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单项选择题 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;

  • D
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