Kotlin – Initialize String

To initialize a String variable in Kotlin, we may assign the String literal to the variable without specifying explicit type, or we may declare a variable of type String and assign a String literal later.

The following is a sample code snippet to initialize a variable with a String literal.

var myString = "Hello World"

The following is a sample code snippet to first declare a variable of type String, and then initialize this variable with a String literal.

var myString: String
myString = "Hello World"

Examples

In the following program, we will initialize a variable with a String literal. Since we are initializing the variable with a value, the type of the variable is derived implicitly from the type of value assigned.

Main.kt

fun main(args: Array<String>) {
    var myString = "Hello World!"
    print(myString)
}

Output

Hello World!

Now, let us declare a variable of type String. And then in the next statement, we will initialize a String literal to it.

If we are not initializing the variable during the declaration itself, the type of the variable has to be specified.

Main.kt

fun main(args: Array<String>) {
    var myString: String
    myString = "Hello World"
    print(myString)
}

Output

Hello World!

Conclusion

In this Kotlin Tutorial, we learned how to initialize a String variable in Kotlin.