Question

I have a boolean array

boolean[] test = {
    false,
    true,
    true,
    false,
    true
};

and I’m trying to flip (true to false, and false to true) the values with “for-each” statement like so:

for(boolean x : test) {
    x = !x;
}

But it’s only changing the x variable in the local scope.

I’m new to Java and I want to ask how this could be done and if this is the right approach. I’ve searched a lot, but most of the examples are used to collect data from the array without modifying it.

Answer 1

No, that’s not the right approach. The enhanced for loop doesn’t let you change the values of what you’re iterating over. To invert the array, you’d want to use a regular for loop:

for (int i = 0; i < test.length; i++) {
    test[i] = !test[i];
}

(Note that the enhanced for loop would let you make changes to the objects which any array elements referred to, if they were classes – but that’s not the same thing as changing the value of the element itself.)