1 /*
2 * Copyright (c) 2005, 2025, 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 * @bug 6267846 6275009
27 * @summary Test Collections.nCopies
28 * @author Martin Buchholz
29 */
30
31 import java.util.ArrayList;
32 import java.util.Collections;
33 import java.util.AbstractList;
34 import java.util.List;
35 import java.util.Objects;
36
37 public class NCopies {
38 static volatile int passed = 0, failed = 0;
39
40 static void fail(String msg) {
41 failed++;
42 new AssertionError(msg).printStackTrace();
43 }
44
45 static void pass() {
46 passed++;
47 }
48
49 static void unexpected(Throwable t) {
50 failed++;
125 List<String> nulls = Collections.nCopies(10, null);
126 List<String> nonNulls = Collections.nCopies(10, "non-null");
127 List<String> nullsButOne = new ArrayList<>(nulls);
128 nullsButOne.set(9, "non-null");
129 List<String> nonNullsButOne = new ArrayList<>(nonNulls);
130 nonNullsButOne.set(9, null);
131 check(!nulls.equals(nonNulls));
132 check(!nulls.equals(nullsButOne));
133 check(!nulls.equals(nonNullsButOne));
134 check(!nonNulls.equals(nonNullsButOne));
135 check(Collections.nCopies(0, null).equals(Collections.nCopies(0, "non-null")));
136 }
137
138 private static void checkReversed() {
139 List<String> copies = Collections.nCopies(10, "content");
140 check(copies.equals(copies.reversed()));
141 List<String> empty = Collections.nCopies(0, "content");
142 check(empty.equals(empty.reversed()));
143 }
144
145 public static void main(String[] args) {
146 try {
147 List<String> empty = Collections.nCopies(0, "foo");
148 checkEmpty(empty);
149 checkEmpty(empty.subList(0,0));
150
151 List<String> foos = Collections.nCopies(42, "foo");
152 check(foos.size() == 42);
153 checkFoos(foos.subList(foos.size()/2, foos.size()-1));
154
155 checkHashCode();
156
157 checkEquals();
158
159 checkReversed();
160
161 } catch (Throwable t) { unexpected(t); }
162
163 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
164 if (failed > 0) throw new Error("Some tests failed");
165 }
166 }
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1 /*
2 * Copyright (c) 2005, 2026, 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 * @bug 6267846 6275009
27 * @summary Test Collections.nCopies
28 * @author Martin Buchholz
29 * @library /test/lib
30 */
31
32 import jdk.test.lib.valueclass.VClass;
33 import java.util.ArrayList;
34 import java.util.Collections;
35 import java.util.AbstractList;
36 import java.util.List;
37 import java.util.Objects;
38
39 public class NCopies {
40 static volatile int passed = 0, failed = 0;
41
42 static void fail(String msg) {
43 failed++;
44 new AssertionError(msg).printStackTrace();
45 }
46
47 static void pass() {
48 passed++;
49 }
50
51 static void unexpected(Throwable t) {
52 failed++;
127 List<String> nulls = Collections.nCopies(10, null);
128 List<String> nonNulls = Collections.nCopies(10, "non-null");
129 List<String> nullsButOne = new ArrayList<>(nulls);
130 nullsButOne.set(9, "non-null");
131 List<String> nonNullsButOne = new ArrayList<>(nonNulls);
132 nonNullsButOne.set(9, null);
133 check(!nulls.equals(nonNulls));
134 check(!nulls.equals(nullsButOne));
135 check(!nulls.equals(nonNullsButOne));
136 check(!nonNulls.equals(nonNullsButOne));
137 check(Collections.nCopies(0, null).equals(Collections.nCopies(0, "non-null")));
138 }
139
140 private static void checkReversed() {
141 List<String> copies = Collections.nCopies(10, "content");
142 check(copies.equals(copies.reversed()));
143 List<String> empty = Collections.nCopies(0, "content");
144 check(empty.equals(empty.reversed()));
145 }
146
147 private static void checkValueCopies() {
148 List<VClass> copies = Collections.nCopies(10, new VClass(7, new int[] { 7 }));
149 check(copies.indexOf(new VClass(7, new int[] { 7 })) == 0);
150 check(copies.lastIndexOf(new VClass(7, new int[] { 7 })) == 9);
151 check(copies.equals(referenceNCopies(10, new VClass(7, new int[] { 7 }))));
152 check(copies.hashCode() == referenceNCopies(10, new VClass(7, new int[] { 7 })).hashCode());
153 check(copies.equals(copies.reversed()));
154 }
155
156 public static void main(String[] args) {
157 try {
158 List<String> empty = Collections.nCopies(0, "foo");
159 checkEmpty(empty);
160 checkEmpty(empty.subList(0,0));
161
162 List<String> foos = Collections.nCopies(42, "foo");
163 check(foos.size() == 42);
164 checkFoos(foos.subList(foos.size()/2, foos.size()-1));
165
166 checkHashCode();
167
168 checkEquals();
169
170 checkReversed();
171
172 checkValueCopies();
173
174 } catch (Throwable t) { unexpected(t); }
175
176 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
177 if (failed > 0) throw new Error("Some tests failed");
178 }
179 }
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