How do I convert a byte array with null terminating character to a String in Java?

by 
byte arr[] = ...
Charset charset = ...

// Find the position of the first zero byte
int i;
for (i = 0; i < arr.length && arr[i] != 0; i++) { }


String str = new String(arr, 0, i, charSet);

Notes:

  • It is generally a good idea to use an explicit CharSet parameter so that your application doesn’t depend on the platform’s default characterset / encoding.

  • This won’t work for some charsets. For instance, a UTF-16 encoded string can’t safely be represented as a zero-terminated byte sequence because many code units contain zero bytes. (On the other hand, UTF-8 is OK provided that the string contains no instances of code point zero; see Can UTF-8 contain zero byte?)

… but I was wondering whether the String constructor will do this automatically.

No it / they won’t. (Don’t “wonder” … read the javadoc :-))

I also assume the system’s default charset will be used on all ends.

If you don’t specify a charset, the Java platform’s default will be used. This is likely to be the system default, but that is not guaranteed.

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