Lecture 9 - State Machine Diagrams Quiz

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Questions and Answers

In the bank account example, how many states are mentioned?

Four (correct)

Three

Two

Five

What are the possible transitions for an account in the Active state?

Remain active, become overdrawn, or be closed (correct)

Become overdrawn, be closed, or be deleted

Remain active, become overdrawn, or be deleted

Remain active, become closed, or be deleted

What is the initial state of an account in the bank account example?

Deleted

Overdrawn

Closed

Active (correct)

Which state indicates that an account has been terminated?

Deleted Signup and view all the answers

What does the diagram in the bank account example show?

When events are legal Signup and view all the answers

What can occur when an account is in the Active state?

It can remain active or become overdrawn Signup and view all the answers

Which state indicates that an account has insufficient funds?

Overdrawn Signup and view all the answers

What is the final state of an account that has been closed by the user?

Closed Signup and view all the answers

What happens to an account in the Deleted state?

It can be permanently deleted Signup and view all the answers

What is the possible outcome for an account that remains active for a long time?

It will remain active indefinitely Signup and view all the answers

What is a state in the context of object behavior?

A condition during an object’s life when it satisfies some criterion, performs an action, or waits for an event Signup and view all the answers

What is a transition in the context of object behavior?

The movement of an object from one state to another Signup and view all the answers

What is a state machine in the context of object behavior?

An abstract concept to identify objects behaving like a 'Machine' that can be in one of many finite states Signup and view all the answers

What are the applications of a State Machine Diagram?

All of the above Signup and view all the answers

What does object behavior consist of?

The various states and the movement between these states Signup and view all the answers

What do the states represent in the context of a state machine?

The different combinations of information that an object can hold Signup and view all the answers

What is the primary function of a state machine diagram?

Describing how an object moves through various states within its lifetime Signup and view all the answers

In the context of a state machine, what does a transition represent?

The movement of an object from one state to another Signup and view all the answers

What is the purpose of a state machine in software engineering?

To model the behavior of objects that can exist in multiple states Signup and view all the answers

What is the significance of a state machine diagram in system design?

It helps in visualizing the behavior of objects and their state transitions Signup and view all the answers

What is a pseudostate in a State Machine Diagram?

A starting point in a State Machine Diagram, noted by a black circle Signup and view all the answers

What is the purpose of a guard-condition in a State Machine Diagram?

To test whether a transition can fire Signup and view all the answers

What do concurrent states represent in a State Machine Diagram?

Multiple states that can exist and operate independently at the same time Signup and view all the answers

What are composite states in a State Machine Diagram?

States that contain other states and transitions Signup and view all the answers

What is the role of synchronization bars in a State Machine Diagram?

To show concurrent paths in State Machine Diagrams Signup and view all the answers

What is the origin state in a State Machine Diagram?

The original state of an object before it begins a transition Signup and view all the answers

What are concurrent paths in composite states of a State Machine Diagram?

Independent paths being followed concurrently Signup and view all the answers

What is an action-expression in a State Machine Diagram?

An activity that must be completed as part of a transition Signup and view all the answers

What is the destination state in a State Machine Diagram?

The state to which an object moves after completing a transition Signup and view all the answers

What are the steps involved in creating a State Machine Diagram?

Reviewing the class diagram, identifying status conditions, building diagram fragments, reviewing paths for independent, concurrent paths, and adding transitions with guard conditions and action-expressions Signup and view all the answers

Study Notes

State Machine Diagrams in Software Engineering

State Machine Diagrams show the life of an object in states and transitions
Origin state is the original state of an object before it begins a transition
Destination state is the state to which an object moves after completing a transition
Pseudostate is the starting point in a State Machine Diagram, noted by a black circle
Action-expression is an activity that must be completed as part of a transition
Guard-condition is a true/false test to see whether a transition can fire
Concurrent states in a State Machine Diagram represent multiple states that can exist and operate independently at the same time
Composite states contain other states and transitions
Concurrent paths in composite states are independent paths being followed concurrently
Synchronization bars are often used to show concurrent paths in State Machine Diagrams
Steps for creating a State Machine Diagram include reviewing the class diagram, identifying status conditions, building diagram fragments, reviewing paths for independent, concurrent paths, and adding transitions with guard conditions and action-expressions
State Machine Diagrams can be constructed for specific use cases, such as the "Process Sale" use case which involves states like "Waiting For Sale" and "Entering Items"

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Description

Test your knowledge of State Machine Diagrams in software engineering with this quiz. Learn about origin and destination states, pseudostates, action-expressions, guard-conditions, concurrent and composite states, and the steps for creating a State Machine Diagram. Understand how to construct State Machine Diagrams for specific use cases, such as the "Process Sale" use case.