UGStudent.java

// Inherits from Student and implements calculateGrade() based on UG rules
public class UGStudent extends Student {

    // Constructor calls base class constructor to initialize fields
    public UGStudent(String name, int rollNo, int marks) {
        super(name, rollNo, marks);
    }

    // Calculate grade for UG student
    @Override
    public char calculateGrade() {
        if (marks >= 85) return 'A';
        else if (marks >= 70) return 'B';
        else if (marks >= 50) return 'C';
        else return 'F';
    }

    // Display UG student details
    @Override
    public void display() {
        System.out.println("UG Student | Name: " + name +
                " Roll: " + rollNo +
                " Marks: " + marks +
                " Grade: " + calculateGrade());
    }
}