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 package test.java.util.Collections; 31 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 { assertIteratorExhausted(Iterator<?> it)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 testForEachRemaining()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 testThrowFromForEachRemaining()68 public void testThrowFromForEachRemaining() { 69 Iterator<String> it = Collections.singleton("TheOne").iterator(); 70 71 try { 72 it.forEachRemaining(s -> { throw new SingletonException(); }); 73 } catch (SingletonException ignore) { } 74 75 assertIteratorExhausted(it); 76 } 77 } 78