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Next, overwrite the Light class, and now instead of using a string to record the current state, use a more three-dimensional state object. Create a state object for each state class in the constructor of the Light class, so that you can clearly see how many states there are in the light. The code is as follows:他已经彻底搞清楚，自己的命运从来不在自己手中，他能做的，只有继续读书，拼命读书。This book was written by two authors, one is a psychologist and the other is a science writer. More than 10 years ago, we began to often discuss the theme of outstanding people and "deliberate practice", and five years ago we began to seriously write books on this theme. During that time, the book slowly took shape in the ideological collision between the two of us, so that it is now difficult for us to distinguish which part of the book was put forward by whom. All we know is that it is much better and completely different for the two of us to write this book together than for us to write it alone.求职受到挫折，现在自由职业者的寺田亚希（24岁）被同居的男朋友甩了，在朋友合租的房子里生活。在那里再会了的，是初中的同学，初次男朋友兼第一次「做了」对方·本行智也。近两年一直“不拍”的他，偶然与亚希接触后，不知为何反应很奇怪！！亚希答应绝对不...现在好了，三角恋已经升级为四人相爱相杀。Synflood attack is the most common DDoS attack on the current network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing.