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Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.Production, output of content, including UGC, PGC and homemade content一宿无话，次日清晨，周菡早早起来伺候爷爷茶饭，神色虽然不似昨日那般欢喜，也没失魂落魄，只略有些沉默而已。? This mode is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while the multiple factory method mode provides multiple factory methods to create the object separately. Diagram:这个消息立刻飞速扩散。这才是范增最为担忧的问题，要是真的打起来，是他们所承受不起的。ViewGroup and View's onTouchEvent methods handle events, so this event can only be handled in two ways: