单选题Which will declare a method that forces a subclass to implement it？ （）A Public double methoda（）；B Static void methoda （double d1） {}C Public native double methoda（）；D Abstract public void methoda（）；E Protected void methoda （double d1）{}
单选题
Which will declare a method that forces a subclass to implement it？ （）
A
Public double methoda（）；
B
Static void methoda （double d1） {}
C
Public native double methoda（）；
D
Abstract public void methoda（）；
E
Protected void methoda （double d1）{}
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