Question

I have a 2d Boolean array and I want to dynamically create it’s size based on the input coming in.
For example: I have this string as the input “0-1 0-2 1-2 1-3 2-3”. I split it on the dash and parsed it to an int. All those coordinates are positions in the Boolean array. When I initialize the array below for this example it works. But how could I initialize it dynamically in case the input changes?

myArray = new boolean [4][4];

Answer 1

If you must use a fixed-size array, you could find the max values for each coordinate separately, and use these values for the initialization:

int maxR = 0, maxC = 0;
for (String pair : pairs) {
    int r = ... // first part of the split
    int c = ... // second part of the split
    maxR = Math.max(maxR, r);
    maxC = Math.max(maxC, c);
}
boolean[][] myArray = new boolean[maxR][maxC];