https://grokonez.com/kotlin/kotlin-convert-string-long
Kotlin Convert String to Long
In the tutorial, JavaSampleApproach will guide you how to convert Kotlin String to Long.
Related posts:
Working environment:
- Java 8
- Kotlin 1.1.61
I. Kotlin toLong() method
1 String.toLong(): Long
- use method signature:
public inline fun String.toLong(): Long
package com.javasampleapproach.string2long
fun main(args : Array<String>) {
// use method:
// -> public inline fun String.toLong(): Long = java.lang.Long.parseLong(this)
val number: Long = "123".toLong();
println(number) // 123
// if the string is not a valid representation of a number
// -> throw NumberFormatException
try{
"12w".toLong();
}catch(e: NumberFormatException){
println(e.printStackTrace())
// -> print on console:
/*
java.lang.NumberFormatException: For input string: "12w"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Long.parseLong(Long.java:589)
at java.lang.Long.parseLong(Long.java:631)
at com.javasampleapproach.string2long.ConvertString2LongKt.main(ConvertString2Long.kt:12)
*/
}
}
-
Strig.toLong()
will throw a NumberFormatException if the string is not a valid representation of a number. -
String.toLong()
just usesInteger.parseLong
of Java for converting -> detail:public inline fun String.toLong(): Long = java.lang.Long.parseLong(this)
2 String.toLong(radix: Int): Long
If we want to work with radix, we can use another method signature toLong(radix: Int)
-> detail: public inline fun String.toLong(radix: Int): Long = java.lang.Long.parseLong(this, checkRadix(radix))
More at:
https://grokonez.com/kotlin/kotlin-convert-string-long
Kotlin Convert String to Long
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