試題詳解

Which change can you make to Target without affecting Client?
(A) Line 4 of class Target can be changed to return i++;
(B) Line 2 of class Target can be changed to private int i = 1;
(C) Line 3 of class Target can be changed to private int addOne(){
(D) Line 2 of class Target can be changed to private Integer i = 0;