[11] RFR: 8170769 Provide a simple hexdump facility for binary data

Weijun Wang weijun.wang at oracle.com
Wed May 9 02:34:48 UTC 2018

Nice tool.

However, I am not sure how toFormattedHexString() and toPrintableString() are useful, seems only for providing a customizable dump format which is, actually, not very customizable.

For me, toHexString and fromHexString are of course the most useful methods. As for dump, I can only think of

1. The existing sun.security.HexDumpEncoder format, when I want to dump a lot of bytes as a block
2. "00:11:22:33:AA:BB:CC" which fits in one line and also easy to read, when I want inline debugging output

If the customizable dump method is both powerful and simple enough to create 2) above, I'll be happy. Otherwise, I can live with toHexString().replaceAll("(..)(?=.)", "$1:").


> On May 4, 2018, at 4:22 AM, Vincent Ryan <Vincent.X.Ryan at oracle.com> wrote:
> Hello,
> Please review this proposal for a new API to conveniently generate and display binary data using hex string representation.
> It supports both bulk and stream operations and it can also generate the well-known hexdump format [1].
> Thanks
> Bug: https://bugs.openjdk.java.net/browse/JDK-8170769
> API: http://cr.openjdk.java.net/~vinnie/8170769/javadoc.05/api/java.base/java/util/Hex.html
> Webrev: http://cr.openjdk.java.net/~vinnie/8170769/webrev.05/
> ____
> [1] https://docs.oracle.com/cd/E86824_01/html/E54763/hexdump-1.html

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