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一切议定，众人散去。Symantec Scan Engine 5. X for Windows"Teacher, when I synthesize crystals, I need to find different conditions to synthesize them, but there are too many tests. Do you have any better methods?" "What do you synthesize crystals for?" "Of course, it is to test its performance." "Then why do we stick to the need to synthesize crystals before testing properties? We can test properties with the results of each time. Maybe we can find better substances, can't we?" "Ah! Yes, thank you, teacher, I'll try it!" In an exchange with Mr. Sun Yimin, the teacher proved once again the correctness of the sentence "Don't stick to books and documents" while solving the problems of the team members.State mode-Allows an object to automatically change its behavior when its internal state changes, and the object looks like it has changed its class. The specific structure diagram is as follows:In order to make good use of the principle of composite reuse, we first need to distinguish the relationship between "Has-A" and "Is-A".