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多选题
现有:   1. class Synapse {    2.    protected int gap() { return 7; }    3. }   4.     5. class Creb extends Synapse {    6.   // insert code here   7. }    分别插入到第 6 行,哪三行可以编译?()
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); }


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