Java – Why does byteArray have a length of 22 instead of 20

bytearrayencodingjavastring

We try to convert from string to Byte[] using the following Java code:

String source = "0123456789";
byte[] byteArray = source.getBytes("UTF-16");

We get a byte array of length 22 bytes, we are not sure where this padding comes from.
How do I get an array of length 20?

Best Answer

Alexander's answer explains why it's there, but not how to get rid of it. You simply need to specify the endianness you want in the encoding name:

String source = "0123456789";
byte[] byteArray = source.getBytes("UTF-16LE"); // Or UTF-16BE

Related Solutions

Python – Why is it string.join(list) instead of list.join(string)

It's because any iterable can be joined (e.g, list, tuple, dict, set), but its contents and the "joiner" must be strings.

For example:

'_'.join(['welcome', 'to', 'stack', 'overflow'])
'_'.join(('welcome', 'to', 'stack', 'overflow'))

'welcome_to_stack_overflow'

Using something other than strings will raise the following error:

TypeError: sequence item 0: expected str instance, int found

Python – Convert bytes to a string

You need to decode the bytes object to produce a string:

>>> b"abcde"
b'abcde'

# utf-8 is used here because it is a very common encoding, but you
# need to use the encoding your data is actually in.
>>> b"abcde".decode("utf-8") 
'abcde'

Best Answer

Related Solutions

Python – Why is it string.join(list) instead of list.join(string)

Python – Convert bytes to a string

Related Topic