Unit #2-09

Learning Outcome

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

• understand polymorphism

Review

• review "Class Diagrams"

Lesson

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

  • read "Polymorphism"

Activity

• null

Object-Oriented Analysis & Design

• read over and do Lesson 6

Daily Assignment

• for your Vehicle class, using "polymorphism" to change your "brake" methods:

  • vehicle class uses the same old way

  • bike uses its original brake method

  • truck uses a new brake method; since it has air brakes:

    • we had:
      Provide_Air(airPressure: number)

    • now make this the actual new brake method:

      • break (breakPower: number, breakTime: number, airPressure: number)

      • this._speed = this._speed - (breakPower * breakTime) - (airPressure * breakTime)

• then change your stub program to use each one of these new methods

Extra

• do the above in a second language