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1 /* |
1 /* |
2 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. |
2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * |
4 * |
5 * This code is free software; you can redistribute it and/or modify it |
5 * This code is free software; you can redistribute it and/or modify it |
6 * under the terms of the GNU General Public License version 2 only, as |
6 * under the terms of the GNU General Public License version 2 only, as |
7 * published by the Free Software Foundation. |
7 * published by the Free Software Foundation. |
21 * questions. |
21 * questions. |
22 */ |
22 */ |
23 |
23 |
24 /* |
24 /* |
25 * @test |
25 * @test |
26 * @bug 4495754 |
26 * @library /lib/testlibrary/ |
27 * @summary Basic test for int bit twiddling |
27 * @build jdk.testlibrary.* |
|
28 * @run main BitTwiddle |
|
29 * @bug 4495754 8078672 |
|
30 * @summary Basic test for int bit twiddling (use -Dseed=X to set PRNG seed) |
28 * @author Josh Bloch |
31 * @author Josh Bloch |
29 * @key randomness |
32 * @key randomness |
30 */ |
33 */ |
31 |
34 |
32 import java.util.Random; |
35 import java.util.Random; |
34 |
37 |
35 public class BitTwiddle { |
38 public class BitTwiddle { |
36 private static final int N = 1000; // # of repetitions per test |
39 private static final int N = 1000; // # of repetitions per test |
37 |
40 |
38 public static void main(String args[]) { |
41 public static void main(String args[]) { |
39 Random rnd = new Random(); |
42 Random rnd = RandomFactory.getRandom(); |
40 |
43 |
41 if (highestOneBit(0) != 0) |
44 if (highestOneBit(0) != 0) |
42 throw new RuntimeException("a"); |
45 throw new RuntimeException("a"); |
43 if (highestOneBit(-1) != MIN_VALUE) |
46 if (highestOneBit(-1) != MIN_VALUE) |
44 throw new RuntimeException("b"); |
47 throw new RuntimeException("b"); |