A.鼠標(biāo) B.鍵盤 C.麥克風(fēng) D.音響
A.a.hashcode()==b.hashcode() B.a.age==b.age C.a.toString().equals(b.toString()) D.a.name.equals(b.name)
A.nextInt() B.next() C.nextString() D.nextShort()