Object Interaction

1
Object Interaction

• Notes Supplement
• CS 1054 Introduction to Programming in Java
• Spring 2008

2
Bank Example Revisited
1000
Bank
BankAccount john
BankAccount marsha
2000
3
Object Interaction
Bank
deposit( 200 )
BankAccount john
1000
deposit( john, 200 )
BankAccount marsha
2000
Calling deposit on the Bank object causes deposit
to be called on a BankAccount object
4
Array/ArrayList Version
Bank
BankAccount accounts
deposit( 200 )
deposit( 222, 200 )

Calling deposit on the Bank object causes deposit
to be called on a BankAccount object
5
Lab 9 ReportCardupdateGradeRecord( )
ReportCard
GradeRecord grades
updateGradeRecord( English, 85 )

changeGrade(85)
--- 85
Calling updateGradeRecord on the ReportCard
objectcauses changeGrade to be called on a
GradeRecord object
6
Lab 9 ReportCardgetAverage( )
getGrade()
ReportCard
GradeRecord grades
getGrade()
getAverage()

getGrade()
Calling getAverage on the ReportCard object
causesgetGrade to be called on each GradeRecord
object
7
Project 4 Grocery and Item
Grocery
Item items

100.00
cash