Student3.java

class Student3 {
    private String name;
    private int ID;
    private double GPA;

    public Student3(String name, int ID, double GPA) {
        this.name = name;
        this.ID = ID;
        this.GPA = GPA;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getID() {
        return ID;
    }

    public void setID(int ID) {
        this.ID = ID;
    }

    public double getGPA() {
        return GPA;
    }

    public void setGPA(double GPA) {
        this.GPA = GPA;
    }

    public void displayInfo() {
        System.out.println("Name: " + name);
        System.out.println("ID: " + ID);
        System.out.println("GPA: " + GPA);
    }

    public static void main(String[] args) {
        UndergraduateStudent undergrad = new UndergraduateStudent("John Doe", 1001, 3.5, 2);
        GraduateStudent grad = new GraduateStudent("Jane Smith", 2001, 3.8, "Computer Science");
        DoctoralStudent doc = new DoctoralStudent("Michael Johnson", 3001, 4.0, "Physics", "Quantum Mechanics");

        System.out.println("Undergraduate Student:");
        undergrad.displayInfo();
        System.out.println("\nGraduate Student:");
        grad.displayInfo();
        System.out.println("\nDoctoral Student:");
        doc.displayInfo();
    }
}