chore: day18 exercise - partial

src/main/java/me/alex4386/gachon/sw14462/Main.java

@@ -5,7 +5,7 @@
 import java.util.*;
 
 public class Main {
-    public static String currentTarget = "day17";
+    public static String currentTarget = "day18";
     public static boolean fallbackToLatest = true;
 
     public static Map<String, Class<?>> getAvailableTargetClassNames() {

src/main/java/me/alex4386/gachon/sw14462/day17/Main.java

@@ -15,5 +15,4 @@ public static void main(String[] args) throws Throwable {
             throw e;
         }
     }
-
 }

src/main/java/me/alex4386/gachon/sw14462/day18/Main.java

@@ -0,0 +1,18 @@
+package me.alex4386.gachon.sw14462.day18;
+
+import me.alex4386.gachon.sw14462.utils.Chainloader;
+
+public class Main {
+    public static String chainloadTarget = "ex9_4";
+
+    public static void main(String[] args) throws Throwable {
+        String packageName = Main.class.getPackage().getName();
+        String chainLoadTargetClass = packageName + "." + chainloadTarget + ".Main";
+
+        try {
+            Chainloader.chainloadTarget(chainLoadTargetClass, args);
+        } catch (Exception e) {
+            throw e;
+        }
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2a/Main.java

@@ -0,0 +1,7 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2a;
+
+public class Main {
+    public static void main(String[] args) {
+        PolymorphismDemo.main(args);
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2a/Person.java

@@ -0,0 +1,35 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2a;
+
+public class Person
+{
+    private String name;
+    public Person()
+    {
+        name = "No name yet";
+    }
+
+    public Person(String initialName)
+    {
+        name = initialName;
+    }
+
+    public void setName(String newName)
+    {
+        name = newName;
+    }
+
+    public String getName()
+    {
+        return name;
+    }
+
+    public void writeOutput()
+    {
+        System.out.println("Name: " + name);
+    }
+
+    public boolean hasSameName(Person otherPerson)
+    {
+        return this.name.equalsIgnoreCase(otherPerson.name);
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2a/PolymorphismDemo.java

@@ -0,0 +1,18 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2a;
+
+public class PolymorphismDemo
+{
+    public static void main(String[] args)
+    {
+        Person[] people = new Person[4];
+        people[0] = new Undergraduate("Cotty, Manny", 4910, 1);
+        people[1] = new Undergraduate("Kick, Anita", 9931, 2);
+        people[2] = new Student("DeBanque, Robin", 8812);
+        people[3] = new Undergraduate("Bugg, June", 9901, 4);
+        for (Person p : people)
+        {
+            p.writeOutput();
+            System.out.println();
+        }
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2a/Student.java

@@ -0,0 +1,41 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2a;
+
+public class Student extends Person
+{
+    private int studentNumber;
+    public Student()
+    {
+        super();
+        studentNumber = 0;//Indicating no number yet
+    }
+    public Student(String initialName, int initialStudentNumber)
+    {
+        super(initialName);
+        studentNumber = initialStudentNumber;
+    }
+    public void reset(String newName, int newStudentNumber)
+    {
+        setName(newName);
+        studentNumber = newStudentNumber;
+    }
+    public int getStudentNumber()
+    {
+        return studentNumber;
+    }
+    public void setStudentNumber(int newStudentNumber)
+    {
+        studentNumber = newStudentNumber;
+    }
+    public void writeOutput()
+    {
+        System.out.println("Name: " + getName());
+        System.out.println("Student Number: " + studentNumber);
+    }
+    public boolean equals(Student otherStudent)
+    {
+        return this.hasSameName(otherStudent) &&
+                (this.studentNumber == otherStudent.studentNumber);
+    }
+}
+
+

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2a/Undergraduate.java

@@ -0,0 +1,45 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2a;
+
+
+public class Undergraduate extends Student
+{
+    private int level; //1 for freshman, 2 for sophomore //3 for junior, or 4 for senior.
+    public Undergraduate()
+    {
+        super();
+        level = 1;
+    }
+    public Undergraduate(String initialName,
+                         int initialStudentNumber, int initialLevel)
+    {
+        super(initialName, initialStudentNumber); setLevel(initialLevel); //checks 1 <= initialLevel <= 4
+    }
+    public void reset(String newName, int newStudentNumber,
+                      int newLevel)
+    {
+        reset(newName, newStudentNumber); //Student's reset setLevel(newLevel); //Checks 1 <= newLevel <= 4
+    }
+    public int getLevel()
+    {
+        return level;
+    }
+    public void setLevel(int newLevel)
+    {
+        if ((1 <= newLevel) && (newLevel <= 4))
+            level = newLevel;
+        else
+        {
+            System.out.println("Illegal level!");
+            System.exit(0);
+        } }
+    public void writeOutput()
+    {
+        super.writeOutput();
+        System.out.println("StudentLevel: " + level);
+    }
+    public boolean equals(Undergraduate otherUndergraduate)
+    {
+        return equals((Student)otherUndergraduate) &&
+        (this.level == otherUndergraduate.level);
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2b/Circle.java

