1 /* 2 * Copyright (c) 2013, 2024, 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 6298888 6992705 8161500 6304578 27 * @summary Check Class.toGenericString() 28 * @author Joseph D. Darcy 29 * @enablePreview 30 * @compile GenericStringTest.java 31 * @run main/othervm GenericStringTest 32 */ 33 34 import java.lang.reflect.*; 35 import java.lang.annotation.*; 36 import java.util.*; 37 38 @ExpectedGenericString("public class GenericStringTest") 39 public class GenericStringTest { 40 public Map<String, Integer>[] mixed = null; 41 public Map<String, Integer>[][] mixed2 = null; 42 43 public static void main(String... args) throws ReflectiveOperationException { 44 int failures = 0; 45 46 String[][] nested = {{""}}; 47 int[][] intArray = {{1}}; 48 49 Map<Class<?>, String> testCases = 50 Map.of(int.class, "int", 51 void.class, "void", 52 args.getClass(), "java.lang.String[]", 53 nested.getClass(), "java.lang.String[][]", 54 intArray.getClass(), "int[][]", 55 java.lang.Enum.class, "public abstract class java.lang.Enum<E extends java.lang.Enum<E>>", 56 java.util.Map.class, "public abstract interface java.util.Map<K,V>", 57 java.util.EnumMap.class, "public class java.util.EnumMap<K extends java.lang.Enum<K>,V>", 58 java.util.EventListenerProxy.class, "public abstract class java.util.EventListenerProxy<T extends java.util.EventListener>"); 59 60 for (Map.Entry<Class<?>, String> testCase : testCases.entrySet()) { 61 failures += checkToGenericString(testCase.getKey(), testCase.getValue()); 62 } 63 64 Field f = GenericStringTest.class.getDeclaredField("mixed"); 65 // The expected value includes "<K,V>" rather than 66 // "<...String,...Integer>" since the Class object rather than 67 // Type objects is being queried. 68 failures += checkToGenericString(f.getType(), "java.util.Map<K,V>[]"); 69 f = GenericStringTest.class.getDeclaredField("mixed2"); 70 failures += checkToGenericString(f.getType(), "java.util.Map<K,V>[][]"); 71 72 for(Class<?> clazz : List.of(GenericStringTest.class, 73 AnInterface.class, 74 LocalMap.class, 75 AnEnum.class, 76 AnotherEnum.class, 77 AValueClass.class)) { 78 failures += checkToGenericString(clazz, clazz.getAnnotation(ExpectedGenericString.class).value()); 79 } 80 81 if (failures > 0) { 82 throw new RuntimeException(); 83 } 84 } 85 86 private static int checkToGenericString(Class<?> clazz, String expected) { 87 String genericString = clazz.toGenericString(); 88 if (!genericString.equals(expected)) { 89 System.err.printf("Unexpected Class.toGenericString output; expected %n\t'%s',%n got %n\t'%s'.%n", 90 expected, 91 genericString); 92 return 1; 93 } else 94 return 0; 95 } 96 } 97 98 @Retention(RetentionPolicy.RUNTIME) 99 @interface ExpectedGenericString { 100 String value(); 101 } 102 103 @ExpectedGenericString("abstract interface AnInterface") 104 strictfp interface AnInterface {} 105 106 @ExpectedGenericString("abstract interface LocalMap<K,V>") 107 interface LocalMap<K,V> {} 108 109 @ExpectedGenericString("final enum AnEnum") 110 enum AnEnum { 111 FOO; 112 } 113 114 @ExpectedGenericString("enum AnotherEnum") 115 enum AnotherEnum { 116 BAR{}; 117 } 118 119 @ExpectedGenericString("final value class AValueClass<E>") 120 value class AValueClass<E> {}