diff options
Diffstat (limited to 'src/share/classes/java/lang/Math.java')
| -rw-r--r-- | src/share/classes/java/lang/Math.java | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/src/share/classes/java/lang/Math.java b/src/share/classes/java/lang/Math.java index 7ce31265d..455a21f9a 100644 --- a/src/share/classes/java/lang/Math.java +++ b/src/share/classes/java/lang/Math.java @@ -681,9 +681,9 @@ public final class Math { private static Random randomNumberGenerator; - private static synchronized void initRNG() { - if (randomNumberGenerator == null) - randomNumberGenerator = new Random(); + private static synchronized Random initRNG() { + Random rnd = randomNumberGenerator; + return (rnd == null) ? (randomNumberGenerator = new Random()) : rnd; } /** @@ -694,9 +694,11 @@ public final class Math { * * <p>When this method is first called, it creates a single new * pseudorandom-number generator, exactly as if by the expression - * <blockquote>{@code new java.util.Random}</blockquote> This - * new pseudorandom-number generator is used thereafter for all - * calls to this method and is used nowhere else. + * + * <blockquote>{@code new java.util.Random()}</blockquote> + * + * This new pseudorandom-number generator is used thereafter for + * all calls to this method and is used nowhere else. * * <p>This method is properly synchronized to allow correct use by * more than one thread. However, if many threads need to generate @@ -705,11 +707,12 @@ public final class Math { * * @return a pseudorandom {@code double} greater than or equal * to {@code 0.0} and less than {@code 1.0}. - * @see java.util.Random#nextDouble() + * @see Random#nextDouble() */ public static double random() { - if (randomNumberGenerator == null) initRNG(); - return randomNumberGenerator.nextDouble(); + Random rnd = randomNumberGenerator; + if (rnd == null) rnd = initRNG(); + return rnd.nextDouble(); } /** |