Abstract methods are defined using {abstract} modifier. This modifier can be used at start or end of the line.
abstractMethod.txt
@startuml abstract class ArithmeticUtil{ int sum(int a, int b) int mul(int a, int b) {abstract} int sub(int a, int b) int div(int a, int b) {abstract} } @enduml
Above snippet generate below diagram.
From the above diagram, you can notice
a. Abstract class is annotated with letter ‘A’ in a circle
b. Abstract methods are drawn in italic.
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