Japanese- Have your cake and eat it too.
Is there a way to say "to have your cake and eat it too," a common English idiom meaning "you can't have it both ways" in Japanese?

Question

Answer

虻蜂取らず（あぶはちとらず）= 虻も取れず、蜂も取れない

虻あぶ a horsefly　蜂はち a bee

First of all there are a horsefly and a bee on a spider's web. 
Then a spider went toward a horsefly, but it changed it's mind on the way, so it turn to a bee.
After all a spider did not catch both of them.

Do you understand my explanation in this English? Please correct if possible.

Answer

「東に近ければ、西に遠し」　あるいは、「二兎を追う者は、一兎をも得ず」も該当するのでは？！

Answer

「一得一失」? or「一挙両得とはいかない」?

(It's a bit different from 「二兎を追うものは一兎をも得ず」.)