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The code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.A rich man wanted to help a poor man become rich. That winter, he gave him a cow: "If you use the cow well, you will be able to get rid of poverty in autumn." The poor began to struggle with hope.就像原来那个世界，金庸就喜欢时不时地修改一下自己的小说，但即使是金庸的忠实粉丝也大多都不买账。From the King of Destruction所以就安排了二儿子徐宣带着小妹前去，一来是为了保护徐彤，当然了保护的同时也是监视，第二就是一路上再趁徐彤心情高兴的时候，适当开导一下。公子。总督也令军士待命，与翻译自行前来。