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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.Some people made such demands during divorce:The host is the most important. People input data to the host computer through keyboard, mouse and other input devices. After data processing by the host computer, the results are output to us through output devices such as displays and printers. The main components of the host include: memory, hard disk, motherboard, graphics card, sound card, optical drive, floppy drive, etc. Now many graphics card-like components can be integrated into the motherboard. CPU is also called central processing unit. CPU is the abbreviation of Central Processing Unit in English. As important as people's brains. It directs and dispatches all the work of the computer. Usually we refer to the CPU model when we say Ben 2, Ben 3 and Ben 4.8? Activity Monitor明朝万历年间，东宫太子朱常洛与大太监张诚在朝廷互相对衡。太子及后听得钦天监的预言，决定派人将宫中魏姓太监斩杀。张诚见一众门生被杀，密谋刺杀太子的未过门妻子郭倩，藉此报复洩愤。Thank you for the two big ones on Reddit:　　時光在一瞬間回到了1995年5月9日，鄧麗君過世的這一天，開啟了阿遠、俊朋、博啟及小光的青春歲月，當時他們17歲....