Exceptions

Catching exception with try-catch-finally

Catching exceptions in Kotlin looks very similar to Java

try {
    doSomething()
}
catch(e: MyException) {
    handle(e)
}
finally {
    cleanup()
}

You can also catch multiple exceptions

try {
    doSomething()
}
catch(e: FileSystemException) {
    handle(e)
}
catch(e: NetworkException) {
    handle(e)
}
catch(e: MemoryException) {
    handle(e)
}
finally {
    cleanup()
}

try is also an expression and may return value

val s: String? = try { getString() } catch (e: Exception) { null }

Kotlin doesn’t have checked exceptions, so you don’t have to catch any exceptions.

fun fileToString(file: File) : String {
    //readAllBytes throws IOException, but we can omit catching it
    fileContent = Files.readAllBytes(file)
    return String(fileContent)
}