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Article 4 Scope of ApplicationWhen the child was ill at night, his wife went to the hospital anxiously with the child in her arms. He was outside to socialize without knowing anything about it.He is a typical good son. Diligent in making money and marrying a virtuous wife, the family does not have to worry about it.他提醒道：这下可帮了高凡的忙了：这火把他们逃走的踪迹烧得一干二净，连小灰也找不到了，咱们还要腾出工夫来救火。KingdomFactory is the Kingdom Factory; OrcKingdomFactory is the Kingdom of Demons; ElfKingdomFactory is a kingdom of elves.The core idea is: when the state of the object changes, it changes its behavior at the same time, which is very understandable! Take QQ for example. There are several states, online, invisible, busy, etc. Each state corresponds to different operations, and your friends can also see your state. Therefore, the state mode is two points: 1. You can obtain different behaviors by changing the state. 2. Your friends can see your changes at the same time. Look at the picture: