Standard Java library for converting endianness of primitive types + uuid

Question

I would like to ask if there is already a standard Java library that implements the following two things:

1. converting between endlessness standard Java primitive types + UUID.
2. lossless conversion between signed and unsigned standard Java primitive types. By lossless I mean for example that converting from signed short to unsigned short then the result could be signed Integer.

If such exists then what is the name of that library.

Answer 1

You could use the ByteSwapper from here: http://www.java2s.com/Code/Java/Language-Basics/Utilityforbyteswappingofalljavadatatypes.htm.

Or alternatively, use the ByteBuffer and specify the endianness with order(), as explained here: https://stackoverflow.com/a/14827440/1067124 (copied below)

With java.nio.ByteBuffer you may specify the endianness you want: order().

ByteBuffer have methods to extract data as byte, char, getShort(), getInt(), long, double...

Here's an example how to use it:

ByteBuffer bb = ByteBuffer.wrap(byteArray);
bb.order( ByteOrder.LITTLE_ENDIAN);
while( bb.hasRemaining()) {
   short v = bb.getShort();
   /* Do something with v... */
}