3. Develop Grails with Flex and deploy on Google App Engine or Spring Source Cloud

5. Let's play with Groovy

6. Some basic differences from Java

7. Some new operators

8. Anything in Java but not in Groovy

9. Expert Groovy

10. Best practices

12. Now Java bloats with too many frameworks, libs... -> many organizations have to consider Ruby, LAMP, .NET for more productive and agile at lower costs

13. Groovy appeared in 2003 – promising more complete and dynamic language for JVM instead of Ruby, Python, or JavaScript implementation for JVM.

15. Switch “Hello World” Java to Groovy

17. java.math

18. java.net

19. java.util

20. groovy.lang

21. groovy.util

23. Java: if (mySet == null || mySet.isEmpty()) {

24. ...

25. }

26. Groovy:

27. if (!mySet) {

28. ...

29. }

31. ?: (ELVIS!)

32. *. (THE SPREAD-DOT OPERATOR)

33. <=> (COMPARISONS WITH A SPACESHIP)

34. ${} (GROOVY STRINGS)

35. [] (ARRAY-STYLE NOTATION FOR LISTS AND MAPS)

37. No “DO...WHILE”

38. Inner and anonymous classes: Not fully supported

40. [ &quot;apple&quot;, &quot;pear&quot;, &quot;cherry&quot; ].each { println it }

41. Duck Typing : Applied to dynamic languages, it means that if an object has a particular property or method signature, then it doesn’t matter what type the object is, you can still call that method or access that property. This is only possible in dynamic languages because properties and methods are resolved at runtime.

43. Experiment

44. Use methods where appropriate

45. Use explicit types in method signatures