Top 5 Android Developer Interview Questions for Freshers

Android Developer Interview Questions!

2. What is the primary difference between "val" and "var" in Kotlin and when to use each?

A. In Kotlin, "val" is used for declaring read-only (immutable) variables, while "var" is used for mutable variables. You should use "val" when the value won't change after initialization and "var" when the value can change.

3. What is the significance of the "?" operator in Kotlin, and how does it relate to null safety?

A. The "?" operator in Kotlin is used for handling nullable types. It indicates that a variable can hold a null value. It's essential for ensuring null safety and preventing null pointer exceptions.

4. What is the purpose of Kotlin's "when" expression?

A. The "when" expression in Kotlin is similar to a switch statement in other languages. It allows you to check a value against multiple conditions and execute different code blocks based on the matching condition.

5. Explain the concept of Extension Functions in Kotlin?

A. Extension functions in Kotlin allow you to add new functions to existing classes without modifying their source code. They are useful for extending the functionality of classes, especially when you don't have control over their source code.

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