SWD392 PT2

What happens in a Layers of Abstraction pattern?

• Each layer uses services in the layer immediately below it.

• Each layer uses services in the layer immediately above it.

• Each layer uses services in the layers immediately above it and below it.

• Each layer is independent of the other layers

What is an event in a state machine?

• A discrete signal that causes a change of state

• An input from the external environment

• An input that is True or False

• The result of a state transition

Which of the following interactions could happen on an interaction diagram?

• An external user sends a message to a user interaction object.

• An external user sends a message to an entity object.

• An external user sends a message to an I/O object.

• An external user sends a message to a printer object.

A producer sends a message to a consumer. Which one of the following is synchronous message communication with reply?

• The producer waits for a response from the consumer.

• The producer does not wait for a response from the consumer.

• The producer goes to sleep.

• The producer waits for a timeout.

What does a sequence diagram depict?

• The sequence of external objects communicating with each other

• Classes and their relationships

• Software objects and the sequence of their interactions

• The external objects communicating with the system

Which of the following statements is NOT true for a component?

• A composite object composed of other objects

• An operation

• A simple object

• Provides an interface

What does a communication diagram depict?

• The sequence of external objects communicating with each other

• Classes and their relationships

• Software objects and the sequence of their interactions

• The external objects communicating with the system

When is a control subsystem required?

• If the subsystem needs to control several internal objects

• If the subsystem needs to control multiple I/O devices

• If the subsystem needs to control multiple client subsystems

• If the subsystem needs to control the execution of other subsystems

What is a state in a state machine?

• A recognizable situation that exists over an interval of time

• A condition that is True or False

• An input from the external environment

• An output from the system

What happens in a Call/Return pattern?

• A calling operation in the calling object sends a message to an operation (a.k.a. method) in the called object.

• A calling operation in the calling object invokes an operation (a.k.a. method) in the called object.

• The calling object waits for a response from the called object.

• The calling object does not wait for a response from the called object.