Question

How to show this class in a UML diagram?

    abstract class Point{
abstract String getXPoint();
abstract String getYPoint();
   }

Answer 1

For example, With <<abstract>> next to the class name, an inheritance mapping (if any class implements it) and the method declaration in italic and bold.

Also, I’ve seen many diagrams that take the poetic license of explicitly adding abstract before the method’s name but I’d stick to pure UML.

 ______________________
|     <<abstract>>     |
|        Point         |
|______________________|
| +getXPoint(): String |
| +getYPoint(): String |
|______________________|

Note: I assume your abstract methods are public.