All is fixed!
Except suggestion to check for zeros in random tests, because if we create array with 100 elements, one of them would have zero. I wrote test to prove it, it imitates creation of 1 million arrays with 100 elements and all of them contain zero, please take a look:
@Test
void testZeros() throws Exception {
Random random = new Random();
for (int i = 0; i < 1_000_000; i++) {
boolean containsZero = false;
//imitates creation of array with 100 elements
for (int j = 0; j < 100; j++) {
if((random.nextInt(100_000) + "").contains("0")) {
containsZero = true;
}
}
if(!containsZero) {
System.out.println("there is no zero in " + i + "array");
throw new Exception();
}
}
System.out.println("All arrays contains zero");
}

Please approve Java translation https://www.codewars.com/kumite/623e370c1c0bbd000e2bbab1?sel=623e370c1c0bbd000e2bbab1

any tips? I have left only this kata left on level 7 in java, need help! I understand that flag encoded in FLAG variable somehow with number 16, I tried to get every 16 letter, I tried to use online auto decoders, please help!

Great kata, thank you!

Thanks, you helped me to understand this task