单选题Which will declare the 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 foid methoda （）：E protected void methoda （double d1） {}
单选题
Which will declare the 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 foid methoda （）：
E
protected void methoda （double d1） {}
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