CODEWITHSUNDEEP
androidkotlin
Johannes M
Johannes M

Reputation: 65

Unresolved reference:toUpperCase Kotlin

Im currently developing Kotlin in Android Studio 3.1 out of an JsonReader I receive an String!, which I'm trying to convert to upper case so what i do is:

var name=reader.nextString().toUpperCase()

the problem is, that the toUpperCase is not detected and is marked as unresolved reference

Upvotes: 2

Views: 7770

Answers (2)

shariful hasnine
shariful hasnine

Reputation: 3365

capitalize Function can do the same as toUpperCase.

fun String.capitalize(): String

Returns a copy of this string having its first letter uppercased, or the original string, if it's empty or already starts with an upper case letter.

println("abcd".capitalize()) // Abcd
println("Abcd".capitalize()) // Abcd

For more details read the documentation.

Upvotes: -3

tynn
tynn

Reputation: 39863

The toUpperCase() method is defined as an inline extension function to String not as a java.lang.String. Thus you need to have the Kotlin standard library as your dependency to use this method for String.

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

Upvotes: 5

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