UML序列图WindowListener

Question

I'm just starting to learn how to write Sequence Diagrams for Java programs at the moment.

I have the task to write a Sequence Diagram for a given Java Class called KeyTest that extends the java.awt.Frame class. In this diagram, a KeyListener and a WindowListener is added to the KeyTest class via this.addKeyListener(this) . How do I implement that and the KeyPressed, KeyTyped and KeyReleased Operations in the Sequence Diagram?

For some reason we have only been told how to add an ActionListener to a button, but not to the class itself.

Answer 1

All those are operations of a class. And these correspond to messages sent from somewhere to this class, triggering the execution of the operation. Just like so:

The fact that KeyTest extends java.awt.Frame goes to a class diagram and will be shown with a generalization.