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36069 (1) [Avatar] Offline
At page 203 it is written that Groovy code:

println 'Hello' // Groovy

is converted to bytecode equivalent to:

InvokerHelper.invokeMethod(this, "println", {"Hello"}) ; // Java

It looks to me that the curly brackets enclosing the "Hello" string is a typo.

Mittie (397) [Avatar] Offline

this is the literal declaration of an Object array (here String array) in Java.
You may want to try in your Java IDE:
String[] myarr = {"Groovy","in","Action"};

thanks for posting