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Kotlin is a modern, statically typed language. Having been developed by JetBrains, it targets the JVM, among other platforms.
- Concise Syntax: Kotlin's compact code minimizes boilerplate.
- Null Safety: With its nullable types, Kotlin helps reduce null-pointer exceptions.
- Extension Functions: These functions simplify class extension.
- Coroutines: Kotlin's lightweight threads make asynchronous operations more manageable.
- Immutability: Kotlin has built-in support for immutable structures through 'val'.
Kotlin can use Java Frameworks and libraries. Plus, it offers mechanisms for both Java-to-Kotlin and Kotlin-to-Java interoperability.
These mechanisms include:
- Kotlin Libraries and Frameworks: They are tested to work with Java.
- nullability Roadmap and @Nullable/@NotNull Annotations: One can take advantage of both Kotlin's null-safe types and Java's nullability guidelines.
- Supportive Native Tools: Kotlin paves the way for Android development with libraries compatible with Java.
- Instrumented and Standard Libraries: Both libraries have Kotlin origin. It offers the convenience of unifying coding styles and tools. The 'kotlin.jvm' package is tailored for standard Java operations.
-
Migrating Codebases: Gradual transitions are possible. Both languages can interoperate within a single project.
-
Collaborative Development: Team members who prefer different languages can still contribute to the common codebase.
-
Libraries and Frameworks: Leveraging Java libraries in a Kotlin-based system is seamless.
-
Android Development: Kotlin has been officially backed by Google as a primary language for Android app development.
-
VM and Platform Independence: Kotlin's multi-platform capabilities allow functionality sharing across different platforms.
Here is the Java class:
public class Fruit {
private String name;
private int quantity;
public Fruit(String name, int quantity) {
this.name = name;
this.quantity = quantity;
}
public String getName() {
return name;
}
public int getQuantity() {
return quantity;
}
public void setName(String name) {
this.name = name;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
}
And here is the Kotlin class that uses the Fruit
Java class:
fun main() {
val apple = Fruit("Apple", 10) // Use of Java class
println("Name: ${apple.name}, Quantity: ${apple.quantity}")
apple.name = "Green Apple" // Kotlin syntax for modifying Java object
apple.quantity += 5
println("Updated Apple: Name - ${apple.name}, Quantity - ${apple.quantity}")
}
Kotlin, a statically-typed language, provides several benefits over Java in the context of Android development.
- Intuitive Syntax: Kotlin reduces boilerplate code, leading to more elegant, succinct, and readable codebases.
- Extension Functions: This language feature allows developers to extend specific types with new functionalities.
- Null Safety: The type system in Kotlin differentiates between nullable and non-nullable references, effectively reducing
NullPointerException
occurrences. - Smart Casting: The language's type inference allows automatic casting of types wherever possible, thereby eliminating the need for explicit casting.
- Coroutines: Kotlin's built-in support for coroutines makes asynchronous programming simpler and less error-prone.
- Lambdas: Kotlin's support for concise yet powerful lambda expressions outstrips that of Java.
- Data Classes: These classes, which Kotlin can generate getters, setters,
equals()
, and other basic methods automatically make working with models more streamlined. - Type Inference: The language can often discern the type of a variable from its value, thus alleviating the need for explicit type declarations.
- Interoperability with Java: Kotlin integrates seamlessly with existing Java code, allowing for easy migration and coexistence.
- Full Java SDK Support: Kotlin is fully compatible with the Java SDK, enabling access to the plethora of Java libraries from Kotlin projects.
- Immutability by Default: In Kotlin, variables are, by default, immutable (read-only). This approach is conducive to preventing bugs and improving code safety.
- Parameterized Contracts: The
where
clause in Kotlin ensures more robust compile-time checks for generic types. - Range and Step Constructs: These features enhance data accuracy and prevent out-of-bounds access.
Kotlin has a rich set of built-in data types tailored for various uses. They are mostly categorized into Primitive and Object data types.
Kotlin introduces the following Primitive types:
Double
: Double precision 64-bit floating point number.Float
: Single precision 32-bit floating point number.Long
: 64-bit integer.Int
: 32-bit integer.Short
: 16-bit integer.Byte
: 8-bit integer.Char
: A single 16-bit Unicode character.Boolean
: Represents truth values: true or false.
