Java vs Groovy

Some notable difference between java and groovy way of implementing the solution is as mentioned below -

1. Implementing immutable objects
2. Implementing singleton objects
3. Concise code with groovy 
4. String Vs GString
5. Groovy Design patterns
6. Closure 
7. Extending groovy with use directive
8. Groovy auto creation of  getters and setters
9. Unit testing in groovy
10. Adding new functionality to class at compile time or run-time using mixin