1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* Copyright 2009 Google, Inc. 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.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4245470 7088913
* @summary Test the primitive wrappers hashCode()
*/
import java.util.Objects;
import java.util.Random;
public class HashCode {
final Random rnd = new Random();
void testOrdinals(String args[]) throws Exception {
long[] longs = {
Long.MIN_VALUE,
Integer.MIN_VALUE,
Short.MIN_VALUE,
Character.MIN_VALUE,
Byte.MIN_VALUE,
-1, 0, 1,
Byte.MAX_VALUE,
Character.MAX_VALUE,
Short.MAX_VALUE,
Integer.MAX_VALUE,
Long.MAX_VALUE,
rnd.nextInt(),
};
for (long x : longs) {
check( new Long(x).hashCode() == (int)((long)x ^ (long)x>>>32));
check(Long.valueOf(x).hashCode() == (int)((long)x ^ (long)x>>>32));
check( (new Long(x)).hashCode() == Long.hashCode(x));
check( new Integer((int)x).hashCode() == (int) x);
check(Integer.valueOf((int)x).hashCode() == (int) x);
check( (new Integer((int)x)).hashCode() == Integer.hashCode((int)x));
check( new Short((short)x).hashCode() == (short) x);
check(Short.valueOf((short)x).hashCode() == (short) x);
check( (new Short((short)x)).hashCode() == Short.hashCode((short)x));
check( new Character((char) x).hashCode() == (char) x);
check(Character.valueOf((char) x).hashCode() == (char) x);
check( (new Character((char)x)).hashCode() == Character.hashCode((char)x));
check( new Byte((byte) x).hashCode() == (byte) x);
check(Byte.valueOf((byte) x).hashCode() == (byte) x);
check( (new Byte((byte)x)).hashCode() == Byte.hashCode((byte)x));
}
}
void testBoolean() {
check( Boolean.FALSE.hashCode() == 1237);
check( Boolean.TRUE.hashCode() == 1231);
check( Boolean.valueOf(false).hashCode() == 1237);
check( Boolean.valueOf(true).hashCode() == 1231);
check( (new Boolean(false)).hashCode() == 1237);
check( (new Boolean(true)).hashCode() == 1231);
check( Boolean.hashCode(false) == 1237);
check( Boolean.hashCode(true) == 1231);
}
void testFloat() {
float[] floats = {
Float.NaN,
Float.NEGATIVE_INFINITY,
-1f,
0f,
1f,
Float.POSITIVE_INFINITY
};
for(float f : floats) {
check( Float.hashCode(f) == Float.floatToIntBits(f));
check( Float.valueOf(f).hashCode() == Float.floatToIntBits(f));
check( (new Float(f)).hashCode() == Float.floatToIntBits(f));
}
}
void testDouble() {
double[] doubles = {
Double.NaN,
Double.NEGATIVE_INFINITY,
-1f,
0f,
1f,
Double.POSITIVE_INFINITY
};
for(double d : doubles) {
long bits = Double.doubleToLongBits(d);
int bitsHash = (int)(bits^(bits>>>32));
check( Double.hashCode(d) == bitsHash);
check( Double.valueOf(d).hashCode() == bitsHash);
check( (new Double(d)).hashCode() == bitsHash);
}
}
//--------------------- Infrastructure ---------------------------
volatile int passed = 0, failed = 0;
void pass() {passed++;}
void fail() {failed++; Thread.dumpStack();}
void fail(String msg) {System.err.println(msg); fail();}
void unexpected(Throwable t) {failed++; t.printStackTrace();}
void check(boolean cond) {if (cond) pass(); else fail();}
void equal(Object x, Object y) {
if (Objects.equals(x,y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
new HashCode().instanceMain(args);}
public void instanceMain(String[] args) throws Throwable {
try { testOrdinals(args);
testBoolean();
testFloat();
testDouble();
} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}
|