These are Object types:
String
: A sequence of characters.Any
: The root of the Kotlin class hierarchy. This is the equivalent ofObject
in Java.
Array
: A class for array types.Function
: A function type, which is determined by its parameter types and return type.
You can have a look at the Kotlin code.
Here is the Kotlin code:
fun main() {
val doubleNum: Double = 100.0
val floatNum: Float = 100.0f
val longNum: Long = 100
val intNum: Int = 100
val shortNum: Short = 100
val byteNum: Byte = 100
val charLetter: Char = 'A'
val isRainingToday: Boolean = true
val text: String = "Hello, Kotlin!"
val anyValue: Any = "This is an example of Any type in Kotlin"
val intArray: Array<Int> = arrayOf(1, 2, 3, 4, 5)
val strArray: Array<String> = Array(5) { "Item #$it" }
fun myFunction(num: Int): Boolean {
return num % 2 == 0
}
val myFunctionType: (Int) -> Boolean = ::myFunction
}
In Kotlin, the keywords val
and var
are used for variable declaration, each with distinct mutability characteristics.
val
, akin to final
in Java, denotes an immutable reference. This means after its initial assignment, the reference doesn't change. However, the state of the object or type it points to can still be altered.
var
designates a mutable reference. This type of variable allows both reassignment and potential state changes during its lifecycle.
-
Prefer
val
: Use it unless there's a compelling reason for mutability. This practice aligns with Kotlin's design for immutability. -
Mutable Limited: In production code, restrict mutability with
var
to situations where its necessity is clear and justified.
Here is the Kotlin code:
fun main() {
val PI = 3.14159 // Immutable PI, defined with val
var count = 0 // Mutable count, defined with var
// Following lines lead to compiler errors
PI = 3.14 // Cannot reassign PI as it's declared with val, not var
count = 1 // OK! Reassignment of a variable defined with var is allowed
}
In Kotlin, defining a singleton is straightfoward; the language provides a dedicated object
keyword.
When you declare a companion object in a class, it becomes a singleton accessible through the class name. This is useful for creating global handles.
- Kotlin Code:
object MySingleton {
fun someFunction() {
// Logic here
}
}
-
Access:
MySingleton.someFunction()
-
Kotlin Code:
class MySingletonClass { companion object { fun someFunction() { // Logic here } } }
-
Access:
MySingletonClass.someFunction()
If a class doesn't require an instance or has a single instance throughout the application, object
is the most succinct and expressive solution.
In contrast, companion object
is suitable when non-static methods or properties need to interact with the singleton. It's pertinent to classes you instatiate but have a single instance for per application.
Kotlin's object
offers several advantages over traditional singletons, including automatic management of thread safety, lazy initialization, and streamlined syntax. It's a recommended approach for modern Kotlin development.
Traditional Java singletons also had complications with lazy initialization and thread safety, which are non-issues with Kotlin's object
.
From a design standpoint, the single-responsibility principle should guide the decision to use singletons. Cohesiveness allows for consistency and predictability across the app.
- Kotlin's
object
keyword is the most straightforward way to create singletons. companion object
is appropriate for singletons tied to the containing class where both need to be instantiated.- Kotlin's
object
is a modern, expressive alternative to the verbosity and potential issues of traditional Java singletons. - Threading and resource management are handled seamlessly, simplifying code.
Kotlin type inference represents a powerful feature that automatically determines variable types. Nonetheless, it does so within the constraints of Kotlin's Type Hierarchy.
- Kotlin types are static, meaning they're determined at compile time.
- The Kotlin compiler analyses assignments and method calls to infer types.
- When there are multiple possible types, the compiler selects the most specific one. In case of ambiguity, the code will not compile, and a type annotation is needed to provide clarity.
Kotlin also supports type inference with:
- Lambda expressions
- Generics
The Kotlin compiler uses both the expected type and the inferred type of the arguments to infer the type of both return value and the arguments of the run
and 'let' extension function.
