How to decode signed and unsigned 12 and 24-bit encoded integers from a byte array in Java

ByteArray2Int.java

// For unsigned integers, all byte array elements are decoded as unsigned using (value & 0xff) before the left shift (<<)
private static int byteArrayToUInt(byte[] input) {
    if (input.length == 3) { // 24-bit encoded
        // always decode them starting from right to left (2, 1, 0 indices in this example)
        return (input[0] & 0xFF) << 16 | (input[1] & 0xFF) << 8 | (input[2] & 0xFF); // lowercase F(f) also works
    } else if (input.length == 2) { // 12-bit encoded
        return (input[0] & 0xFF) << 8 | (input[1] & 0xFF);
    }
}

// For the signed integers, all the same, except that the right-most element is directly left shifted (<<) without unsigning
private static int byteArrayToSInt(byte[] input) {
    if (input.length == 3) { // 24-bit encoded
        return (input[0]) << 16 | (input[1] & 0xFF) << 8 | (input[2] & 0xFF);
    } else if (input.length == 2) { // 12-bit encoded
        return (input[0]) << 8 | (input[1] & 0xFF);
    }
}

// Extracted from:
// - https://stackoverflow.com/a/14856974
// - https://stackoverflow.com/a/5399829