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head first 设计模式-0x05 #17

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ichengzi opened this issue May 31, 2020 · 0 comments

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ichengzi commented May 31, 2020 •

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命令模式 Command

为了解耦，引入了中间对象， Command

Command 对象用户执行一个action的所有参数，以及一个指向action的方法引用

感觉还是C里边的函数指针的封装，类似c# 里的 delegate, java 的

Function<T,R>, 返回R
Consumer，无返回
Predicate，返回bool
Supplier，返回T, 无入参

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ichengzi issue 目录 #49

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