In Kotlin, you can use it
as shorthand for a single lambda parameter. Type inference deduces the type based on the context in which the lambda is used.
The list
argument is expected to be a list of strings, allowing it
to be inferred as a String
. Consequently, the type of length
is inferred as Int
.
Here is the Kotlin code:
fun main() {
val names = listOf("Alice", "Bob")
// Infers `it` as String
val lengths: List<Int> = names.map { it.length }
println(lengths) // Output: [5, 3]
}
While it is essential to have a main
function to initiate an application in most programming languages, Kotlin offers the flexibility to apply direct execution to standalone code.
The directive to execute code without a main
function is termed script mode and is enabled using the following steps:
- Define a build and execution environment through the Kotlin compiler or the IntelliJ IDEA.
- Ensure that the script file has .kts or kotlin-script extension to indicate it's a Kotlin script.
This adaptation simplifies rapid prototyping and facilitates learning and testing in sandbox environments. Nonetheless, it's important to note that traditional Java applications, as well as Android applications, still necessitate a main
function.
While some languages use "void" to indicate functions or expressions with no useful return value, Kotlin leverages the Unit type.
The driving principle behind introducing the Unit
type was to provide a unified approach to functions across the object-oriented and functional programming paradigms.
- Singleton Element:
Unit
is a singleton, meaning there's only one instance of it. This allows functions with no explicit return to be understood as returning a single, distinct value. - Immutable State: As a singleton,
Unit
is inherently immutable, ensuring that every function call returningUnit
produces the same fixed value.
- Functionality Communication:
Unit
serves as a clear signal that a function is invoked strictly for its side effects. - Interface Alignment: Codebases aiming for consistency can utilize
Unit
to harmonize function return types.
Here is the Kotlin code:
// Function with explicit Unit return type
fun greet(name: String): Unit {
println("Hello, $name!")
}
// Function without explicit return type defaults to Unit
fun performTask(): Unit {
// Task logic goes here
}
// Function with no explicit return type
fun noReturn(): Nothing? {
// Code that will never execute
throw NotImplementedError()
}
fun main() {
// All three function calls here can be understood as returning Unit
greet("Alice")
performTask()
println(noReturn()) // Will not print anything
}
In this code, greet("Alice")
, performTask()
, and println(noReturn())
are all implicitly equated to Unit
return types. The "MessageBox" would close after 12 seconds without the output.
In Kotlin, you can interpolate strings using the $
symbol. This mechanism allows for the direct embedding of variables, expressions, and Math operations within a string.
Alternatively, you can leverage raw strings with the trimMargin
method for multi-line text.
Here is the Kotlin code:
fun main() {
val name = "Alice"
val age = 25
println("Name: $name, Age: $age")
// Dollar sign within a string
println("$$100: A Hundred Dollars")
// Interpolated expression
val tripleAge = age * 3
println("In 3 years, $name will be ${age + 3} years old, and 3 times $age is $tripleAge")
// Raw string with trimMargin
val poem = """
|Two roads diverged in a yellow wood,
|And sorry I could not travel both
|And be one traveler
""".trimMargin()
println(poem)
}
Name: Alice, Age: 25
$100: A Hundred Dollars
In 3 years, Alice will be 28 years old, and 3 times 25 is 75
Two roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveler
Kotlin's extension functions provide a convenient mechanism for adding methods to existing classes without altering their source code. This is especially useful for extending classes that are otherwise fixed or derive from external libraries, such as built-in types from Java.
-
Improved Readability: Extension functions enable adding context-specific methods to types.
-
Consistent Naming: These functions ensure a standard naming convention for classes.
-
No Inheritance Issues: Overriding is not a concern, making extension functions ideal for providing custom behavior to existing classes.
-
Modular Code: Associates utility methods directly with the classes they operate on, streamlining code organization.
In Kotlin, the term "function" typically refers to a top-level function, whereas the term "method" is used within the context of a class.
-
Importing Extension Functions: Kotlin's standard library provides numerous extension functions. Additional extensions can be imported using the
import
directive. -
Working with Nullable Types: Extension functions can be applied to nullable types to avoid invoking methods on
null
. By checking fornull
within the function, it ensures safe execution. -
Scoping: Although extension functions resemble regular methods, their scoping is limited to the file where they are defined unless they are imported or are part of the same package.
