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...}

A.ab
B.$_3
C.3ab
D.ab3