A. static class InnerOne {  public double methoda（） {return d1；}  }
B. static class InnerOne {  static double methoda（） {return d1；} }
C. private class InnerOne {  public double methoda（） {return d1；} }
D. protected class InnerOne {  static double methoda（） {return d1；} }
E. public abstract class InnerOne {  public abstract double methoda（）；  }

A. The default constructor initializes method variables.
B. The default constructor invokes the no-parameter constructor of the superclass.
C. The default constructor initializes the instance variables declared in the class.
D. If a class lacks a no-parameter constructor，， but has other constructors， the compiler creates a default constructor.
E. The compiler creates a default constructor only when there are no other constructors for the class.