TAW_12 Chapter 5, Object-Oriented Events

Question 1

Events can have Import and Export parameters?

Answer 1

No, Events can only have export parameters

Question 2

There are instance and class (static events?

Answer 2

True

Question 3

In UML, how are events depicted

Answer 3

Under a solid line that separates the methods from events
Under <>
+ On_vehicle_created( )
{ for event = vehicle_created of lcl_vehicle }

Question 4

T or F, static events can only be called by static methods?

Answer 4

False, instances can raise static events

Question 5

Can instance constructors trigger events?

Answer 5

Yes

Question 6

Give an example of a handler event signature

Answer 6

METHODS on_vehicle_create FOR EVENT vehicle_create of lcl_vehicle importing sender

Question 7

What are the two ways a handler method can be triggered?

Answer 7

By RAISE EVENT or CALL METHOD

Question 8

Static methods can only trigger static events?

Answer 8

True

Question 9

How can the registration of an event handler be deactivated?

Answer 9

Using the ACTIVTION ‘ ‘

For example SET HANDLER lcl->on_hotspot for For all instances activation = ‘ ‘

Question 10

Event handlers can only have the same visibility of the events they are handling?

Answer 10

False. They can be the same or more restrictive. For example a public event can be handled in a privavte handler, but a private event can not be handled in a public handler

Question 11

Can a class be defined as an interface component?

Answer 11

No

Question 12

Can a handler be set within the instance constructor?

Answer 12

According to the demo, it is not necessary to have a separate handler class. The handler method can be defined in the instance as a method and set in the constructor