Java

OOP GUIDES / WORK

Basic Objects – Instance variables – Instance methods – Constructors – Encapsulation – Object arrays – Aggregation

SHORT ANSWER QUESTIONS

Topic	Work	Solutions
1 – Basic Objects (Instance Variables)	Work	Solutions
2 – Constructors	Work	Solutions
3 – Instance Methods	Work	Solutions
4 – Data Encapsulation	Work	Solutions
5 – Aggregation	Work	Solutions
6 – Object Arrays	Work	Solutions

GUIDES / TASKS

Point class	-Intro to instance variables	Solutions
Circle class	-Instance variables -Constructor -Creating objects (instances) -Note: Used in Lesson 11.36	Solutions
Card class	-Instance variables -Constructor -Creating objects (instances) -Note: Used in Lesson 11.36	Solutions
Dog class	-Intro to instance variables -Intro to instance methods -toString() method	Solutions
Dice class	-Implementing instance methods -Using this -toString() method -Note: Used in Lesson 12.11	Solutions
Circle class 2	-Instance variables -Constructors -Constructor overloading -Using objects as parameters -Note: Used in Lesson 11.37	Solutions
SingleTable class	-Constructor -Instance method implementation -Note: Used in Lesson 12.11	Solutions
Dude class	-Analyzing code -Creating objects -Note: Used in Lesson 11.38	Solutions
Circle class 3	-Adding instance methods to a class -Creating objects -Note: Used in Lesson 11.38	Solutions
Card class 2	-Adding instance methods to a class -Creating objects -Note: Used in Lesson 11.38	Solutions
RoundTable class	-Creating a simple class -Creating objects -Note: Used in Lesson 11.38	Solutions
Card class 3	-Using objects to create programs -Note: Used in Lesson 11.38	Solutions
BankAccount class	-Creating a simple class -Creating objects -Note: Used in Lesson 11.39	Solutions
Counter class	-Creating a simple class -Creating objects -Note: Used in Lesson 11.39	Solutions
Coin class	-Creating a simple class -Creating objects -Note: Used in Lesson 11.39	Solutions
Rectangle class 1	-Code analysis, -Instance variables -Instance methods	Solutions
Rectangle class 2	-Constructors -Constructor overloading -Constructor chaining	Solutions
House class	-Instance variables -Instance methods -Constructors -Using OOP and NOOPDraw -Note: Used in Lesson 12.11	Solutions
Prism class	-Constructors and Instance methods -Note: Used in Lesson 12.12D (Review)	Solutions
Pen class	-Class Design -Note: Used in Lesson 12.12D (Review)	Solutions
Weapon & Warrior classes (incomplete)	-Instance variables -Constructors -Instance methods -Aggregation -Note: Formerly used in Lesson 12.1	Solutions
Rectangle class 3	-Intro to Encapsulation -Note: Used in Lesson 11.40	Solutions
Lamp class	-Intro to Encapsulation -Note: Used in Lesson 11.40	Solutions
Name class	-Encapsulation -Immutable class -Class diagrams -Note: Used in Lesson 12.12A	Solutions
LateSlip class	-Encapsulation -Note: Used in Lesson 12.12A	Solutions
Point classes	-Immutable classes -Code analysis	Solutions
Weapon class	-Implementing instance methods -Code analysis -Encapsulation -Using this -Note: Used in Lesson 11.40	Solutions
Spaceship class	-Encapsulation -toString() -Used in Lesson 11.43T	Solutions
Date class	-Advanced class creation -Instance methods -Encapsulation	Solutions
Date class 2 (incomplete)	-Advanced class creation -Instance methods -Encapsulation	Solutions
Bottle class	-Advanced class creation -Encapsulation -Advanced method design -Note: Used in Lesson 12.12B	Solutions
Bottle class 2	-Object arrays -Note: Used in Lesson 12.12B	Solutions
Bottle class 3	-Object arrays -Code analysis -Note: Used in Lesson 12.12B	Solutions
Room class 1	-Encapsulation -Note: Used in Lesson 12.12B	Solutions
Room class 2	-Object arrays -Note: Used in Lesson 12.12B	Solutions
House class 2	-Object arrays -Processing object arrays -Using OOP and NOOPDraw -Note: Used in Lesson 12.12B	Solutions
Hand class	-Aggregation (no encapsulation) -Note: Used in Lesson 11.41	Solutions
Line class	-Aggregation (no encapsulation) -Note: Used in Lesson 11.41	Solutions
Line class 2	-Aggregation -Encapsulation -toString() -Note: Used in Lesson 11.41	Solutions
Point class 2	-Implementing instance methods -Calling instance methods -Processing object arrays -Note: Used in Lesson 12.12D (Review)	Solutions
Employee class	-Aggregation -Using multiple classes -Note: Used in Lesson 12.12C	Solutions
Case class	-Aggregation -Object array as instance variable -Encapsulation -Note: Used in Lesson 12.12C	Solutions
Grid class	-Object arrays -Aggregation -Using NOOPDraw -Note: Used in Game of Life project	Solutions
Grid class 2	-Object arrays -Aggregation -Animation with NOOPDraw -Note: Used in Game of Life project	Solutions

IDEAS TO CONSIDER ADDING

+++++

In Dog class, or as Dog class 2, add a rollover and an age check. If too old, then dog doesn’t roll over. This would show more use of instance variables.

Similarly, perhaps a young dog barks a lot while an older dog might bark once, or growl or not do anything.

+++++

Simple intro class similar to Dog

public class HardDrive

{

public void writeData()

{

System.out.println(“data is being written”);

}

public void readData()

{

System.out.println(“data is being read from hard drive”);

}

}

public class Computer

{

public static void main(String[]args)

{

HardDisk segate= new HardDisk();

segate.writedata();

}

}

+++++

Object array idea.

Students get a Point class and a Line class as starter code.

Students are also given code to create a Point array.

Students are to write a function that will get a point array and create a Line array where the lines are the lines between each point including the line from the last point to the first point.

Can also write a function that will translate all points in an array.

+++++

Pass by reference for objects

Pass by reference for datafields (Security risk when datafields are references.)

+++++

Array as a datafield. (String chooser problem from AP 2016 test?) (Or, a Sequence class that holds an array with a sequence. It has a getNext() method and perhaps a hasNext() method. And a getAt() method. Also a getPrev() and hasPrev(). And just a getCurrent() method.

+++++

Point class with Point() constructor that generates points within a certain distance of origin. Create many and draw them using NOOPDraw. Then include a translate method that moves points to a more central location on the screen to make out the shape of the circle.

+++++

Possibly do a turtle graphics application using NOOPDraw?

+++++

Possible idea

Couple which needs two Persons. Couple can haveChild() which returns a new Person. We can put all Persons in a family maybe? Arraylist?