1 /* 2 * Copyright (c) 2012, 2017, 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 import java.util.Objects; 25 import java.util.Comparator; 26 import jdk.internal.misc.JavaLangAccess; 27 import jdk.internal.misc.SharedSecrets; 28 29 /* 30 * @test 31 * @bug 8013528 32 * @summary Test JavaLangAccess.newUnsafeString 33 * @modules java.base/jdk.internal.misc 34 * @compile -XDignore.symbol.file NewUnsafeString.java 35 * @run main NewUnsafeString 36 */ 37 public class NewUnsafeString { 38 39 static final JavaLangAccess jla = SharedSecrets.getJavaLangAccess(); 40 41 public static void testNewUnsafeString() { 42 String benchmark = "exemplar"; 43 String constructorCopy = new String(benchmark); 44 char[] jlaChars = benchmark.toCharArray(); 45 String jlaCopy = jla.newStringUnsafe(jlaChars); 46 47 if (benchmark == constructorCopy) { 48 throw new Error("should be different instances"); 49 } 50 if (!benchmark.equals(constructorCopy)) { 51 throw new Error("Copy not equal"); 52 } 53 if (0 != Objects.compare(benchmark, constructorCopy, Comparator.naturalOrder())) { 54 throw new Error("Copy not equal"); 55 } 56 57 if (benchmark == jlaCopy) { 58 throw new Error("should be different instances"); 59 } 60 if (!benchmark.equals(jlaCopy)) { 61 throw new Error("Copy not equal"); 62 } 63 if (0 != Objects.compare(benchmark, jlaCopy, Comparator.naturalOrder())) { 64 throw new Error("Copy not equal"); 65 } 66 67 if (constructorCopy == jlaCopy) { 68 throw new Error("should be different instances"); 69 } 70 if (!constructorCopy.equals(jlaCopy)) { 71 throw new Error("Copy not equal"); 72 } 73 if (0 != Objects.compare(constructorCopy, jlaCopy, Comparator.naturalOrder())) { 74 throw new Error("Copy not equal"); 75 } 76 77 // The following is extremely "evil". Never ever do this in non-test code. 78 jlaChars[0] = 'X'; 79 if (!"Xxemplar".equals(jlaCopy)) { 80 throw new Error("jla.newStringUnsafe did not use provided string"); 81 } 82 83 } 84 85 public static void main(String[] args) { 86 testNewUnsafeString(); 87 } 88 }