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23 
24 /*
25  * @test
26  * @bug 8004698 8007278
27  * @summary Unit test for annotations on TypeVariables
28  */
29 
30 import java.util.*;
31 import java.lang.annotation.*;
32 import java.lang.reflect.*;
33 import java.io.Serializable;
34 
35 public class TypeParamAnnotation {
main(String[] args)36     public static void main(String[] args) throws Exception {
37         testOnClass();
38         testOnMethod();
39         testGetAnno();
40         testGetAnnos();
41     }
42 
check(boolean b)43     private static void check(boolean b) {
44         if (!b)
45             throw new RuntimeException();
46     }
47 
testOnClass()48     private static void testOnClass() {
49         TypeVariable<?>[] ts = TypeParam.class.getTypeParameters();
50         check(ts.length == 3);
51 
52         Annotation[] as;
53 
54         as = ts[0].getAnnotations();
55         check(as.length == 2);
56         check(((ParamAnno)as[0]).value().equals("t"));
57         check(((ParamAnno2)as[1]).value() == 1);
58 
59         as = ts[1].getAnnotations();
60         check(as.length == 0);
61 
62         as = ts[2].getAnnotations();
63         check(as.length == 2);
64         check(((ParamAnno)as[0]).value().equals("v"));
65         check(((ParamAnno2)as[1]).value() == 2);
66     }
testOnMethod()67     private static void testOnMethod() throws Exception {
68         TypeVariable<?>[] ts = TypeParam.class.getDeclaredMethod("foo").getTypeParameters();
69         check(ts.length == 3);
70 
71         Annotation[] as;
72 
73         as = ts[0].getAnnotations();
74         check(as.length == 2);
75         check(((ParamAnno)as[0]).value().equals("x"));
76         check(((ParamAnno2)as[1]).value() == 3);
77 
78         as = ts[1].getAnnotations();
79         check(as.length == 0);
80 
81         as = ts[2].getAnnotations();
82         check(as.length == 2);
83         check(((ParamAnno)as[0]).value().equals("z"));
84         check(((ParamAnno2)as[1]).value() == 4);
85     }
86 
testGetAnno()87     private static void testGetAnno() {
88         TypeVariable<?>[] ts = TypeParam.class.getTypeParameters();
89         ParamAnno a;
90         a = ts[0].getAnnotation(ParamAnno.class);
91         check(a.value().equals("t"));
92     }
testGetAnnos()93     private static void testGetAnnos() throws Exception {
94         TypeVariable<?>[] ts = TypeParam.class.getDeclaredMethod("foo").getTypeParameters();
95         ParamAnno2[] as;
96         as = ts[0].getAnnotationsByType(ParamAnno2.class);
97         check(as.length == 1);
98         check(as[0].value() == 3);
99     }
100 }
101 
102 class TypeParam <@ParamAnno("t") @ParamAnno2(1) T,
103                  U,
104                  @ParamAnno("v") @ParamAnno2(2) V extends Runnable> {
105     public <@ParamAnno("x") @ParamAnno2(3) X,
106             Y,
foo()107             @ParamAnno("z") @ParamAnno2(4) Z extends Cloneable> void foo() {}
108 }
109 
110 @Target(ElementType.TYPE_PARAMETER)
111 @Retention(RetentionPolicy.RUNTIME)
112 @interface ParamAnno {
value()113     String value();
114 }
115 
116 @Target(ElementType.TYPE_PARAMETER)
117 @Retention(RetentionPolicy.RUNTIME)
118 @interface ParamAnno2 {
value()119     int value();
120 }
121