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It is mainly used to reduce the number of objects created to reduce memory footprint and improve performance. This type of design pattern belongs to structural pattern, which provides a way to reduce the number of objects and thus improve the object structure required by application.Advantages of using thread pools:[Truth] On the evening of August 26, Xinhua News Agency issued a document saying, "The Olympics did not win medals, and Zimbabwe's President ordered the arrest of athletes? Fake, said: Zimbabwean officials said on the 26th that the media's news that "Zimbabwean President Mugabe requested the arrest of Zimbabwean athletes participating in the Rio Olympics" was totally untrue.The essence of these 23 design patterns is the practical application of object-oriented design principles, and it is a full understanding of the encapsulation, inheritance and polymorphism of classes, as well as the association and combination of classes.尤其是末尾一句，称呼从宋令尹变成直呼其名，本身就是一种信号。Li Shanglong, a young writer, told a story: When he first went to college, a classmate in the dormitory was very stingy. On one occasion, Li Shanglong's cell phone ran out of electricity, so he asked this classmate to borrow his phone and call home. After the call, Li Shanglong returned the phone to him and turned out of the dormitory.