Google Flutter App Development 3

Question 1

What is the key difference between StatelessWidget and StatefulWidget?

Accepted Answer

StatefulWidget can rebuild when its mutable state changes

Answer

StatefulWidget holds mutable state and rebuilds via setState, while StatelessWidget is immutable.

Question 2

Which method triggers a rebuild after changing state in a StatefulWidget?

Accepted Answer

setState()

Answer

Calling setState() marks the widget dirty and schedules a rebuild.

Question 3

Where should you typically dispose of controllers like AnimationController?

Accepted Answer

In the dispose() method of the State

Answer

dispose() releases resources when the State object is permanently removed.

Question 4

Which lifecycle method runs once when a State object is first created?

Accepted Answer

initState()

Answer

initState() is called once when the State is inserted into the tree.

Question 5

What is a BuildContext primarily used for?

Accepted Answer

Locating a widget's position in the tree to access inherited widgets

Answer

BuildContext represents a widget's location in the tree and is used to look up ancestors like Theme or Navigator.

Google Flutter Practice Test