(String args[]){
	  ConstDemo cdemo = new ConstDemo();
	  cdemo.display();
	}
}

class Hello{

String name;

int age;

Hello(){

name="Rahul";

age=28;

System.out.println("Running constructor");

}

public void display()

{

System.out.println("Welcome " + name + ", Age " + age );

}

public static void main(String args[]){

ConstDemo cdemo = new ConstDemo();

cdemo.display();

}