多选题 Your virtual-world simulator is designed such that Grobnets can have several Ooflas, and Yazells support the contract implied by Whompers. Grobnets are a type of Yazell, and can also act as Floordums or Whompers. Which of the following code fragments legally represent this design? (Choose all that apply.)

A、 import java.util.*;interface Floordum { }interface Whomper { }class Grobnet extends Yazell implements Floordum {List＜Oofla＞o; }class Oofla { }class Yazell implements Whomper { }
B、 import java.util.*;class Oofla { }class Yazell implements Whomper { }class Floordum { }interface Whomper { }class Grobnet extends Yazell, Floordum { List＜Oofla＞o; }
C、 import java.util.*;interface Floordum { }interface Whomper { }class Grobnet extends Yazell implements Floordum, Oofla { }class Oofla { }interface Yazell implements Whomper { }
D、 import java.util.*;interface Floordum { }interface Whomper { }class Grobnet extends Yazell implements Floordum { Set＜Oofla＞ o; }class Oofla { }class Yazell {Whomper w; }

【正确答案】 A

【答案解析】