1. class Synapse {
2. protected int gap() { return 7; }
3. }
4.
5. class Creb extends Synapse {
6. // insert code here
7. }
分別插入到第 6 行,哪三行可以編譯?()
A. int gap() { return 7; }
B. public int gap() { return 7; }
C. private int gap(int x) { return 7; }
D. protected Creb gap() { return this; }
E. public int gap() { return Integer.getInteger ("42"); }