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  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
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  23 
  24 /*
  25  * @test
  26  * @bug 6298888 6992705 8161500 6304578
  27  * @summary Check Class.toGenericString()
  28  * @author Joseph D. Darcy
  29  */
  30 
  31 import java.lang.reflect.*;
  32 import java.lang.annotation.*;
  33 import java.util.*;
  34 
  35 @ExpectedGenericString("public class GenericStringTest")
  36 public class GenericStringTest {
  37     public Map<String, Integer>[] mixed = null;
  38     public Map<String, Integer>[][] mixed2 = null;
  39 
  40     public static void main(String... args) throws ReflectiveOperationException {
  41         int failures = 0;
  42 
  43         String[][] nested = {{""}};
  44         int[][]    intArray = {{1}};
  45 
  46         Map<Class<?>, String> testCases =
  47             Map.of(int.class,                          "int",
  48                    void.class,                         "void",
  49                    args.getClass(),                    "java.lang.String[]",
  50                    nested.getClass(),                  "java.lang.String[][]",
  51                    intArray.getClass(),                "int[][]",
  52                    java.lang.Enum.class,               "public abstract class java.lang.Enum<E extends java.lang.Enum<E>>",
  53                    java.util.Map.class,                "public abstract interface java.util.Map<K,V>",
  54                    java.util.EnumMap.class,            "public class java.util.EnumMap<K extends java.lang.Enum<K>,V>",
  55                    java.util.EventListenerProxy.class, "public abstract class java.util.EventListenerProxy<T extends java.util.EventListener>");
  56 
  57         for (Map.Entry<Class<?>, String> testCase : testCases.entrySet()) {
  58             failures += checkToGenericString(testCase.getKey(), testCase.getValue());
  59         }
  60 
  61         Field f = GenericStringTest.class.getDeclaredField("mixed");
  62         // The expected value includes "<K,V>" rather than
  63         // "<...String,...Integer>" since the Class object rather than
  64         // Type objects is being queried.
  65         failures += checkToGenericString(f.getType(), "java.util.Map<K,V>[]");
  66         f = GenericStringTest.class.getDeclaredField("mixed2");
  67         failures += checkToGenericString(f.getType(), "java.util.Map<K,V>[][]");
  68 
  69         for(Class<?> clazz : List.of(GenericStringTest.class,
  70                                      AnInterface.class,
  71                                      LocalMap.class,
  72                                      AnEnum.class,
  73                                      AnotherEnum.class)) {
  74             failures += checkToGenericString(clazz, clazz.getAnnotation(ExpectedGenericString.class).value());
  75         }
  76 
  77         if (failures > 0) {
  78             throw new RuntimeException();
  79         }
  80     }
  81 
  82     private static int checkToGenericString(Class<?> clazz, String expected) {
  83         String genericString = clazz.toGenericString();
  84         if (!genericString.equals(expected)) {
  85             System.err.printf("Unexpected Class.toGenericString output; expected %n\t'%s',%n got %n\t'%s'.%n",
  86                               expected,
  87                               genericString);
  88             return 1;
  89         } else
  90             return 0;
  91     }
  92 }
  93 
  94 @Retention(RetentionPolicy.RUNTIME)
  95 @interface ExpectedGenericString {
  96     String value();
  97 }
  98 
  99 @ExpectedGenericString("abstract interface AnInterface")
 100 strictfp interface AnInterface {}
 101 
 102 @ExpectedGenericString("abstract interface LocalMap<K,V>")
 103 interface LocalMap<K,V> {}
 104 
 105 @ExpectedGenericString("final enum AnEnum")
 106 enum AnEnum {
 107     FOO;
 108 }
 109 
 110 @ExpectedGenericString("enum AnotherEnum")
 111 enum AnotherEnum {
 112     BAR{};
 113 }