Java - NullPointerException after initializing array and when testing array with class method

Question

I\'ve been trying to initialize an array and then test its values with a class method. I have initialized the array and have already tested it successfully within the constr

Answer 1

In the constructor you initialize an array boolean[]. The array is only visible in the constructor. If you want to use the array of the class, then replace

boolean[] grid = new boolean[sides];

with

grid = new boolean[sides];

. Then you use the array of the class, not of the constructor.