CODEWITHSUNDEEP
javabytebuffer
Dean Hiller
Dean Hiller

Reputation: 20210

Go from ByteBuffer to String directly but with no intermediary byte[]?

Is there an approach that avoids having to copy byte[] from ByteBuffer with the ByteBuffer.get() operation.

I was looking at this post Java: Converting String to and from ByteBuffer and associated problems

and that causes an intermediary CharBuffer which I don't want as well.

I would like it to go from ByteBuffer to String.

When I know I have a byte[] underlying, this is easy with the code like so

new String(data, offset, length, charSet);

I was hoping for something similar with ByteBuffer. I am beginning to think this may not be possible? I need to decode N bytes of my ByteBuffer really.

This may be a bit of premature optimization but I am really just curious and wanted to test out the performance and squeeze every little bit out. (personal project really).

thanks, Dean

Upvotes: 0

Views: 460

Answers (1)

Kayaman
Kayaman

Reputation: 73568

Not really for a direct ByteBuffer, no. You need to have intermediate something, because String doesn't take a ByteBuffer as a constructor argument, and you can't wrap one (or even a char[]). If the buffer is non-direct, you can use the array() method to get a reference to the backing array (which isn't an intermediate array) and create a String out of that.

On the plus side, there's probably a lot more performance sensitive places in your project.

Upvotes: 2

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