public class Person

{

Person ( )

{

System.out.println("Introduction:");

}

Person(String name)

{

System.out.println("Name: " +name);

}

Person(String dept, int rollNo)

{

System.out.println("Department: "+dept+ ", "+"Roll no:"+rollNo);

}

public static void main(String[ ] args)

{

Person p1 = new Person( ); 

Person p2 = new Person("Ravi");

Person p3 = new Person("CSE", 123);

}

}