Lec 14 Writing an Instantiable Class III

Agenda

• Review of Instantiable Classes• Scope of variables• Using this to override scope issues • Lab: Creating a Car class for a video game

Recall Structure of an Instantiable Class

class Balloon

sizecolor

BallooninflategetSizegetColorsetColorpop

Class NameInstance Varbls

Methods

Constructor methodsame name as class

Structure of an Instantiable Dog Class

class Dog

size

DoggetSizesetSizebark

Class NameInstance Varbls

Methods

Constructor methodsame name as class

Now we'll begin ScopeThisDog Demo

• create Dog and MainApp classes• show how scope errors can cause compile

failure• scope of

– instance variables, parameters, and local variables• Using keyword this to resolve scope issues

in Class definition files

Scope errors in code below

Memory Map

Dog fido = new Dog(30);

Lab14 You write a Car Class

class Car

double speed;int turnRate;

CargetSpeedgetTurnRateaccelerateturnMoreLeftturnMoreRight

Class NameInstance Varbls

Methods

Constructor methodsame name as class