Unit #2-07

Learning Outcome

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

• understand inheritance and how to use it correctly

Review

• review "Encapsulation" & "Constructors"

Lesson

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

  • read "Inheritance"

Activity

• null

Object-Oriented Analysis & Design

• read over and do Lesson 4 (answers from yesterday)

Daily Assignment

• use the "Vehicle" class from before

  • create 3 new classes that inherit from "Vehicle Class"

    • Vehicle (from before!)

    • Truck

    • Bike

  • here are some properties and methods:

    • Vehicle

      • properties:

        • Color: string

        • Speed: number (getter only)

        • Maximum speed:number (getter only)

        • (remove the other properties you had!)

      • methods:

        • Accelerate(accelerationPower: number, accelerationTime: number): void

          • same logic as before

        • Brake(breakPower: number, breakTime: number): void

          • same logic as before

    • Truck

      • properties:

        • licensePlateNumber: string

        • doors: int = 2

      • methods:

        • Provide_Air(airPressure: number) 

          • this.speed = this.speed - airPressure / 2

    • Bike

      • properties:

        • cadence: number
          gear: number

      • methods:

        • acceelerate (appliedPower: number, newGear: number)

          • this.cadense = this.cadense + appliedPower
            this.speed = this.speed + (this.cadense * this.gear)

          • it completely overrides the existing method!

        • ringBell()

          • return "Ding ding!\n"

• us the provided index.ts to create your 3 classes

  • using inheritance

Extra

• do the above in a second language