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单项选择题 1. class Super {  2. public float getNum() { return 3.0f; }  3. }  4.   5. public class Sub extends Super {  6.   7. }  Which method, placed at line6, causes compilation to fail?()  

A、 public void getNum(){}

B、 public void getNum(double d){}

C、 public float getNum() { return 4.0f; }

D、 public double getNum(float d) { return 4.0d; }

  • A
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