COP3337
  Section U05
  Spring 2017


                      A Program for Hw #1
                      ===================



  I. The Person class
  -------------------

  // a person has a name an an age, the get and set methods, and
  // the toString and equals methods
  public class Person
  {
      // the fields
      private String name;
      private int age;

      // construct an object with name n and age ag
      public Person(String n, int ag)
      {
          name = n;
          age = ag;
      }

      // the get methods
      // return the name
      public String getName()
      {
          return name;
      }
      // return the age
      public int getAge()
      {
          return age;
      }

      // the set methods
      // set the name to n
      public void setName(String n)
      {
          name = n;
      }

      // set the age to ag
      public void setAge(int ag)
      {
          age = ag;
      }

      // the toString method
      public String toString()
      {
         return getClass().getSimpleName() + "[name = " + name +
           "][age = " + age + "]";
      }

      // 2 persons are equal if other is not null, the 2 objects belong to
      // the same class and they have the same name and age
      public boolean equals(Person other)
      {
          // check for null
          if (other == null)
              return false;
          // check if they have the same class
          if ( getClass() != other.getClass())
              return false;
          // check that the fields are equal
          return name.equals(other.name) && age == other.age;
      }
  }

  II. The Employee Class
  ----------------------

  // the class Employee has 3 fields, company, position, and boss
  // a constructor, and the methods getCompany, getPosition,
  // getBoss, toString, equals and getCEO
  public class Employee extends Person
  {
      // the fields
      private String company;
      private String position;
      private Employee boss; // null if the CEO

      // construct an employee with name n, age ag,
      // company co, position pos, and boss b
      public Employee(String n, int ag, String co, String pos, Employee b)
      {
          super(n,ag); // form the super class
          company = co; // set the fields of the subclass 
          position = pos;
          boss = b;
      }

      // return the company
      public String getCompany()
      {
          return company;
      }

      // return the position
      public String getPosition()
      {
          return position;
      }
      // return the boss
      public Employee getBoss()
      {
          return boss;
      }

      // return the CEO
      public Employee getCEO()
      {
          // if current's boss is not null check his boss
          Employee current = this;
          while (current.boss != null)
              current = current.boss;
          return current;
      }

      // toString returns the name, the age, the company,
      // the position, and the name of the boss, or the word none
      // if this is the CEO. Use super.toString()
      public String toString()
      {
          // check if this is the CEO
          if (boss != null)
              return super.toString() + "[company = " + company +
                  "][position = " + position + "][boss = " + boss.getName()
                  + "]";
          else
              return super.toString() + "[company = " + company +
                  "][position = " + position + "][boss = none]";
      }

      // two employee are equal if they have the same name, age, company and
      // position. Use super.equals and beware that other can be null.
      public boolean equals(Employee other)
      {
          if (other == null)
              return false;
          return super.equals(other) && company.equals(other.company)
              && position.equals(other.position);
      }

  }

  III. The Driver
  ---------------

  // the driver for COP3337 Hw1
  public class Spring16cop3337Testhw1 
  {

      public static void main(String[] args) 
      {
          System.out.println("Have Some Pizza");
          System.out.println("===============\n\n");
        
          // a list of employees
          Employee papaBill = new Employee("Papa Bill", 76, "Papa Bill's Pizza",
              "owner", null);
          Employee mark = new Employee("Mark", 53, "Papa Bill's Pizza",
              "manager", papaBill);
          Employee karen = new Employee("Karen", 72, "Papa Bill's Pizza",
              "cashier", mark);
          Employee susan = new Employee("Susan", 40, "Papa Bill's Pizza",
              "server", mark);
          Employee tomato = new Employee("Tomato", 40, "Papa Bill's Pizza",
              "baker", mark);
          Employee naph = new Employee("Naph", 50, "Papa Bill's Pizza",
              "driver", papaBill);
          Employee jay = new Employee("Jay", 65, "Jay's Pizza", "owner", null);
          Employee susan2 = new Employee("Susan", 40, "Jay's Pizza",
              "server", jay);
        
          // print the employees
          Employee[] group = { mark, susan, susan2, papaBill, jay, naph, karen,
              tomato};
          System.out.println("The pizza persons:");
          System.out.println("------------------");
          for (Employee e: group)
              System.out.println(e.toString());
        
          // find the CEO's
          try
          {
              System.out.println("\nJay's CEO is " + jay.getCEO() + ".");
          }
          catch (NullPointerException e)
          {
              System.out.println("Oh, no! You did not find Jay's boss.");            
          }    
          try
          {
              System.out.println("Tomato's CEO is " + tomato.getCEO() + ".");
          }
          catch (NullPointerException e)
          {
              System.out.println("Oh, no! You did not find Tomato's boss.");            
          }    
        