-
Inheritance: When a class and its parent provide methods of the same name and signature, the class's own methods always take precedence.
However, even when an extension function exists, classes and their derived types (e.g., subclasses) can override the functionality by defining methods with the same signature.
Here is the Kotlin code:
fun String?.isNullEmptyOrBlank(): Boolean {
return this == null || this.isEmpty() || this.isBlank()
}
fun main() {
val text: String? = "Hello"
val emptyText: String? = ""
val blankText: String? = " "
println(text.isNullEmptyOrBlank()) // false
println(emptyText.isNullEmptyOrBlank()) // true
println(blankText.isNullEmptyOrBlank()) // true
}
In this example, String?
is a nullable type, and the extension function isNullEmptyOrBlank
checks for null
, an empty string, or a string consisting entirely of whitespace.
While both Kotlin and Java use if
expressions to conditionally execute code, Kotlin offers more power and flexibility with its if
expression.
-
Return Type: In Java, you can only use
if
to conditionally execute statements. In contrast, Kotlin'sif
can also return a value, similar to the Ternary Operator in Java. -
Immutability: Kotlin's
if
is an expression that produces a value, and that value is immutable once assigned. However, in Java, variables assigned within eachif
block can have different values outside the block. -
When to Use: In Kotlin, the standard recommendation is to use
if
for simple or limited cases and usewhen
for more complex and multifaceted scenarios.
Here is the Kotlin code:
val result = if (condition) "Value1" else "Value2"
And here is the equivalent Java code:
String result;
if (condition) {
result = "Value1";
} else {
result = "Value2";
}
-
Kotlin Compactness: Utilize Kotlin's concise syntax for improved readability and maintainability.
-
Type Inference: In Kotlin, you may let the compiler infer the result type rather than explicitly defining it.
In Kotlin, the when
expression is a powerful control-flow construct that simplifies and enhances many operations.
It combines the best aspects of conditional execution and pattern matching from other languages like Java, C++, and Scala. This dynamic construct allows for complex evaluations in a concise, easy-to-read structure.
- Branching: Similar to
switch
statements,when
evaluates different conditions and triggers corresponding code blocks. - Expression-based: It works well in both code blocks and as standalone expressions.
- Versatile Syntax: It supports a broad range of matching techniques, such as value matching, range checks, and null safety operators.
- Extensive Filtering: Can evaluate conditions like type checks, boolean expressions, and custom checks.
- Sealed Classes Support: Seamlessly integrates with sealed classes, enforcing a comprehensive check of all possible subtypes.
Here is the Kotlin code:
fun describe(object: Any): String {
return when (object) {
1 -> "One"
2 -> "Two"
3, 4 -> "Three or Four"
is String -> "That's a string"
is Number -> "That's a number"
else -> "Something else"
}
}
fun main() {
println(describe(1))
println(describe(3))
println(describe(5))
println(describe("hello"))
}
When you run the above code, you will get the following output:
One
Three or Four
Something else
That's a string
Here is the Kotlin code:
fun isStringOrEmpty(input: Any?): Boolean {
return when (input) {
null -> true
is String -> input.isEmpty()
else -> false
}
}
fun main() {
println(isStringOrEmpty(null))
println(isStringOrEmpty(""))
println(isStringOrEmpty(123))
}
When you run the above code, you will get the following output:
true
true
false
Here is the Kotlin code:
data class Person(val name: String, val age: Int, val email: String = "")
fun processPerson(person: Person) {
when {
person.age < 0 -> println("Invalid age!")
person.name.isBlank() -> println("No name provided")
person.email.isBlank() -> println("No email provided")
else -> {
println("All details provided:")
println("Name: ${person.name}")
println("Age: ${person.age}")
println("Email: ${person.email}")
}
}
}
fun main() {
val person1 = Person("Alice", 25, "[email protected]")
val person2 = Person("Bob", 30)
val person3 = Person("", -10, "invalidemail")
processPerson(person1) // Should print all details
processPerson(person2) // Should print "No email provided"
processPerson(person3) // Should print "Invalid age!"
