Strings

Strings are immutable objects that represent a sequence of characters contained within double quotes ("").

Syntax

val stringName: String = "string value"

In Kotlin, string values are always defined as instances of the String class.

String Templates

Templates can also be used to dynamically produce string values. Dynamic values don’t have to start as strings, and can either be directly referenced with a dollar sign ($) or evaluated as a string with additional curly braces ({}).

Example

The following example showcases the various ways strings are used in Kotlin:

fun main(args: Array<String>) {
  // String literals
  val greeting: String = "Hello, World!"
  println(greeting)

  // String templates
  val dynamicValue = 4
  val stringOne: String = "The value of dynamicValue is $dynamicValue"
  System.out.println(stringOne)

  val a = dynamicValue
  val b = 5
  val stringTwo: String = "The sum of a and b is ${a + b}"
  System.out.println(stringTwo)
}

The output for the above code will be:

Hello, World!
The value of dynamicValue is 4
The sum of a and b is 9

String Methods

The following methods are convenient tools for handling a range of string related operations.