Here is the list of few Java converting tutorials: Java BigDecimal floatValue method example Java bigdecimal valueOf long example Java bigdecimal shortValue example

See the example below that explains How to convert java BigDecimal to normal byte array not 2 s complement :

BigDecimal test = new BigDecimal(35116031);
BigInteger theInt = test.unscaledValue();
byte[] arr = theInt.toByteArray();
System.out.println(Arrays.toString(arr));

BigInteger bi2 = new BigInteger(arr);
BigDecimal bd2 = new BigDecimal(bi2, 0);
System.out.println(bd2);

it will print the following output.

[2, 23, -45, -1]