Your SlideShare is downloading. ×
0
Quick Intro to Java Collections
Quick Intro to Java Collections
Quick Intro to Java Collections
Quick Intro to Java Collections
Quick Intro to Java Collections
Quick Intro to Java Collections
Quick Intro to Java Collections
Quick Intro to Java Collections
Quick Intro to Java Collections
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Quick Intro to Java Collections

614

Published on

Published in: Technology, News & Politics
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
614
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
25
Comments
0
Likes
1
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  1. Quick  Intro  to  Java  Collec2ons   Jussi  Pohjolainen   Tampere  University  of  Applied  Sciences  
  2. Intro  •  Java  Collec2on  Framework  is  a  set  of  classes   and  interfaces  to  implement  data  structures  •  When  array  is  not  enough..  J  •  Lot  of  classes  and  interfaces   –  hFp://upload.wikimedia.org/wikipedia/ commons/4/41/Collec2on_Classes.jpg  
  3. Core  Collec2on  Interfaces  
  4. Collec2on  Interface  •  Basic  parts  of  all  collec2ons  •  add(),  remove(),  toArray(),  contains()  •  Collec2on  is  generic  
  5. Three  main  type  of  Collec2on  •  List   –  Always  ordered,  may  contain  duplicates,  like  an   array  •  Set   –  Cannot  contain  duplicate  •  Map     –  Key  –  value  pairs,  random  access  to  keys  
  6. List  •  List  interface  has  two  concrete  classes   –  ArrayList  –  implementa2on  uses  dynamically   resized  arrays   –  LinkedList  –  double-­‐linked  list  
  7. Set  •  Set  can’t  have  duplicates  •  Couple  concrete  classes   –  HashSet     –  TreeSet  –  sorted  elements!  
  8. Map  •  Key  value  pairs  •  Couple  concrete  classes     –  HashMap     –  TreeMap  -­‐  sorted  
  9. How  to  iterate?  •  Use  an  iterator!    Iterator i = someCollection.iterator();while(i.hasNext()) { System.out.println(i.next());}

×