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Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:R1 +//Button-Triggers Attack我小葱还是将军哩，也没跟李家这样较劲。转眼间，光升入了高中，为了完成和若叶的梦想，光加入了棒球队，没想到却被编入了毫无用武之地的“肥料组”。隔年，青叶也考入了同一所学校。在青叶的鼓励下，光和队友们开始了以甲子园为最终目标的严酷训练。只要不放弃棒球，我们就能够永远的在一起。只要我们能够聚在一起，那在角落里默默等待着的，代表着幸福的四片叶的三叶草，就绝对会有被发现的那一天。Taking the CSRFTester tool as an example, the testing principle of the CSRF vulnerability detection tool is as follows:大苞谷忙问什么事。小小司机见证万千世态炎凉，四人家庭演绎都市感情传奇