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Combination mode is sometimes called part-whole mode. It is more convenient to deal with problems like tree structure. Look at the diagram:Here we seem to simulate the process of a collection class, does it feel great? In fact, each class in JDK is also these basic things, plus some design patterns and some optimization. As long as we learn and master these things, we can also write our own collection classes and even frameworks!Finally, refuting the 10,000-hour law can play a clever thought game, which is the Sand Paradox put forward by the ancient Greek philosopher Eubulides:该剧主要讲了警察Bishop和Pike两人搭档在伦敦东区追击罪犯的故事。从表面上来看Bishop和Pike有许多共同之处，他们不仅很酷，而且聪明又强硬；此外他们两人关系很好，总是能够支持和帮助对方。然而，他们的家庭背景不同，加入警察队伍的动机也不同，工作之外的情感生活因此也不同。Bishop在养老院和街头长大，从不认识他的父亲。Pike来自理想的家庭，他跟随警察父亲的脚步加入警局，同时渴望做出自己的成绩。尽管存在着这些差异，但Bishop和Pike都保持着相同的道德准则。即使他们之间的化学反应看起来随时会爆炸，但他们的工作仍然非常出色。玉米崩溃，抱头弯下身子大叫道：我不知道——……事后，玉米被关进二房的书房，看押了起来。嘿呦。然后，她提着一口气，手扯绳索，依旧如刚才那样脚蹬树干，就那么疾走上去了。