IMPORTANT: Do not use Visual Studio to answer the coding questions.

• What is an interface?

• What is polymorphism? Describe an example?

• What is the difference between a class and an object?

• What are the four pillars of OOP?

• What is an abstract class?

• What is the difference between an abstract class and an interface?

• TRUE or FALSE: an abstract class can be instantiated?

• TRUE or FALSE: an abstract class can have a constructor?

• Is a string a value type or a reference type?

• What is the package management system used in Visual Studio?

• After the following method executes and is completed what will be the value of the Name property of the Employee parameter object?

public static void UpdateEmployee(Employee employee)
{
    employee.Name = "Harry Potter";
}

• Will the Employee parameter object in the following method become null after the method executes and is completed? Why or why not?

public static void NullEmployee(Employee employee)
{
    employee = null;
}

• In the Employee.cs file in this folder, create a class named Employee with the properties to hold the following info:

  • first name
  • last name
  • hire date
  • email

• In the Program.cs file in this folder, create an Employee object from the class defined above. Give this object the following information:

  • first name: Harry
  • last name: Potter
  • hire date: 1/1/2015
  • email: [email protected]

• Take the Employee class created from the previous example and override the ToString() method to return a string representation of the properties. Use string interpolation.

• Create a static method on the Employee class named CloneEmployee that takes an Employee object as a parameter and returns a deep copy. Demonstrate using this method in the Program.cs file in this folder.

• Create a method on the Employee class that returns the number of days an employee has been employed. Demonstrate using this method in the Program.cs file in this folder.

• In the Program.cs file in this folder, create a list of Employee objects. Add three Employee objects to the list. Iterate over the list of objects and call each object's ToString() method on each iteration.