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State: Problem A finite number of states The program behaves differently within a state Can be switched from one state to another, and switching rules 阅读全文
posted @ 2024-12-24 14:25
Mephostopheles
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Memento: Problem Example: supporting undo in a text editor app Problem 1: private fields cannot be accessed Problem 2: when fields are made public, re 阅读全文
posted @ 2024-12-24 11:27
Mephostopheles
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