Unit #2-05

Learning Outcome

At the end of this lesson, you will be able to:

• understand encapsulation and constructors

Review

• review "UML" & "Class Diagrams"

Lesson

• read "Using OOP", Chapter 9, Computer Based Problem Solving

  • read "Encapsulation" & "Constructors"

Activity

• see how constructors are used in typescript

  • https://www.typescriptlang.org/docs/handbook/2/classes.html

• see how constructors are used in Java

  • https://docs.oracle.com/javase/tutorial/java/javaOO/constructors.html

Object-Oriented Analysis & Design

• taken from this book: Head First: Object-Oriented Analysis & Design

  • or here

• read over and do the questions asked in Lesson 1 below

  • do the Airplane class in Java code only

  • once done, then look at Lesson 2 and the answers

Daily Assignment

• create a new program that has a class "Vehicle".  All vehicles have the following properties:

  • License plate number (getter and setter)

  • Colour (getter and setter)

  • # of doors (ReadOnly Property)

  • Speed (ReadOnly Property)

  • Maximum speed (ReadOnly Property)

• they also have 3 "Public" methods:

  • accelerate (accelerationPower: number, accelerationTime: number)
    • this._speed = (accelerationPower * accelerationTime) + this._speed
  • status (): string
    • returns a string like in the output, with charage returns!
  • break (breakPower: number, breakTime: number)
    • this._speed = this._speed - (breakPower * breakTime)

• have the class also have a constructor (that sets the initial state of the fields that a user can choose; things the user can not choose are just set to that value; you need to decide what these are!)

  • for example, when a vehicle is made is the colour decided by a user?

    • when a vehicle is made what is the current speed?

• create the Vehicle Class Diagram that has the above 5 private fields and 2 public methods

  • then create the class in code

• create the Vehicle class to go along with my index.ts code below!

  • YES, you just have to create the class, BUT your output MUST match mine exactly!

Extra

• do the above in a second language