RFR: 8279598: Provide adapter from RandomGenerator to Random [v6]

[liach]

On Sun, 20 Feb 2022 03:15:22 GMT, Yasser Bazzi <duke at openjdk.java.net> wrote:

>> Hi, could i get a review on this implementation proposed by Stuart Marks, i decided to use the https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/random/RandomGenerator.html interface to create the default method `asRandom()` that wraps around the newer algorithms to be used on classes that do not accept the new interface.
>> 
>> Some things to note as proposed by the bug report, the protected method next(int bits) is not overrided and setSeed() method if left blank up to discussion on what to do with it.
>> 
>> Small test done on https://gist.github.com/YShow/da678561419cda8e32fccf3a27a649d4
>
> Yasser Bazzi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove missed whitespace

src/java.base/share/classes/java/util/Random.java line 95:

> 93:     private static class RandomWrapper extends Random implements RandomGenerator {
> 94:         private final RandomGenerator generator;
> 95:         private final boolean initialized;

Can we create a private or package-private constructor for `Random` for this subclass' constructor to call? The no-arg constructor has some unnecessary calculations, and the `long` constructor calls `setSeed`. A special `Random` constructor for this subclass allows removing this special logic (by not calling `setSeed` at all) and avoid redundant seed initialization.

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PR: https://git.openjdk.java.net/jdk/pull/7001