Announcements

1
Announcements Review

• Last Time arrays of objects
• Items apples
• appleTypes 8
• apples new ItemsappleTypes
• apples0 new Items(Granny Smith", 22)

• Announcements
• Exam
• 2/28 530-730pm
• GEO 2.216
• Brief study guide on web (see detailed schedule)

2
Initializing Array of Objects

• Items apples new Items3
• apples -

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3
Initializing Array of Objects

• Items apples new Items3
• apples2 new Items(Granny Smith, 22)
• apples -

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4
Initializing Array of Objects

• Items apples new Items3
• apples2 new Items(Granny Smith, 22)
• apples0 apples2
• apples -

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5
Visualizing an Array of Objects

• ...
• apple0.setName("McIntosh)
• apple1.setAmount(10)
• apples -

6
Swapping Elements

• // lets swap apple0 and apple2
• Items tmp apple0 // Make a temporary copy.
  Why?
• apples -

tmp
7
Swapping Elements

• // lets swap apple0 and apple2
• Items tmp apple0 // Make a temporary copy.
  Why?
• apple0 apple2
• apples -

tmp
8
Swapping Elements

• // lets swap apple0 and apple2
• Items tmp apple0 // Make a temporary copy.
  Why?
• apple0 apple2
• apple2 tmp
• apples -

tmp
9
Swapping Integers

• // swap a b
• public void swap(int a, int b)
• int t a
• a b
• b t
• int a 10
• int b 20
• swap (a, b) // a 20 b 10

10
BlueJ Examples

• Problems
• Extend Inventory class for tracking Items

11
More Questions?