A constructor is a special method that is used to initialize a newly created object and is called just after the memory is allocated for the object.

Rules for creating a Java Constructor

It has the same name as the class

It should not return a value not even void

Example:
class Demo{
int  value1;
int value2;
Demo(){
value1=10;
value2=20;
System.ou.println("inside constructor");
}
public void display(){
System.out.prinln("value1=" +value);
System.out.prinln("value1=" +value);
}
public void main(String args[]){
Demo d = new Demo();
d.display();
}
}


Output:
Inside Constructor
value1 = 10
value2 = 20