AES output has always 32byte length

Question

Hello
I have one question about decrypted data via AES. My code is following:
byte [] key = Hex.decode("000102030405060708090A0B0C0D0E0F");   
byte [] input = Hex.decode("000102030405060708090A0B0C0D0E0F");                               
byte [] output = null;
SecretKey secretKey = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES", "BC");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
output = cipher.doFinal(input);The input data have 16 byte length but I got always 32 byte large output. When I put only 15 byte input then I got 16 byte large output.
Can anyone explain me why I have 32 bytes instead of 16bytes, because input is exactly 16 byte and I expect same size.
Note,that first 16 bytes are equal as output in Crypto ++.
What is
Thanks
I'm simulating example from Crypto ++ in which output is always 16 byte by 16 byte large input.

Answer 1

By default you get PKCS5Padding so you will get 16 bytes of encrypted padding. Specify
Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding", "BC");