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讲述了发生在华北平原上的一个小村庄的故事。村党支部书记、村委会主任牛铁汉和他的副手谷满堂一心想带领大家走上致富道路，可由于法律意识不强和传统观念的束缚，他们在致富的道路上屡屡碰壁。投资损失数百万元后，牛铁汉引咎辞职，让位给谷满堂。牛铁汉的大儿子牛天意是城里一家大公司的总经理，出于对故乡的感情，他决定回家乡带领乡亲们共同致富。这是一部充满幽默、娱乐性很强的农村题材剧，具有浓厚的河北地方特色。跟乡民们不同，他们神情要镇定含蓄得多，然内心却极不平静——对于少年封王的张板栗，他们是既敬佩羡慕，又有些嫉妒酸涩。? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages:紫茄低下头继续煎药，不想再理他。Iterator patterns are created for collection objects, For collection objects, It must involve the addition and deletion of collection elements, and certainly supports the operation of traversing collection elements. If the traversal operation is also placed in the collection object at this time, the collection object will bear too many responsibilities. At this time, the responsibilities can be separated and the traversal of the collection can be placed in another object, which is the iterator object.