public AnnotationValue getDefaultValue()
Returns the default value if this executable is an annotation
type element.  Returns {@code null} if this method is not an
annotation type element, or if it is an annotation type element
with no default value.

 public List<VariableElement> getParameters()
Returns the formal parameters of this executable.
They are returned in declaration order.

 public TypeMirror getReturnType()
Returns the return type of this executable.
Returns a NoType  with kind  VOID 
if this executable is not a method, or is a method that does not
return a value.

 public Name getSimpleName()
Returns the simple name of a constructor, method, or
initializer.  For a constructor, the name {@code ""} is
returned, for a static initializer, the name {@code ""}
is returned, and for an anonymous class or instance
initializer, an empty name is returned.

 public List<TypeMirror> getThrownTypes()
Returns the exceptions and other throwables listed in this
method or constructor's {@code throws} clause in declaration
order.

 public List<TypeParameterElement> getTypeParameters()
Returns the formal type parameters of this executable
in declaration order.

 public boolean isVarArgs()
Returns {@code true} if this method or constructor accepts a variable
number of arguments and returns {@code false} otherwise.