多項選擇題

public class OuterClass { 
private double d1  1.0; 
//insert code here  
}  
You need to insert an inner class declaration at line2. Which two inner class declarations are valid?() 

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();  }

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