util/Random/DistinctSeeds.java

/**
 * @test 1.1 03/11/06
 * @bug 4949279
 * @summary Independent instantiations of Random() have distinct seeds.
 */

import java.util.Random;

public class DistinctSeeds {
    public static void main(String[] args) throws Exception {
        // Strictly speaking, it is possible for these to be equal,
        // but the likelihood should be *extremely* small.
        if (new Random().nextLong() == new Random().nextLong())
            throw new RuntimeException("Random seeds not unique.");
    }
}
Revision:	1.1
Committed:	Fri Nov 7 01:35:36 2003 UTC (20 years, 6 months ago) by jsr166
Branch:	MAIN
Log Message:	4949279: no-arg Random constructor should use nanoTime for seed.
#	Content
1	/**
2	* @test 1.1 03/11/06
3	* @bug 4949279
4	* @summary Independent instantiations of Random() have distinct seeds.
5	*/
6
7	import java.util.Random;
8
9	public class DistinctSeeds {
10	public static void main(String[] args) throws Exception {
11	// Strictly speaking, it is possible for these to be equal,
12	// but the likelihood should be extremely small.
13	if (new Random().nextLong() == new Random().nextLong())
14	throw new RuntimeException("Random seeds not unique.");
15	}
16	}