Drawing an UML abstract class on the paper without italic?

Question

我应该如何在不使用斜体字体的情况下在纸上手工绘制的UML图中表示抽象类（在Java中）？

Answer 1

The annotation {abstract} below the classname can be used.

Should look like this:

+---------------+
|   Classname   |
|   {abstract}  |
+---------------+

UML specs p. 99:

The name of an abstract Classifier is shown in italics, where permitted by the font in use. Alternatively or in addition, an abstract Classifier may be shown using the textual annotation {abstract} after or below its name.

Answer 2

就个人而言，如果你不能使用斜体，我会把abstract Foo写成标题。