(feat) Implement Exercise 3 - Student and Lecturer child classes

week23.java

@@ -163,4 +163,56 @@ class DemoBankAccount {
     }
 }
 
+class Student extends Person {
+    private double gpa;
 
+    public double getGpa() {
+        return gpa;
+    }
+
+    public void setGpa(double gpa) {
+        this.gpa = gpa;
+    }
+
+    @Override
+    public String toString() {
+        return "Student [gpa=" + gpa + ", name=" + this.getName() + "]";
+        // Ah, we can't access private members of parent classes from the child class
+    }
+}
+
+class Lecturer extends Person {
+    private double salary;
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+
+    @Override
+    public String toString() {
+        return "Lecturer [salary=" + salary + ", name=" + this.getName() + "]";
+    }
+}
+
+/**
+ * Exercise 3.1, 3.2, 3.3 - implement Student and Lcturer classes
+ *
+ */
+class DemoStudentLecturer {
+    public static void main(String[] args) {
+        Student adrian = new Student();
+        adrian.setName("Adrian");
+        adrian.setGpa(3.5);
+
+        Lecturer trefusis = new Lecturer();
+        trefusis.setName("Donald");
+        trefusis.setSalary(24199);
+
+        System.out.println(String.format("At a particular Oxbridge college, we have two people"));
+        System.out.println(String.format("%s\t\t&\t\t%s", adrian, trefusis));
+    }
+}