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The above design, as commented above, when executing the Resize method of SmartTest, if a rectangular object is passed in, when the height is greater than the width, the width will be automatically increased until it exceeds the height. However, if a square object is passed in, it will fall into a dead loop. The fundamental reason at this time is that rectangles cannot be the parent class of squares. Since there is a problem, they can be reconstructed so that both of them inherit from quadrilateral classes. The refactoring code looks like this:克里和她的女儿艾拉试图解决她已故父亲的遗产，但他们雇用的承包商带来了一系列致命的灾难。7 ", if not a sufficient number of Sentinel processes agree that the Master master server is offline, the objective offline status of the Master master server is removed. If the Master master server sends a PING command to the Sentinel process again to return a valid reply, the subjective offline status of the Master master server is removed.The First World War lasted for 4 years and 3 months from July 1914 to November 1918. The war swept across Europe, Asia and Africa, with 34 countries and regions participating in the war. The population affected by the war reached more than 1.5 billion, accounting for 75% of the world's population at that time. The two sides mobilized 889 divisions with a total of 74 million troops, 8.4 million killed and 21 million injured.古来明君不怕出错，贵在知错能改。