# What does a state diagram show? ### What does a state diagram show?

A state diagram is used to represent the condition of the system or part of the system at finite instances of time. It's a behavioral diagram and it represents the behavior using finite state transitions. State diagrams are also referred to as State machines and State-chart Diagrams.

### What is action in state chart diagram?

A statechart diagram shows a state machine, which specifies the sequences of states that an object can be in, the events and conditions which cause the object to reach those states, and the actions which take place when those states are reached.

### What are elements of a state in a state diagram?

- Initial State: This state shows the first activity of the flow. - State: A state represents the state of an object at a particular given point of time. - Transition: The transition from one state to another state of objects is represented by an arrow.

### Which is a basic action in state chart diagram?

Statechart diagram describes the flow of control from one state to another state. States are defined as a condition in which an object exists and it changes when some event is triggered. The most important purpose of Statechart diagram is to model lifetime of an object from creation to termination.

### What are state machine diagrams used for?

State machine diagram typically are used to describe state-dependent behavior for an object. An object responds differently to the same event depending on what state it is in.

### What are state diagrams and what are they used for specifically?

Specifically a state diagram describes the behavior of a single object in response to a series of events in a system. Sometimes it's also known as a Harel state chart or a state machine diagram. This UML diagram models the dynamic flow of control from state to state of a particular object within a system.

### What is an action in a state machine?

Action – An executable atomic computation that may directly act on the object that owns the state machine, and indirectly on other objects that are visible to the object, Target state – The state that is active after the completion of the transition.

### What does an action flow represent in an activity diagram?

Action Flow or Control flows – Action flows or Control flows are also referred to as paths and edges. They are used to show the transition from one activity state to another. An activity state can have multiple incoming and outgoing action flows.

### What are the elements of state-transition diagram?

A state-transition diagram includes the following elements: state: represents the value of object attributes at a given time. initial state: represents the state when the system is started. final state: represents the status of system at the end of operation.

### What are the elements of activity diagram?

Basic components of an activity diagram

• Action: A step in the activity wherein the users or software perform a given task. ...
• Decision node: A conditional branch in the flow that is represented by a diamond. ...
• Control flows: Another name for the connectors that show the flow between steps in the diagram.

### How is an activity diagram different from a state diagram?

• Such an Activity Diagram focuses on the flow of data within a system. In State Machines the vertices represent states of an object in a class and edges represent occurrences of events. The additional notations capture how activities are coordinated. Objects have behaviors and states.

### What is the purpose of a state machine diagram?

• State machine diagrams can also show how an entity responds to various events by changing from one state to another. State machine diagram is a UML diagram used to model the dynamic nature of a system.

### What&#39;s the difference between a UML and a state diagram?

• UML State Machine Diagrams (or sometimes referred to as state diagram, state machine or state chart) show the different states of an entity. State machine diagrams can also show how an entity responds to various events by changing from one state to another. State machine diagram is a UML diagram used to model the dynamic nature of a system.

### Which is the first state in a state diagram?

• The initial state of a state machine diagram, known as an initial pseudo-state, is indicated with a solid circle. A transition from this state will show the first real state The final state of a state machine diagram is shown as concentric circles.