CODEWITHSUNDEEP
javaarrayslong-integer
Rajat Gupta
Rajat Gupta

Reputation: 26597

Converting 2 longs to corresponding byte[], and combining with a delimeter in between

I need to convert 2 longs to corresponding byte[], and then combine them with a delimeter in between. What is the most performant way to do this ? (I need to store resultant byte[] in the database.)

         like I have-
         long a=5324565343L  
         long b=423456L

then I want the byte[] representation of :- 

         5324565343-423456

EDIT: Couldnt understand what was actually unclear but still for clarification, I intially have 2 long(s) & I just want a byte[] of their concatenated form.

Upvotes: 0

Views: 130

Answers (3)

Stephen C
Stephen C

Reputation: 718906

I need to place it with a really high performance code in my application.

No you don't.

Consider this:

  • The time you will save by avoiding the creation of Strings is likely to be less than a microsecond.

  • The time taken to perform an SQL insert over a JDBC connection is likely to be measured in milliseconds.

In other words optimizing this particular operation is likely to have negligible effect on the overall performance of your application.

Upvotes: 1

ilalex
ilalex

Reputation: 3078

Use ByteBuffer from java.nio.ByteBuffer:

    long a = 5324565343L;
    long b = 423456L;
    byte[] bytes = new byte[18];
    ByteBuffer buffer = ByteBuffer.wrap(bytes);
    buffer.putLong(a);
    buffer.putChar('-');
    buffer.putLong(b);

Upvotes: 2

jzd
jzd

Reputation: 23629

Concantenate them and call getBytes() on the resulting String.

Something like:

(a + "-" + b).getBytes();

Upvotes: 1

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