Top 25 Kotlin Interview Questions and Answers

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6) What does ‘Null Safety’ mean in Kotlin? 
Null Safety feature allows removing the risk of occurrence of NullPointerException in real time. It
is also possible to differentiate between nullable references and non-nullable references.
7) Why is Kotlin interoperable with Java?
Kotlin is interoperable with Java because it uses JVM bytecode. Compiling it directly to
bytecode helps to achieve faster compile time and makes no difference between Java and
Kotlin for JVM.
8) Is there any Ternary Conditional Operator in Kotlin like in Java?
No there is no ternary conditional operator in Kotlin language.
9) How can you declare a variable in Kotlin?
value my_var: Char
10) How many constructors are available in Kotlin?
Two types of constructors available in Kotlin are:
1. Primary constructor
2. Secondary constructor
11) Can you tell me what kinds of programming types does Kotlin support?
1. Procedural Programming
2. OOPS
12) Give me name of the extension methods Kotlin provides to java.io.File
bufferedReader(): Use for reading contents of a file into BufferedReader
readBytes() : Use for reading contents of file to ByteArray
readText(): Use of reading contents of file to a single String
forEachLine() : Use for reading a file line by line in Kotlin
readLines(): Use to reading lines in file to List
13) How can you handle null exceptions in Kotlin?
Elvis Operator is used for handling null expectations in Kotlin.
14) What are some of the features which are there in Kotlin but not In Java?
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Here, are few important Kotlin features that Java doesn’t have:
1. Null Safety
2. Operator Overloading
3. Coroutines
4. Range expressions
5. Smart casts
6. Companion Objects