1 /*
2 * Copyright (c) 2016, 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 8024500 8166446
27 * @run testng SingletonIterator
28 */
29
30 import java.util.Collections;
31 import java.util.Iterator;
32 import java.util.NoSuchElementException;
33 import java.util.concurrent.atomic.AtomicInteger;
34 import org.testng.annotations.Test;
35
36 import static org.testng.Assert.assertEquals;
37 import static org.testng.Assert.assertFalse;
38 import static org.testng.Assert.fail;
39
40 @Test(groups = "unit")
41 public class SingletonIterator {
42 static void assertIteratorExhausted(Iterator<?> it) {
43 assertFalse(it.hasNext());
44 try {
45 it.next();
46 fail("should have thrown NoSuchElementException");
47 } catch (NoSuchElementException success) { }
48 it.forEachRemaining(e -> { throw new AssertionError("action called incorrectly"); });
49 }
50
51 public void testForEachRemaining() {
52 Iterator<String> it = Collections.singleton("TheOne").iterator();
53 AtomicInteger cnt = new AtomicInteger(0);
54
55 it.forEachRemaining(s -> {
56 assertEquals("TheOne", s);
57 cnt.incrementAndGet();
58 });
59
60 assertEquals(cnt.get(), 1);
61 assertIteratorExhausted(it);
62 }
63
64 static class SingletonException extends RuntimeException { }
65
66 public void testThrowFromForEachRemaining() {
67 Iterator<String> it = Collections.singleton("TheOne").iterator();
68
69 try {
70 it.forEachRemaining(s -> { throw new SingletonException(); });
71 } catch (SingletonException ignore) { }
72
73 assertIteratorExhausted(it);
74 }
75 }
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1 /*
2 * Copyright (c) 2016, 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 8024500 8166446
27 * @library /test/lib
28 * @run testng SingletonIterator
29 */
30
31 import jdk.test.lib.valueclass.VClass;
32 import java.util.Collections;
33 import java.util.Iterator;
34 import java.util.NoSuchElementException;
35 import java.util.concurrent.atomic.AtomicInteger;
36 import org.testng.annotations.Test;
37
38 import static org.testng.Assert.assertEquals;
39 import static org.testng.Assert.assertFalse;
40 import static org.testng.Assert.fail;
41
42 @Test(groups = "unit")
43 public class SingletonIterator {
44 static void assertIteratorExhausted(Iterator<?> it) {
45 assertFalse(it.hasNext());
46 try {
47 it.next();
48 fail("should have thrown NoSuchElementException");
49 } catch (NoSuchElementException success) { }
50 it.forEachRemaining(e -> { throw new AssertionError("action called incorrectly"); });
51 }
52
53 public void testForEachRemaining() {
54 Iterator<String> it = Collections.singleton("TheOne").iterator();
55 AtomicInteger cnt = new AtomicInteger(0);
56
57 it.forEachRemaining(s -> {
58 assertEquals("TheOne", s);
59 cnt.incrementAndGet();
60 });
61
62 assertEquals(cnt.get(), 1);
63 assertIteratorExhausted(it);
64 }
65
66 static class SingletonException extends RuntimeException { }
67
68 @Test
69 public void testValueSingletonIterator() {
70 Iterator<VClass> it = Collections.singleton(new VClass(42, new int[] { 42 })).iterator();
71 AtomicInteger cnt = new AtomicInteger(0);
72 it.forEachRemaining(v -> {
73 if (!v.equals(new VClass(42, new int[] { 42 }))) throw new RuntimeException("wrong value");
74 cnt.incrementAndGet();
75 });
76 assertEquals(cnt.get(), 1);
77 assertIteratorExhausted(it);
78 }
79
80 public void testThrowFromForEachRemaining() {
81 Iterator<String> it = Collections.singleton("TheOne").iterator();
82
83 try {
84 it.forEachRemaining(s -> { throw new SingletonException(); });
85 } catch (SingletonException ignore) { }
86
87 assertIteratorExhausted(it);
88 }
89 }
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