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；
正确答案:D
答案解析:有
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