replace Guava's Bytes and Longs

Question

I'd like to implement the following function without using Guava's Bytes and Longs.

Do you know any solution in "plain" Java [8], without dependencies?

import com.google.common.primitives.Bytes;
import com.google.common.primitives.Longs;

public static byte[] toBytesFromString(String uuid) {
    UUID id = UUID.fromString(uuid);
    final Long msb = id.getMostSignificantBits();
    final Long lsb = id.getLeastSignificantBits();
    return Bytes.concat(Longs.toByteArray(msb), Longs.toByteArray(lsb));
}

Thanks, Costin

You can copy the code from guava into your own method (assuming your project is Apache 2 compatible). Code is here for `Longs::toByteArray` for example: http://docs.guava-libraries.googlecode.com/git/javadoc/src-html/com/google/common/primitives/Longs.html#line.265 — assylias, Nov 24 '15 at 17:21

score 2 · Accepted Answer · answered Nov 24 '15 at 17:37

  public static byte[] toBytesFromString(String uuid) {
    UUID id = UUID.fromString(uuid);
    final Long msb = id.getMostSignificantBits();
    final Long lsb = id.getLeastSignificantBits();

    return ByteBuffer.allocate(2 * Long.BYTES).putLong(msb).putLong(lsb).array();

  }

replace Guava's Bytes and Longs

1 Answers1