@Target({METHOD, CONSTRUCTOR, FIELD, PARAMETER})
@Retention(RUNTIME)
public @interface W
{
    String value() default "WANGNING";

}

public class Demo
{
    @W()
    public void setMethod(){
    }
}

public class RunTests
{
    public static void main(String[] args) throws Exception
    {
        for (Method m : Class.forName("homework.Demo").getMethods())
        {
            if(m.isAnnotationPresent(W.class)){
                System.out.println(m.getAnnotation(W.class));
                System.out.println(m.getDefaultValue());
            }
        }
    }
}