A.p.setWeight(420);
B.p.changePayload(420);
C.p=newPayload(420);
D.Payload.setWeight(420);
E.p=Payload.setWeight(420);
正确答案:参考A

A.p.setWeight(420);
B.p.changePayload(420);
C.p=newPayload(420);
D.Payload.setWeight(420);
E.p=Payload.setWeight(420);
正确答案:参考A