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How to convert String to Long in Kotlin?
In this article, we will see how to convert a String to Long in Kotlin using a library function. There are multiple ways to do it. Let's take a couple of examples to demonstrate how it's done.
Example - using toLong()
toLong() is a function that provides the most convenient way to convert a string to a long. In the following example, we will see how we can use toLong() to convert our String.
fun convertToLong(s: String) {
try {
val value = s.toLong()
println("The Long value is: $value")
}
catch (ex: NumberFormatException) {
println("Please enter a number: ")
}
}
fun main() {
val str = "1234567890"
convertToLong(str)
}Output
Once the above piece of code is executed, it will convert our String "1234567890" to a Long value.
The Long value is: 1234567890
Example - using toLongOrNull()
Like toLong(), we can use another function called toLongOrNull() to convert a String value to Long. In the following example, we will see how to convert a String to Long using toLongOrNull().
fun convertToLong(s: String) {
try {
val value = s.toLongOrNull()
println("The Long value is: $value")
}
catch (ex: NumberFormatException) {
println("Please enter a number: ")
}
}
fun main() {
val str = "1234567890"
convertToLong(str)
}Output
Once the above piece of code is executed, it will convert our String "1234567890" to a Long value.
The Long value is: 1234567890
Example - java.lang.Long.valueOf()
Kotlin is based on the JVM. Hence, we can use the Java Lang package to convert a String to a Long variable. In the following example, we have used the valueOf() function to convert a String to a Long variable.
fun main() {
val str = "12345678"
println("The given string is: " +str)
val value = java.lang.Long.valueOf(str)
println("After converting to Long: " +value)
}Output
One executed, the above piece of code will convert our String "1234567890" to a Long value.
The given string is: 12345678 After converting to Long: 12345678
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