Question

Write a method with a void return value that inverts all the elements of a two-dimensional array of booleans (true becomes false and false becomes true).

Answer 1

void invert(boolean arr[][]) {
for (int i = 0; i < arr.length; i++) {
for (int j = 0; j < arr[i].length; j++) {
arr[i][j] = !arr[i][j];
}
}
}