Demonstrates some of the updates to the collection interfaces in Java 8, including sort(), removeIf(), forEach(), compute(), and replaceAll().

1. Java 8 Collections
Featuring Hack-n-Slash!

2. Java
Collection
Model

3. Java
Collection
Model

4. Hack-n-Slash!
• CaptainOpcode
• lambda_@rity
• Sir-Fragsalot
• general_f@1lur3
• deep_web9

5. Challenge #1: Sorting

6. Challenge #1: Sorting

7. Challenge #1: Sorting
Java 7
Java 8

8. Challenge #2: Removal

9. Challenge #2: Removal
Java 7

10. Challenge #2: Removal
Java 7

11. Challenge #2: Removal
Java 7
Java 8

12. Score Map
PLAYER NAME SCORE
CAPTAINOPCODE 2500
LAMBDA_@RITY 450
SIR-FRAGSALOT 1475
GENERAL_F@1LUR3 825
DEEP_WEB9 250

13. Score Map Output
CaptainOpcode has a score of 2500
lambda_@rity has a score of 450
Sir-Fragsalot has a score of 1475
general_f@1lur3 has a score of 825
deep_web9 has a score of 250

14. Challenge #3: Map Loop
Java 7
Java 8

15. Score Map
PLAYER NAME SCORE
CAPTAINOPCODE 2500
LAMBDA_@RITY 450
SIR-FRAGSALOT 1475
GENERAL_F@1LUR3 825
DEEP_WEB9 250
1650

16. Challenge #4: Compute
Java 7
Java 8
• Map.compute(key, remappingFunction)
• Map.computeIfAbsent(key, mappingFunction)
• Map.computeIfPresent(key, remappingFunction)
put
put
put

17. Score Map
PLAYER NAME SCORE
CAPTAINOPCODE 2500
LAMBDA_@RITY 450
SIR-FRAGSALOT 1475
GENERAL_F@1LUR3 1650
DEEP_WEB9 250
950
750

18. Challenge #5: Update
Java 7
Java 8

19. Honorable Mentions
• Map.getOrDefault(key, value)
• Map.putIfAbsent(key, value)
• Map.replace(key, value)
• Map.replace(key, value, value)
• Map.remove(key, value)

20. Thank You
@djleeds
+DaveLeeds
HittheBits.com
©2014 Dave Leeds. Code samples are licensed under the MIT License.