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First, the contents of the queue are taken out and the queue is emptied to prevent queue changes during processing.Further: The factory method is used to process the creation of objects and delay the implementation of this creation of objects to subclasses, so that the code about the base class in the customer code is decoupled from the subclass object creation code.Channel 4的5集剧《#男孩们# Boys》讲述80年代时三个男孩Ritchie（Olly Alexander饰）﹑Roscoe及Colin的故事，剧情长度将横跨10年。三名主角在18岁时离开家乡，带着希望﹑野心来到伦敦。然而当他们感染上爱滋病后（当年有发生血液污染案，造成大量人感染肝炎及爱滋病），这在当时仍然充斥着各种谣言的病使他们在别人眼中是威胁﹑恐怖的存在，不过主角们也因此团结起来。拎着方便袋，他走出了宿舍。In other words, their daily income is 50 rupees. In fact, as long as the hawker does not spend all the 50 rupees, he saves 5 rupees a day for the next day's purchase. Due to the compound interest effect, they only need 50 days, so they don't have to borrow the 1,000 rupees.Deep replication: After an object is replicated, both the basic data type and the reference type are recreated. In short, the deep copy has been completely and completely copied, while the shallow copy is not completely copied.