Pluralsight Product Owner Interview Questions and Answers

Android life cycle refers to the stages a mobile app goes through from creation to termination.

• Android app starts in onCreate() method

• Moves to onStart() and onResume() when app becomes visible

• Goes to onPause() when app is partially visible

• Enters onStop() when app is no longer visible

• Finally reaches onDestroy() when app is terminated

Singleton design pattern ensures a class has only one instance and provides a global point of access to it.

• Used when only one instance of a class is needed throughout the system

• Provides a global access point to the instance

• Implemented by creating a static method to return the same instance each time it is called

HashMap is not thread-safe, while ConcurrentHashMap allows multiple threads to read and write concurrently.

• HashMap is not synchronized and not thread-safe, while ConcurrentHashMap is synchronized and thread-safe.

• ConcurrentHashMap allows multiple threads to read and write concurrently without any external synchronization, while HashMap requires external synchronization for concurrent access.

• ConcurrentHashMap achieves hi...read more

List is an ordered collection of elements with duplicates allowed, while set is an unordered collection of unique elements.

• List maintains the order of elements, while set does not guarantee any specific order.

• List allows duplicate elements, while set does not allow duplicates.

• Example: List - [1, 2, 3, 1], Set - {1, 2, 3}