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Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.When the Android system is short of memory and the activity loses focus and is recycled by the system, when the activity is created again, the state such as View before the recovery data is displayed on the screen again is stored through onSaveInstanceState and onRestoreInstanceState;? 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:11凶手后悔小原久美子在黛绮丝的故事中，大家第一眼便看到了韩千叶。原本平静的江州发生命案。唐老爷在寿宴之上被一个名叫修杰的乐师行刺，但所幸只受到了轻伤，却没想到最后还是难逃厄运，竟在宴会之后离奇死亡.....该剧是一部讲述年轻人的梦想与野心的浪漫剧。希望看到这部戏的新世代们可以因此获得希望以及追逐梦想的勇气，也能了解家庭的重要。