Hidden features of Groovy?

Answer 1

Closure-Based Interface Implementation

If you have a typed reference such as:

MyInterface foo

You can implement the entire interface using:

foo = {Object[] args -> println "This closure will be called by ALL methods"} as MyInterface

Alternatively, if you want to implement each method separately, you can use:

foo = [bar: {-> println "bar invoked"}, 
    baz: {param1 -> println "baz invoked with param $param1"}] as MyInterface