1 /*
2  * Copyright (c) 2001, 2005, Oracle and/or its affiliates. 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
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 /*
25  * @test
26  * @compile Constants.java
27  * @bug 4397405 4826652
28  * @summary Testing constant-ness of Double.{MIN_VALUE, MAX_VALUE}, etc.
29  * @author Joseph D. Darcy
30  */
31 
32 public class Constants {
33     /*
34      * This compile-only test is to make sure that the primitive
35      * public static final fields in java.lang.Double are "constant
36      * expressions" as defined by "The Java Language Specification,
37      * 2nd edition" section 15.28; a different test checks the values
38      * of those fields.
39      */
main(String[] args)40     public static void main(String[] args) throws Exception {
41         int i = 0;
42         switch (i) {
43         case (int)Double.NaN:                   // 0
44             System.out.println("Double.NaN is a constant!");
45             break;
46         case (int)Double.MIN_VALUE + 1:         // 0 + 1
47             System.out.println("Double.MIN_VALUE is a constant!");
48             break;
49         case (int)Double.MIN_NORMAL + 2:        // 0 + 2
50             System.out.println("Double.MIN_NORMAL is a constant!");
51             break;
52         case Double.MIN_EXPONENT:               // -1022
53             System.out.println("Double.MIN_EXPONENT is a constant!");
54             break;
55         case Double.MAX_EXPONENT:               // 1023
56             System.out.println("Double.MAX_EXPONENT is a constant!");
57             break;
58         case (int)Double.MAX_VALUE - 1:         // Integer.MAX_VALUE - 1
59             System.out.println("Double.MAX_VALUE is a constant!");
60             break;
61         case (int)Double.POSITIVE_INFINITY:     // Integer.MAX_VALUE
62             System.out.println("Double.POSITIVE_INFINITY is a constant!");
63             break;
64         case (int)Double.NEGATIVE_INFINITY:     // Integer.MIN_VALUE
65             System.out.println("Double.NEGATIVE_INFINITY is a constant!");
66             break;
67         }
68     }
69 }
70