}
- We define a data class,
Person
. - The
when
block operates without an explicitly defined expression (commonly referred to as a "subject"). This feature allows for more intricate conditions and is known as a "subject-lesswhen
."
In Kotlin, null safety is a core feature designed to address the issues around null references. It aims to reduce NullPointerException
errors that are commonly encountered in other languages, particularly Java.
The Elvis Operator provides a concise means for handling null
values within expressions.
Kotlin employs a set of rules to manage nullability in objects:
-
A type is marked as nullable if it can accept
null
values. This is indicated by appending?
to the type name.val name: String? = null // Nullable String
-
If the
name
variable was not marked as nullable (e.g.,val name: String = null
), and you attempted to assignnull
, the Kotlin compiler wouldn't allow it.
-
To invoke a method or access a property on a nullable object, use the safe call operator
?.
. The method is called only if the object isn'tnull
:val length: Int? = name?.length // null if name is null
-
When you're certain an object isn't
null
, you can use the not-null assertion operator!!
.Be cautious with this operator. If the object turns out to be
null
, it will result in aNullPointerException
.val l: Int = name!!.length // Throws NPE if name is null
-
For type checks, Kotlin offers both the straightforward
is
operator and the safe castas?
. This safely casts an object to a type, returningnull
if the cast fails.val cat: Cat? = animal as? Cat // null if animal isn't Cat
The Elvis operator prompts Kotlin to return a non-null value or a default or alternative value if the operating object is null.
-
It's presented as a double dot
?:
. -
The value on the left of the
?:
will be returned if it's notnull
. Otherwise, the value on the right will be the result:val length: Int = name?.length ?: -1 // If name is null, length is -1
Replace null values with appropriate defaults, simplifying code and handling absence scenarios.
In Kotlin, a smart cast refers to the compiler's ability to automatically cast a variable under certain conditions. This feature significantly reduces code verbosity and casting overhead, ensuring code safety.
The smart cast is automatically applied after the compiler identifies a segment of code where a certain type check has been completed.
For example, consider the following code snippet:
fun processStringOrInt(obj: Any) {
if (obj is String) {
// here, `obj` is smart-cast to a `String`
println(obj.length)
} else if (obj is Int) {
// here, `obj` is smart-cast to an `Int`
println(obj - 1)
}
}
- Within the
if
andelse if
blocks, smart casts are triggered. After these checks, the compiler automatically adjusts the type ofobj
for that code block. - This mechanism eliminates the need for developers to manually cast
obj
within each conditional branch.
- Complexity: While simple checks like type and
null
are direct matches, more complex contexts, such as generics, may not trigger smart casts in Kotlin. - Return Type Ambiguity: In functions using smart casts, the return type can become ambiguous. If one branch of the condition returns a particular type, the compiler may not know for certain that the other branch never returns that type. This ambiguity can lead to compile-time errors.
- Capture Scope: Avoid modifying variables within the smart-cast-conditional blocks. Such modifications can disrupt the typing and lead to unexpected behaviors.
- Code Conciseness: Smart casts reduce the need for explicit type checks and casts, leading to cleaner and more readable code.
- Error Prevention: Smart casts help in avoiding potential errors related to type mismatches and nullability. Once a type is checked, the variable is guaranteed to be of that type within the corresponding code block.
In Kotlin, you can customize property behaviors, including defining your own custom getters and setters.
Here is the syntax:
var <propertyName>[: <PropertyType>] [= <property_initializer>]
get() = <custom_getter>
set(value) { <custom_setter> }
Let's take a look at the code:
Here is the Kotlin code:
class Temperature {
var celsius: Float = 0f
get() {
return (field * 9 / 5) + 32
}
set(value) {
field = (value - 32) * 5 / 9
}
val fahrenheit: Float
get() = celsius
}
Here is Java code:
public class Main {
public static void main(String[] args) {
Temperature weather = new Temperature();
weather.setCelsius(20);
System.out.println("Temperature in Fahrenheit: " + weather.getFahrenheit());
}
}