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7. Enter "" to run the class file just compiled.霸王……使者跪在地上，着急不已，结结巴巴，半天说不出话来，让众人更为着急。Command mode belongs to the behavior mode of an object. Command mode encapsulates a request or operation into an object, and separates the responsibility of issuing the command from the responsibility of executing the command through abstraction of the command. The implementation of command mode can provide the functions of revocation and recovery of commands. The specific structure diagram is shown below.The next three years will be the decisive period for building a well-off society in an all-round way. By 2020, our first 100-year goal will be achieved. So, standing at a new historical starting point, how can we move towards the goal of the second century? The report of the 19th National Congress pointed out that we should not only build a well-off society in an all-round way and achieve the goal of the first century, but also take advantage of the situation to embark on a new journey of building a modern socialist country in an all-round way and march towards the goal of the second century.