You have to create a new array:
LifeWindow game = new LifeWindow(new int[100][100], 8);
Just for future reference, this is a pretty terrible API, using raw arrays like that.
A better choice would have been either a List<List<Integer>>
or even better aMap<Integer,List<Integer>>
.
An even better choice would have been a specific configuration class with named properties to let you know what they were actually being used for.