Requests are the only way to get an object to execute an operation.
Operations are the only way to change an object's internal data.
这就是面向对象的思维
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Requests are the only way to get an object to execute an operation.
Operations are the only way to change an object's internal data.
这就是面向对象的思维
转载于:https://www.cnblogs.com/weizhixiao/archive/2013/04/08/5697323.html