import java.util.BitSet;
public class Main {
public static void main(String[] argv) throws Exception {
System.out.println(fromByteArray(new byte[]{1,2,3}));
}
// Returns a bitset containing the values in bytes.
public static BitSet fromByteArray(byte[] bytes) {
BitSet bits = new BitSet();
for (int i = 0; i < bytes.length * 8; i++) {
if ((bytes[bytes.length - i / 8 - 1] & (1 << (i % 8))) > 0) {
bits.set(i);
}
}
return bits;
}
}
//{0, 1, 9, 16}