          // declare some pizza lovers
          Person bill2 = new Person("Papa Bill", 76);
          Person mark2 = new Person("Mark", 46);
          Person mark3 = new Person("Mark", 46);
          Person mark4 = new Person("Mark", 53);
          Employee tomatito = new Employee("Tomato", 40, "Papa Bill's Pizza",
              "baker", mark);
          Employee tomate = new Employee("Tomato", 40, "Papa Bill's Pizza",
              "baker", papaBill);
          Employee veggie = new Employee("Tomato", 40, "Papa Bill's Pizza",
              "driver", mark);
          Person anotherTomato = new Person("Tomato",40);
          Person retired = null;
        
          System.out.println("The pizza lovers:");
          System.out.println("-----------------");
          Person[] eaters = { mark4, mark2, bill2, mark3};
          for (Person p : eaters)
              System.out.println(p);
        
          // test getBoss
          System.out.println("\nJay's boss is " + jay.getBoss());
          System.out.println("Mark's boss is " + mark.getBoss());
          System.out.println("Tomato's boss is " + tomato.getBoss() + ".");
        
          // test equals
          System.out.println("\npapaBill.equals(bill2) is " + 
               papaBill.equals(bill2));
          System.out.println("susan.equals(susan2) is " + susan.equals(susan2));
          System.out.println("mark2.equals(mark3) is " + mark2.equals(mark3));
          System.out.println("mark2.equals(mark4) is " + mark2.equals(mark4));
          System.out.println("mark2.equals(mark4) is " + mark2.equals(mark4));
          try
          {
              System.out.println("tomato.equals(tomatito) is " +
                      tomato.equals(tomatito));
          }    
          catch(NullPointerException e)
          {
              System.out.println("Oh no! You got a null pointer exception.");
          }    

          try
          {
              System.out.println("tomato.equals(tomate) is " + tomato.equals(tomate));
          }

          catch(NullPointerException e)
          {
              System.out.println("Oh no! You got a null pointer exception.");
          }    
        
          try
          {
              System.out.println("anotherTomato.equals(retired) is " + 
                      anotherTomato.equals(retired));
          }    
          catch(NullPointerException e)
          {
            System.out.println("Oh no! You got a null pointer exception.");
          }    
      }
    
  }

  IV. The Output:
  ---------------

  run:
  Have Some Pizza
  ===============


  The pizza persons:
  ------------------
  Employee[name = Mark][age = 53][company = Papa Bill's Pizza][position = manager][boss = Papa Bill]
  Employee[name = Susan][age = 40][company = Papa Bill's Pizza][position = server][boss = Mark]
  Employee[name = Susan][age = 40][company = Jay's Pizza][position = server][boss = Jay]
  Employee[name = Papa Bill][age = 76][company = Papa Bill's Pizza][position = owner][boss = none]
  Employee[name = Jay][age = 65][company = Jay's Pizza][position = owner][boss = none]
  Employee[name = Naph][age = 50][company = Papa Bill's Pizza][position = driver][boss = Papa Bill]
  Employee[name = Karen][age = 72][company = Papa Bill's Pizza][position = cashier][boss = Mark]
  Employee[name = Tomato][age = 40][company = Papa Bill's Pizza][position = baker][boss = Mark]

  Jay's CEO is Employee[name = Jay][age = 65][company = Jay's Pizza][position = owner][boss = none].
  Tomato's CEO is Employee[name = Papa Bill][age = 76][company = Papa Bill's Pizza][position = owner][boss = none].
  The pizza lovers:
  -----------------
  Person[name = Mark][age = 53]
  Person[name = Mark][age = 46]
  Person[name = Papa Bill][age = 76]
  Person[name = Mark][age = 46]

  Jay's boss is null
  Mark's boss is Employee[name = Papa Bill][age = 76][company = Papa Bill's Pizza][position = owner][boss = none]
  Tomato's boss is Employee[name = Mark][age = 53][company = Papa Bill's Pizza][position = manager][boss = Papa Bill].

  papaBill.equals(bill2) is false
  susan.equals(susan2) is false
  mark2.equals(mark3) is true
  mark2.equals(mark4) is false
  mark2.equals(mark4) is false
  tomato.equals(tomatito) is true
  tomato.equals(tomate) is true
  anotherTomato.equals(retired) is false
  BUILD SUCCESSFUL (total time: 1 second)