Dynamically adding elements to ArrayList in Groovy
What you actually created with:
MyType[] list = []Was fixed size array (not list) with size of 0. You can create fixed size array of size for example 4 with:
MyType[] array = new MyType[4]But there's no add method of course.
If you create list with def it's something like creating this instance with Object (You can read more about def here). And [] creates empty ArrayList in this case.
So using def list = [] you can then append new items with add() method of ArrayList
list.add(new MyType())Or more groovy way with overloaded left shift operator:
list << new MyType()