When calling a constructor from a constructor, we use the 'this' keyword. The 'this' keyword refers to the class name. Then how are the values set in the object when we are only referring to the class and not the object?

```
Student random = new student();
class Student {
  int roll;

  student() {
    this student(13);
  }

  student(int roll) {
    this.roll = roll;
  }
}

```