copy constructors

public class copyconstructors {

    public static void main(String[] args) {

        Student s1 = new Student();

        s1.name = "abhi";

        s1.roll = 71;

        System.out.println(s1.name);

        System.out.println(s1.roll);

        Student s2 = new Student(s1);

        System.out.println(s2.name);

        System.out.println(s2.roll);

    }

}

class Student {

    int roll;

    String name;

    Student() {

        this.name = name;

        this.roll = roll;

    }

     //COPY CONSTRUCTOR

    Student(Student s1) {

        this.name = s1.name;

        this.roll = s1.roll;

    }

}