對(duì)于下列代碼:

下述哪些方法可以加入類(lèi)Child?()
A. int addValue( int a, int b ){// do something...}
B. public void addValue (int a, int b ){// do something...}
C. public int addValue( int a ){// do something...}
D. public int addValue( int a, int b )throws MyException {//do something...}