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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.红椒听了一愣。Turn on/off HUD H H-Li Qiang made it clear more than half a year ago that the "whether Shanghai wants manufacturing industry" that was once debated by the outside world is a pseudo-issue-Shanghai, as a former manufacturing center, still cannot do without manufacturing industry to cope with the current and future economic transformation and domestic and foreign competition challenges. The real question is, what kind of manufacturing is needed?