@@ -0,0 +1,22 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2b;
+
+public class Circle extends Shape {
+    private double radius;
+
+    public Circle(double radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI * Math.pow(radius, 2);
+    }
+
+    public String toString() {
+        return "Circle: radius=" + radius;
+    }
+
+    public boolean equals(Circle obj) {
+        return this.radius == obj.radius;
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2b/Main.java

@@ -0,0 +1,17 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2b;
+
+public class Main {
+    public static void main(String[] args) {
+        Shape[] shapes = new Shape[4];
+        shapes[0] = new Rectangle(10, 20);
+        shapes[1] = new Circle(10);
+        shapes[2] = new RightTriangle(10, 20);
+        shapes[3] = new Shape();
+
+        for (Shape s : shapes) {
+            System.out.println(s);
+            System.out.println("Area: " + s.getArea());
+            System.out.println();
+        }
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2b/Rectangle.java

@@ -0,0 +1,25 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2b;
+
+public class Rectangle extends Shape {
+    private double width;
+    private double height;
+
+    public Rectangle(double width, double height) {
+        this.width = width;
+        this.height = height;
+    }
+
+    @Override
+    public double getArea() {
+        return width * height;
+    }
+
+    @Override
+    public String toString() {
+        return "Rectangle: width=" + width + ", height=" + height;
+    }
+
+    public boolean equals(Rectangle obj) {
+        return this.width == obj.width && this.height == obj.height;
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2b/RightTriangle.java

@@ -0,0 +1,25 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2b;
+
+public class RightTriangle extends Shape {
+    private double width;
+    private double height;
+
+    public RightTriangle(double width, double height) {
+        this.width = width;
+        this.height = height;
+    }
+
+    @Override
+    public double getArea() {
+        return width * height / 2;
+    }
+
+    @Override
+    public String toString() {
+        return "RightTriangle: width=" + width + ", height=" + height;
+    }
+
+    public boolean equals(RightTriangle obj) {
+        return this.width == obj.width && this.height == obj.height;
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_2b/Shape.java

@@ -0,0 +1,7 @@
+package me.alex4386.gachon.sw14462.day18.ex9_2b;
+
+public class Shape {
+    public double getArea() {
+        return 0.0;
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_3/Billing.java

@@ -0,0 +1,43 @@
+package me.alex4386.gachon.sw14462.day18.ex9_3;
+
+public class Billing {
+    private Patient patient;
+    private Doctor doctor;
+
+    private int visitCount;
+
+    public Billing(Patient patient, Doctor doctor) {
+        this.patient = patient;
+        this.doctor = doctor;
+
+        this.visitCount = 0;
+    }
+
+    public Patient getPatient() {
+        return this.patient;
+    }
+
+    public void setPatient(Patient patient) {
+        this.patient = patient;
+    }
+
+    public Doctor getDoctor() {
+        return this.doctor;
+    }
+
+    public void setDoctor(Doctor doctor) {
+        this.doctor = doctor;
+    }
+
+    public void visit() {
+        this.visitCount++;
+    }
+
+    public int getVisitCount() {
+        return this.visitCount;
+    }
+
+    public double getIncome() {
+        return this.visitCount * this.doctor.getVisitFee();
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_3/Doctor.java

@@ -0,0 +1,54 @@
+package me.alex4386.gachon.sw14462.day18.ex9_3;
+
+import me.alex4386.gachon.sw14462.day17.ex9_1b.Person;
+
+public class Doctor extends Person {
+    private DoctorSpeciality speciality;
+    private double visitFee = 0.0;
+
+    public Doctor() {
+        super();
+        this.speciality = null;
+        this.visitFee = 0.0;
+    }
+
+    public Doctor(String initialName, DoctorSpeciality speciality, double visitFee) {
+        super(initialName);
+        this.speciality = speciality;
+        this.visitFee = visitFee;
+    }
+
+    public void setSpeciality(DoctorSpeciality speciality) {
+        if (speciality == null) {
+            throw new IllegalArgumentException("Speciality cannot be null");
+        }
+
+        this.speciality = speciality;
+    }
+
+    public DoctorSpeciality getSpeciality() {
+        return this.speciality;
+    }
+
+    public void setVisitFee(double visitFee) {
+        if (visitFee < 0) {
+            throw new IllegalArgumentException("Visit Fee cannot be negative");
+        }
+
+        this.visitFee = visitFee;
+    }
+
+    public double getVisitFee() {
+        return this.visitFee;
+    }
+
+    @Override
+    public String toString() {
+        return "Doctor: " + this.getName() + ", Speciality: " + this.getSpeciality() + ", Visit Fee: " + this.getVisitFee();
+    }
+
+    public boolean equals(Doctor otherDoctor) {
+        return this.hasSameName(otherDoctor) && this.getSpeciality() == otherDoctor.getSpeciality() && this.getVisitFee() == otherDoctor.getVisitFee();
+    }
+
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_3/DoctorSpeciality.java

@@ -0,0 +1,8 @@
+package me.alex4386.gachon.sw14462.day18.ex9_3;
+
+public enum DoctorSpeciality {
+    MEDICINE,
+    SURGERY,
+    DENTIST,
+    ORIENTAL;
+}