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根据教材3.7.3节中的图(3.20)按照开闭原则改造的算式的类结构,以及实现的部分代码 class AdditionOperation extends BinaryOperation { int calculate(int left, int right){ return left+right; } } 类SubstractOperation中的calculate代码中return什么?
参考答案和解析
精教;精教类
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简教;简教类
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介绍性;介绍类
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锻炼性;锻炼类
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简教;简教类
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介绍性;介绍类
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锻炼性;锻炼类
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