import java.math.BigInteger;
public class Main {
public static void main(String[] argv) throws Exception {
byte[] bytes = new byte[] { (byte) 0x12, (byte) 0x0F, (byte) 0xF0 };
// Create a BigInteger using the byte array
BigInteger bi = new BigInteger(bytes);
String s = bi.toString(2);
System.out.println(s);
}
}