after class free writing 课后非命题写作
Taking notes in class is not writing down everything the teacher has said, but recording the key points of the teacher's words after comprehension.
上课做笔记并不是把老师说的话全都记下来，而是在理解后记下老师所说的要点。
If you're just writing a single class to test your intuition about an API and you will throw it away immediately after running it once, then you don't have to put it in a package.
如果您在编写一个只使用一次就丢掉的类——比如测试一个API的类——则无需将它放到包中。
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