How to Returns a byte array of at least length 1?

import java.util.BitSet;

public class Main {
public static void main(String[] argv) throws Exception {
BitSet bitset = new BitSet();
bitset.set(1);
System.out.println(toByteArray(bitset));
}

public static byte[] toByteArray(BitSet bits) {
byte[] bytes = new byte[bits.length() / 8 + 1];
for (int i = 0; i < bits.length(); i++) {
if (bits.get(i)) {
bytes[bytes.length - i / 8 - 1] |= 1 << (i % 8);
}
}
return bytes;
}
}