est.java

abstract class Person {
    String name;
    int age;

    Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    abstract void displayDetails();
}

class Student extends Person {
    String course;

    Student(String name, int age, String course) {
        super(name, age);
        this.course = course;
    }

    void displayDetails() {
        System.out.println("Student: " + name + ", Age: " + age + ", Course: " + course);
    }
}

class Teacher extends Person {
    String subject;

    Teacher(String name, int age, String subject) {
        super(name, age);
        this.subject = subject;
    }

    void displayDetails() {
        System.out.println("Teacher: " + name + ", Age: " + age + ", Subject: " + subject);
    }
}

public class est {
    public static void main(String[] args) {
        Person p;
        p = new Student("Arya", 21, "Computer Science");
        p.displayDetails();
        p = new Teacher("Mr. Sharma", 45, "Java");
        p.displayDetails();
    }
}