A.抽象方法B.普通方法C.構(gòu)造方法D.靜態(tài)方法
A.SuperClass s =new SubClass()B.SubClass sc =(SubClass)superClassC.SubClass s =new SubClass()D.SuperClass s =new SuperClass()
A.breakB.returnC.System.exit(0)D.System.exit(1)