(单选题)17: class Super{public float getNum(){return 3.0f;}}
public class Sub extends Super{
//overload
}
which method, placed at overload, will cause a compiler error?
A: public float getNum(){return 4.0f;}
B: public void getNum(){}
C: public void getNum(double d){}
D: public double getNum(float d){return 4.0d;}
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