chore: code

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

@@ -3,7 +3,7 @@
 import me.alex4386.gachon.sw14462.utils.Chainloader;
 
 public class Main {
-    public static String chainloadTarget = "ex9_4";
+    public static String chainloadTarget = "ex9_6";
 
     public static void main(String[] args) throws Throwable {
         String packageName = Main.class.getPackage().getName();

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_6/Employee.java

@@ -0,0 +1,43 @@
+package me.alex4386.gachon.sw14462.day18.ex9_6;
+
+public class Employee extends Person {
+    private int employeeID;
+    private String department;
+
+    public Employee(String name, int employeeID, String department) {
+        super(name);
+        this.employeeID = employeeID;
+        this.department = department;
+    }
+
+    public void writeOutput() {
+        super.writeOutput();
+        System.out.println("Employee ID: " + employeeID);
+        System.out.println("Department: " + department);
+    }
+
+    public boolean equals(Employee otherEmployee) {
+        return this.hasSameName(otherEmployee) && (this.employeeID == otherEmployee.employeeID) && this.department.equalsIgnoreCase(otherEmployee.department);
+    }
+
+    public int getEmployeeID() {
+        return employeeID;
+    }
+
+    public String getDepartment() {
+        return department;
+    }
+
+    public void setEmployeeID(int employeeID) {
+        this.employeeID = employeeID;
+    }
+
+    public void setDepartment(String department) {
+        this.department = department;
+    }
+
+    @Override
+    public String toString() {
+        return "Employee - Name: " + getName() + ", Employee ID: " + employeeID + ", Department: " + department;
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_6/Faculty.java

@@ -0,0 +1,28 @@
+package me.alex4386.gachon.sw14462.day18.ex9_6;
+
+public class Faculty extends Employee {
+    private String title;
+
+    public Faculty(String name, int employeeID, String department, String title) {
+        super(name, employeeID, department);
+        this.title = title;
+    }
+
+    public void setTitle(String newTitle) {
+        title = newTitle;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void writeOutput() {
+        super.writeOutput();
+        System.out.println("Title: " + title);
+    }
+
+    @Override
+    public String toString() {
+        return "Faculty - Name: " + getName() + ", Title: " + title;
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_6/Main.java

@@ -0,0 +1,9 @@
+package me.alex4386.gachon.sw14462.day18.ex9_6;
+
+import java.util.Arrays;
+
+public class Main {
+    public static void main(String[] args) {
+        PolymorphismDemo.main(args);
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_6/Person.java

@@ -0,0 +1,35 @@
+package me.alex4386.gachon.sw14462.day18.ex9_6;
+
+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_6/PolymorphismDemo.java

@@ -0,0 +1,18 @@
+package me.alex4386.gachon.sw14462.day18.ex9_6;
+
+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 Faculty("Dent, Arthur", 6102, "Physics", "Distinguished Professor");
+        people[2] = new Student("DeBanque, Robin", 8812);
+        people[3] = new Staff("Bugg, June", 9901, "Computer Science", 3);
+        for (Person p : people)
+        {
+            p.writeOutput();
+            System.out.println();
+        }
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_6/Staff.java

@@ -0,0 +1,28 @@
+package me.alex4386.gachon.sw14462.day18.ex9_6;
+
+public class Staff extends Employee {
+    private int payGrade;
+
+    public Staff(String name, int employeeID, String department, int payGrade) {
+        super(name, employeeID, department);
+        this.payGrade = payGrade;
+    }
+
+    public void setPayGrade(int newPayGrade) {
+        payGrade = newPayGrade;
+    }
+
+    public int getPayGrade() {
+        return payGrade;
+    }
+
+    public void writeOutput() {
+        super.writeOutput();
+        System.out.println("Pay Grade: " + payGrade);
+    }
+
+    @Override
+    public String toString() {
+        return "Staff - Name: " + getName() + ", Pay Grade: " + payGrade;
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_6/Student.java

@@ -0,0 +1,46 @@
+package me.alex4386.gachon.sw14462.day18.ex9_6;
+
+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);
+    }
+
+    @Override
+    public String toString() {
+        return "Student - Name: " + getName() + ", Student Number: " + studentNumber;
+    }
+}
+
+

src/main/java/me/alex4386/gachon/sw14462/day18/ex9_6/Undergraduate.java

@@ -0,0 +1,44 @@
+package me.alex4386.gachon.sw14462.day18.ex9_6;
+
+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);
+    }
+}