此时会弹出让你选择是创建一个新类(create a new class)还是使用一个已经存在的类(select an existing class)。创建新对话框类,输入新对话框类的类名,其他默认选项就可以了。
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Create a new class, and call it TraceUtil.
创建一个新的类,并称它为TraceUtil。
To create a new class, I begin with the sys.class function.
为创建新类,我首先使用sys . class函数。
Suppose that you would like to create a new class called FixedList.
假设您希望创建一个名为 FixedList 的新类。
Now I have the ability to say, I've got a new class, I can create instances of a line segment, and it's elements are themselves instances of points. OK?
这就是我们要讲模块化的地方了,现在我可以说,我创建了一个新类,我可以创建线段的实例了,这些实例的元素?
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