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root/jsr166/jsr166/src/main/java/util/Random.java

Comparing jsr166/src/main/java/util/Random.java (file contents):
Revision 1.21 by jsr166, Sun May 18 23:47:56 2008 UTC vs.
Revision 1.25 by jsr166, Wed Aug 5 01:34:23 2009 UTC

#	Line 1 | Line 1
1		/*
2	<	* Copyright 1995-2007 Sun Microsystems, Inc.  All Rights Reserved.
2	>	* Copyright 1995-2008 Sun Microsystems, Inc.  All Rights Reserved.
3		* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4		*
5		* This code is free software; you can redistribute it and/or modify it
#	Line 32 | Line 32 | import sun.misc.Unsafe;
32		* An instance of this class is used to generate a stream of
33		* pseudorandom numbers. The class uses a 48-bit seed, which is
34		* modified using a linear congruential formula. (See Donald Knuth,
35	<	* <i>The Art of Computer Programming, Volume 3</i>, Section 3.2.1.)
35	>	* <i>The Art of Computer Programming, Volume 2</i>, Section 3.2.1.)
36		* <p>
37		* If two instances of {@code Random} are created with the same
38		* seed, and the same sequence of method calls is made for each, they
#	Line 50 | Line 50 | import sun.misc.Unsafe;
50		* <p>
51		* Many applications will find the method {@link Math#random} simpler to use.
52		*
53	+	* <p>Instances of {@code java.util.Random} are threadsafe.
54	+	* However, the concurrent use of the same {@code java.util.Random}
55	+	* instance across threads may encounter contention and consequent
56	+	* poor performance. Consider instead using
57	+	* {@link java.util.concurrent.ThreadLocalRandom} in multithreaded
58	+	* designs.
59	+	*
60	+	* <p>Instances of {@code java.util.Random} are not cryptographically
61	+	* secure.  Consider instead using {@link java.security.SecureRandom} to
62	+	* get a cryptographically secure pseudo-random number generator for use
63	+	* by security-sensitive applications.
64	+	*
65		* @author  Frank Yellin
54	–	* @version %I%, %G%
66		* @since   1.0
67		*/
68		public
#	Line 505 | Line 516 | class Random implements java.io.Serializ
516
517		// The seed is read in as {@code long} for
518		// historical reasons, but it is converted to an AtomicLong.
519	<	long seedVal = (long) fields.get("seed", -1L);
519	>	long seedVal = fields.get("seed", -1L);
520		if (seedVal < 0)
521		throw new java.io.StreamCorruptedException(
522		"Random: invalid seed");

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