小编Til*_*ino的帖子

当带注释的类型是嵌套的通用接口时,似乎无法通过反射访问TYPE_USE注释.

请注意以下示例:

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.AnnotatedType;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Map;
import java.util.Map.Entry;

public class LostAnnotation {
  @Retention(RetentionPolicy.RUNTIME)
  @Target(ElementType.TYPE_USE)
  public @interface SomeTypeAnnotation {
  }

  @SomeTypeAnnotation Map<String, String> map;
  @SomeTypeAnnotation Entry<String, String> entry;

  public static @SomeTypeAnnotation Entry<String, String> someMethod(
      @SomeTypeAnnotation Map<String, String> map,
      @SomeTypeAnnotation Entry<String, String> entry) {
    return null;
  }

  public static void main(String[] args) throws Exception {
    Class<LostAnnotation> clazz = LostAnnotation.class;
    Method method = clazz.getMethod("someMethod", Map.class, Entry.class);
    AnnotatedType[] types = method.getAnnotatedParameterTypes();

    print("map …