Inside the constructor of a class we can call another constructor of that class, using this(), and it will be called based on the parameters in gets as input.
class Student{
public int Age;
public int grade;
public int classNumber;
public Student(int Age, int grade){
this.Age = Age;
this.grade = grade;
}
public Student(int classNumber){
this.(0,0);
this.classNumber = classNumber;
}
}