Google Flutter Basics 3

Question 1

What is the key difference between StatelessWidget and StatefulWidget?

Accepted Answer

StatefulWidget can rebuild with changing data, StatelessWidget cannot

Answer

StatefulWidget holds mutable state and can rebuild, while StatelessWidget is immutable.

Question 2

Which method must be overridden in a StatelessWidget?

Accepted Answer

build()

Answer

A StatelessWidget must implement build() to describe its UI.

Question 3

Which method triggers a UI rebuild after state changes in a StatefulWidget?

Accepted Answer

setState()

Answer

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

Question 4

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

Accepted Answer

initState()

Answer

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

Question 5

Which method should be used to release resources like controllers?

Accepted Answer

dispose()

Answer

dispose() is called when the State is permanently removed, ideal for cleanup.

Google Flutter Practice Test