Use instance 'private int' fields in your world class and add a 'public int getInteger_()' for each one so the actors can access the value of them with (using MyWorld as world class name):
You can change the underscores simulateously to whatever, for example 'A', 'B', 'C', ..., for each field. Actually, you can name they whatever you want, I just wanted to point out that all underscored names are referring to the same field.