策略模式（Strategy）

public?class?New?{ ??????public?static?Advisor?getAdvisor(int?cas)?{ ??????????switch?(cas)?{ ??????????case?1: ??????????????return?new?Stratery1("策略1").getAdvisor(); ??????????case?2: ??????????????return?new?Stratery2("策略2").getAdvisor(); ??????????case?3: ??????????????return?new?Stratery3("策略3").getAdvisor(); ??????????default: ??????????????return?null; ??????????} ??????} ??????public?static?void?main(String[]?args)?{ ??????????Advisor?a?=?getAdvisor(1); ??????????System.out.println(a); ??????} ??}???

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重构的核心思想就是：将一个操作分布在一组相关的类中。