test/java/lang/Long/BitTwiddle.java

rev 11823 : 8078672: Print and allow setting by Java property seeds used to initialize Random instances in java.lang numerics tests
Summary: Add ability to initial the random number generator from the system property "seed" and print to STDOUT the seed value actually used.
Reviewed-by: XXX

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -21,12 +21,15 @@
  * questions.
  */
 
 /*
  * @test
- * @bug     4495754
- * @summary Basic test for long bit twiddling
+ * @library /lib/testlibrary/
+ * @build jdk.testlibrary.*
+ * @run main BitTwiddle
+ * @bug     4495754 8078672
+ * @summary Basic test for long bit twiddling (use -Dseed=X to set PRNG seed)
  * @author  Josh Bloch
  * @key randomness
  */
 
 import java.util.Random;

@@ -34,11 +37,11 @@
 
 public class BitTwiddle {
     private static final int N = 1000; // # of repetitions per test
 
     public static void main(String args[]) {
-        Random rnd = new Random();
+        Random rnd = RandomFactory.getRandom();
 
         if (highestOneBit(0) != 0)
             throw new RuntimeException("a");
         if (highestOneBit(-1) != MIN_VALUE)
             throw new RuntimeException("b");