[jira] [Commented] (RNG-161) 是否可以动态设置seed？

["Alex Herbert (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/RNG-161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17398510#comment-17398510 ] 

Alex Herbert commented on RNG-161:
----------------------------------

You can create a random generator (RNG) with any supported seed (int, long, byte[], int[], long[]) using:
{code:java}
long seed = 123;
UniformRandomProvider rng = RandomSource.create(RandomSource.KISS, seed);
{code}
 
 The API does not allow reseeding an existing RNG. If you wish some part of your random operations to be reproducible you have two options:
 # Create a new RNG with the same seed as previously
 # Restore the state to a previously saved state

The second option is as follows:
{code:java}
long seed = 123;
RestorableUniformRandomProvider rng = RandomSource.create(RandomSource.KISS, seed);

RandomProviderState state = rng.saveState();

for (int i = 0; i < 10; i++) {
    rng.nextLong();
}

// Reset
rng.restoreState(state);
{code}

Note that the state is not guaranteed to be transferable across versions. This is not intended to be used to serialise a generator upon shutdown and then restore at next start-up. The state should only be used within the same instance of the JVM.


> 是否可以动态设置seed？
> -------------
>
>                 Key: RNG-161
>                 URL: https://issues.apache.org/jira/browse/RNG-161
>             Project: Commons RNG
>          Issue Type: Improvement
>          Components: client-api
>    Affects Versions: 1.3
>            Reporter: sun
>            Priority: Major
>
> Does Commons RNG can set the seed by method,isn't use RandomSource.create，like random.setSeed() to set the seed ?



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