提炼并归纳了“决策表问题”对应的数学计算公式——特殊的多元分段函数，并指出该类分段函数的特点。
The paper summarizes the math formula of decision-making table problem and points characteristic, which a sort of multi-items subsection function owns.
当你发现多个构造函数含有同样的逻辑时，将该逻辑提炼到一个共同的构造函数中去。
When you find that multiple constructors contain the same logic, factor that logic into a common constructor instead.
当你发现多个构造函数含有同样的逻辑时，将该逻辑提炼到一个共同的构造函数中去。
When you find that multiple constructors contain the same logic, factor that logic into a common constructor instead.
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