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B) Use the tool BlueJ. The biggest advantage of BlueJ is that it provides a simple class diagram. As I did in the concise design pattern Java, I seldom draw class diagrams specifically, but take screenshots in BlueJ. When students write demonstration programs on the computer, they often look at his class diagram first to judge whether his program is correct or not, and then look at the source code when necessary.The code is not difficult to understand. The down event and the 3rd and 5th events (counting from 0) in the MyView consumption event sequence are implemented, and other events are not consumed. At the same time, for convenience of viewing, the value of X is printed out in the log. The log is as follows (the log for each event is separated by empty lines):都是驻扎了兵士的，防守很严密的样子。不对。然而在前进的程途中，却逐渐树影凄凉，花蝶匿迹，果实无存，最后终于发觉到达一个沙漠。For example, if the duration of induction is 15.3 seconds, then the number of times of induction is 30, the time is 15.5 seconds, the number of times is 31, the time is 15.7 seconds, and the number of times is still 31Rules for OUTPUT can exist in: raw table, mangle table, nat table, filter table.