MyClass.java
Person.java
 

class MyClass {
  public static void main(String[] args) {
    // create an object of the Student class (which inherits attributes and methods from Person)
    Student myObj = new Student(); 
    
    System.out.println("Name: " + myObj.fname);
    System.out.println("Age: " + myObj.age);
    System.out.println("Graduation Year: " + myObj.graduationYear);
    myObj.study(); // call abstract method
  }
}

Result:
Name: John
Age: 24
Graduation Year: 2018
Studying all day long