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多項(xiàng)選擇題

1. public class OuterClass { 
2. private double d1 = 1.0; 
3. // insert code here 
4. } 
Which two are valid if inserted at line 3?()  

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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