How to write programs with arrays?

Question

Java

Specify an integer array consisting of elements 0 and 1. For example: [ 1, 1, 0, 0, 1, 0, 1, 1, 0, 0 ]. With the help of a loop and a condition, replace 0 with 1, 1 with 0;

public class Main {

    public static void main(String[] args) {
  int[] arr1 = new int[] {1, 1, 0, 0, 1, 0, 1, 1, 0, 0};
    for (int i = 0; i < arr1.length; i++) {
        if (arr1[i] == 1) {
        }
    }
}
}

So I started, but I don’t know how.

Answer 1

what don't you like
arr1[i] ^= 1;
?

Answer 2

if(arr1[i] == 1) {
arr1[i] = 0
} else {
arr1[i] =1
}
UPD even better

Answer 3

and it is possible without the condition
arr1[i]=(arr[i]+1)%2