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 ****
  /*
!  * Copyright (c) 2003, 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.
--- 1,7 ----
  /*
!  * 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.
*** 21,32 ****
   * questions.
   */
  
  /*
   * @test
!  * @bug     4495754
!  * @summary Basic test for long bit twiddling
   * @author  Josh Bloch
   * @key randomness
   */
  
  import java.util.Random;
--- 21,35 ----
   * questions.
   */
  
  /*
   * @test
!  * @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;
*** 34,44 ****
  
  public class BitTwiddle {
      private static final int N = 1000; // # of repetitions per test
  
      public static void main(String args[]) {
!         Random rnd = new Random();
  
          if (highestOneBit(0) != 0)
              throw new RuntimeException("a");
          if (highestOneBit(-1) != MIN_VALUE)
              throw new RuntimeException("b");
--- 37,47 ----
  
  public class BitTwiddle {
      private static final int N = 1000; // # of repetitions per test
  
      public static void main(String args[]) {
!         Random rnd = RandomFactory.getRandom();
  
          if (highestOneBit(0) != 0)
              throw new RuntimeException("a");
          if (highestOneBit(-1) != MIN_VALUE)
              throw new RuntimeException("b");