2, class Super{ public float getNum(){return 3.0f;} } public class Sub extends Super{ } which method, placed at line 6, 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){
还不错 ,很实用,谢谢楼主