1. Groovy vs Java
NOV 2011

2. The real battle is static vs dynamic
typing
In other words:
● Static :
The type of each variable (or expression) must be known
at compile time.
● Dynamic:
Type information is known only at runtime.

3. Which are their super powers ?
● Static Typing
–Errors are often detected earlier and with better error messages
–Better IDE support
–Better optimisations are often possible
● Dynamic Typing
–Speeds up development through duck-typing
–Allows more expressiveness through DSLs

4. We choose the dynamic way
Many of the rules and patterns we have been taught no longer
apply
1. Patterns to review
○ Singleton
○ Resources
○ Delegation
○ ...
2. Performace
○ Java always wins ?
○ We need win ?

5. DEMOS
What are you doing?
Let's go to see CODE !!!
https://github.com/pablomoretti/ppt-groovy-vs-java

6. Lessons
● Testing the Duck:
Used when flexibility is important, but it has appropriate tests in place.
● Static Typing isn't the bad guy of the movie:
Used when we know that code doesn´t need to be dynamic; typing
is useful to shed some light on code.
● Interface-oriented design:
The use of interfaces is not necessary, but they are useful.
● Performance:
In Groovy, the sensitive parts can always be written in Java

7. Questions ?
@elsantob