Java 2 exercises

import java.io.*; public class Activity6C { public static void main(String[] args) { Student[] students = new Student[4]; students[0] = new UndergradStudent(8032, "Casper", 2.78, 2); students[1] = new GraduateStudent(3044, "Sheena", 3.92, "Natural Language Processing"); students[2] = new UndergradStudent(6170, "Yolanda", 4.26, 3); students[3] = new GraduateStudent(1755, "Geordi", 3.58, "Human-Computer Interaction"); printStudents(students); printDeansList(students); System.out.println("\nEnd of processing."); } public static void printStudents(Student[] students) { System.out.println("\nList of all students:\n"); for (int i = 0; i < students.length; i++) { System.out.println(i + 1 + ": " + students[i]); } } public static void printDeansList(Student[] students) { System.out.println("\nDean's honour list:\n"); for (int i = 0; i < students.length; i++) { if (students[i].deansHonourList()) { System.out.println(students[i]); } } } } class Student { private int number; private String name; private double gpa; public Student(int number, String name, double gpa) { this.number = number; this.name = name; this.gpa = gpa; } public double getGPA() { return gpa; } public boolean deansHonourList() { return false; } public String toString() { return number + " " + name + " (" + gpa + ")"; } } class UndergradStudent extends Student { private int year; public UndergradStudent(int number, String name, double gpa, int year) { super(number, name, gpa); this.year = year; } public boolean deansHonourList() { boolean result = false; if (getGPA() >= 3.5) result = true; return result; } public String toString() { return "Undergraduate: " + super.toString() + " year: " + year; } } class GraduateStudent extends Student { private String thesis; public GraduateStudent(int number, String name, double gpa, String thesis) { super(number, name, gpa); this.thesis = thesis; } public boolean deansHonourList() { boolean result = false; if (getGPA() >= 3.75) result = true; return result; } public String toString() { return "Graduate: " + super.toString() + " thesis: " + thesis; } }