used by blog http://kazurof.hateblo.jp/entry/2014/06/23/011354

ECJProblem.java

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

public class ECJProblem {
  private static final String nantoka = "kantoka";

  public String doSomething(@TestAnnotation(nantoka) String nantoka) {
    return "doushita";
  }

  public static void main(String[] args) throws Exception {
    Method meth = ECJProblem.class.getMethod("doSomething", String.class);
    Annotation[][] ano = meth.getParameterAnnotations();
    System.out.println(((TestAnnotation) ano[0][0]).value());
  }
}

TestAnnotation.java

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
public @interface TestAnnotation {
  String value();
}