57 |
|
* possible values. |
58 |
|
*/ |
59 |
|
public void testNext() throws ReflectiveOperationException { |
60 |
+ |
// Inhibit "An illegal reflective access operation has occurred" |
61 |
+ |
if (!testImplementationDetails) return; |
62 |
+ |
|
63 |
|
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
64 |
|
final java.lang.reflect.Method m; |
65 |
|
try { |
66 |
|
m = ThreadLocalRandom.class.getDeclaredMethod( |
67 |
|
"next", new Class[] { int.class }); |
68 |
|
m.setAccessible(true); |
69 |
< |
} catch (SecurityException |
70 |
< |
| java.lang.reflect.InaccessibleObjectException acceptable) { |
68 |
< |
// Either jdk9 module system or security manager might deny access. |
69 |
> |
} catch (SecurityException acceptable) { |
70 |
> |
// Security manager may deny access |
71 |
|
return; |
72 |
+ |
} catch (Exception ex) { |
73 |
+ |
// jdk9 module system may deny access |
74 |
+ |
if (ex.getClass().getSimpleName() |
75 |
+ |
.equals("InaccessibleObjectException")) |
76 |
+ |
return; |
77 |
+ |
throw ex; |
78 |
|
} |
79 |
|
|
80 |
|
int i; |
355 |
|
// Don't use main thread's ThreadLocalRandom - it is likely to |
356 |
|
// be polluted by previous tests. |
357 |
|
final AtomicReference<ThreadLocalRandom> threadLocalRandom = |
358 |
< |
new AtomicReference<ThreadLocalRandom>(); |
358 |
> |
new AtomicReference<>(); |
359 |
|
final AtomicLong rand = new AtomicLong(); |
360 |
|
|
361 |
|
long firstRand = 0; |
385 |
|
fail("all threads generate the same pseudo-random sequence"); |
386 |
|
} |
387 |
|
|
388 |
+ |
/** |
389 |
+ |
* Repeated calls to nextBytes produce at least values of different signs for every byte |
390 |
+ |
*/ |
391 |
+ |
public void testNextBytes() { |
392 |
+ |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
393 |
+ |
int n = rnd.nextInt(1, 20); |
394 |
+ |
byte[] bytes = new byte[n]; |
395 |
+ |
outer: |
396 |
+ |
for (int i = 0; i < n; i++) { |
397 |
+ |
for (int tries = NCALLS; tries-->0; ) { |
398 |
+ |
byte before = bytes[i]; |
399 |
+ |
rnd.nextBytes(bytes); |
400 |
+ |
byte after = bytes[i]; |
401 |
+ |
if (after * before < 0) |
402 |
+ |
continue outer; |
403 |
+ |
} |
404 |
+ |
fail("not enough variation in random bytes"); |
405 |
+ |
} |
406 |
+ |
} |
407 |
+ |
|
408 |
+ |
/** |
409 |
+ |
* Filling an empty array with random bytes succeeds without effect. |
410 |
+ |
*/ |
411 |
+ |
public void testNextBytes_emptyArray() { |
412 |
+ |
ThreadLocalRandom.current().nextBytes(new byte[0]); |
413 |
+ |
} |
414 |
+ |
|
415 |
+ |
public void testNextBytes_nullArray() { |
416 |
+ |
try { |
417 |
+ |
ThreadLocalRandom.current().nextBytes(null); |
418 |
+ |
shouldThrow(); |
419 |
+ |
} catch (NullPointerException success) {} |
420 |
+ |
} |
421 |
+ |
|
422 |
|
} |