Added Student and UseStudent classes

src/tp04/Student.java

+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package tp04;
+
+import java.util.Arrays;
+
+/**
+ *
+ * @author ethan
+ */
+public class Student {
+
+    private Person pers;
+    private double[] grades;
+
+    private int realGradeLength() {
+        int count = 0;
+        for (int i = 0; i < this.grades.length; i++) {
+            if (this.grades[i] != -1.0) {
+                count++;
+            }
+        }
+        return count;
+    }
+
+    public Student(Person pers, double[] grades) {
+        this.pers = pers;
+        this.grades = grades;
+    }
+
+    public Student(String forename, String name, double[] grades) {
+        this.pers = new Person(forename, name);
+        this.grades = grades;
+    }
+
+    public Student(String forename, String name, double grade) {
+        this.pers = new Person(forename, name);
+        this.grades = new double[]{grade};
+    }
+
+    public String getName() {
+        return this.pers.getName();
+    }
+
+    public String getForename() {
+        return this.pers.getForename();
+    }
+
+    public void setName(String newName) {
+        this.pers.setName(newName);
+    }
+
+    public void setForename(String newForename) {
+        this.pers.setForename(newForename);
+    }
+
+    public int getID() {
+        return this.pers.getID();
+    }
+
+    public String toString() {
+        String gradesString = "[";
+        for (int i = 0; i < this.grades.length; i++) {
+            gradesString += this.grades[i];
+            if (i < this.grades.length - 1) {
+                gradesString += ", ";
+            }
+        }
+        gradesString += "]]";
+        return "Student[" + this.pers + " = " + gradesString;
+    }
+
+    public double[] getGrades() {
+        return this.grades;
+    }
+
+    public boolean equals(Object other) {
+        if (other == null) {
+            return false;
+        }
+        if (other.getClass() == this.getClass()) {
+            Student otherStudent = (Student) other;
+            boolean arrayEquals = true; 
+            double[] otherStudentGrades = otherStudent.getGrades();
+            if (otherStudentGrades.length == this.grades.length) {
+                for (int i = 0; i < this.grades.length; i++) {
+                    arrayEquals = this.grades[i] != otherStudentGrades[i];
+                }
+            }
+            return otherStudent.getID() == this.pers.getID() && arrayEquals;
+        }
+        return false;
+    }
+
+    public double getAverage() {
+        double sum = 0.0;
+        for (int i = 0; i < this.grades.length; i++) {
+            if (this.grades[i] != -1.0) {    
+                sum += this.grades[i];
+            }
+        }
+        return sum / this.realGradeLength();
+    }
+
+    public void addGrade(double grade) {
+        if (this.grades.length != this.realGradeLength()) {
+            for (int i = 0; i < this.grades.length; i++) {
+                if (this.grades[i] == -1.0) {
+                    this.grades[i] = grade;
+                }
+            }
+        } else {
+            this.grades = Arrays.copyOf(this.grades, this.grades.length + 1);
+            this.grades[this.grades.length - 1] = grade;
+        }
+    }
+
+}

src/tp04/UseStudent.java

+package tp04;
+
+public class UseStudent {
+    public static void main (String[] args) {
+        Person person1 = new Person("John", "Doe");
+        Student student1 = new Student(person1, new double[]{12.5, 14.0});
+        Student student2 = new Student(person1, new double[]{12.5, 14.5});
+        Student student3 = new Student("Jane", "Smith", 14.0);
+        
+        System.out.println("student1 == student2: " + student1.equals(student2));
+        System.out.println("student1 == student3: " + student1.equals(student3));
+        System.out.println("student2 == student3: " + student2.equals(student3));
+    }
+}