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root/jsr166/jsr166/src/test/jtreg/util/Random/DistinctSeeds.java

Comparing jsr166/src/test/jtreg/util/Random/DistinctSeeds.java (file contents):
Revision 1.3 by dl, Mon Feb 19 00:24:17 2007 UTC vs.
Revision 1.7 by jsr166, Tue Mar 15 19:47:04 2011 UTC

#	Line 1 | Line 1
1	–	/**
2	–	* @test %I% %E%
3	–	* @bug 4949279
4	–	* @summary Independent instantiations of Random() have distinct seeds.
5	–	*/
6	–
1		/*
2		* Written by Doug Lea with assistance from members of JCP JSR-166
3		* Expert Group and released to the public domain, as explained at
4	<	* http://creativecommons.org/licenses/publicdomain
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5		*/
6
7	+	/*
8	+	* @test
9	+	* @bug 4949279
10	+	* @summary Independent instantiations of Random() have distinct seeds.
11	+	*/
12
13		import java.util.Random;
14
15		public class DistinctSeeds {
16		public static void main(String[] args) throws Exception {
17	<	// Strictly speaking, it is possible for these to randomly fail,
18	<	// but the probability should be *extremely* small (< 2**-63).
19	<	if (new Random().nextLong() == new Random().nextLong() ||
20	<	new Random().nextLong() == new Random().nextLong())
17	>	// Strictly speaking, it is possible for these to randomly fail,
18	>	// but the probability should be *extremely* small (< 2**-63).
19	>	if (new Random().nextLong() == new Random().nextLong() ||
20	>	new Random().nextLong() == new Random().nextLong())
21		throw new RuntimeException("Random() seeds not unique.");
22		}
23		}

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