Java Utililty Methods Byte Array Create

if (data == null)
    throw new NullPointerException("Data cannot be null.");
if (finalSize < 0)
    throw new IllegalArgumentException("Final size must be equal or greater than 0.");
if (finalSize == 0)
    return new byte[0];
byte[] filledArray = new byte[finalSize];
int diff = finalSize - data.length;
...

return new byte[len];

byte[] data = new byte[size];
for (int ii = 0; ii < data.length; ii++)
    data[ii] = (byte) (ii % 256);
return data;

byte[] result = new byte[bytes.length];
int ind = 0;
for (int i : bytes) {
    result[ind++] = (byte) i;
return result;

byte[] result = new byte[bytes.length];
for (int i = 0; i < bytes.length; i++) {
    if (bytes[i] > 255 || bytes[i] < 0) {
        throw new IllegalArgumentException("all values must be 0 <= value < 256");
    result[i] = (byte) bytes[i];
return result;
...

if (bytes.length != 2)
    return 0;
return (byte) Long.parseLong(bytesToString(bytes, le, true), 16);

return toByteArr(Float.floatToIntBits(value), false);

byte[] result = new byte[array.length];
for (int i = 0; i < array.length; i++) {
    result[i] = array[i] ? (byte) 1 : (byte) 0;
return result;

byte[] dst = new byte[(int) Math.ceil((double) bits.length / 8)];
for (int i = 0; i < bits.length; i++) {
    dst[i / 8] |= (byte) ((bits[i] ? 1 : 0) << (i % 8));
return dst;

byte[] ret = new byte[length];
byte num = arg;
for (int i = length - 1; i >= 0; i--) {
    ret[i] = (byte) (num & 0xFF);
    num >>= 8;
return ret;