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9. The single-person and single-pot meal distribution system is both hygienic and unique. The small pot can boil in 2-3 minutes. Compared with other brands, it is faster and saves time, greatly exerts energy efficiency, and realizes low cost and high cost suppression.严嵩实话实说一口否定。　　王小虎不知令牌底蕴，在庆功之际被黑帮伏击，因缘际会下他反被同时来取令牌的黑帮保镖王小龙所救，更遇上持双节棍的金发少年石黑龙仗义相助。罗刹令被王小龙取得，王小虎惊见其身上玉佩，发现王小龙竟是其同父异母的兄长。In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.受电视征婚节目的启发，丁二春和师弟姚双喜精心策划、打造的“全成热恋”社区婚介所终于开业了。丁二春摇身变成了社区最有争议的“首席男媒婆”。开业当天，丁二春信心满满的唱起了《中国好声音》，并且得意忘形跳起了《江南style》……姚双喜提醒二春近水楼台先得月，遇到条件不错的征婚女应该先下手为强。其实丁二春对再婚毫无兴趣，他告诉师弟，这辈子让他动心的女人只有两个，一个是病故的前妻，另一个则是他的初恋白小青。白小青调到社区医院工作，来浅水湾小区租房时与二春不期而遇。得知小青刚刚离异，二春心中暗自窃喜，难不成这是上天安排让他与梦中情人重续前缘？老光棍马四辈饿急了跑到桃花村偷包谷，被民兵抓住游街示众。送往公社途中，土崖塌方，将桃花村姑娘高枝枝埋在底下，马四辈奋不顾身跳崖抢救。D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program: