How to sort the lines in a file in Kotlin

How to sort the lines in a file in Kotlin.

Here's a step-by-step tutorial on how to sort the lines in a file using Kotlin:

Read the file: To begin, you need to read the contents of the file into your Kotlin program. You can use the File class from the java.io package to accomplish this. Here's an example of how to read the file:
```
val file = File("path/to/file.txt")
val lines = file.readLines()
```
In this example, replace "path/to/file.txt" with the actual path to your file.
Sort the lines: Once you have the lines of the file in a list, you can sort them using the sorted function. This function will return a new list with the lines sorted in ascending order. Here's an example:
```
val sortedLines = lines.sorted()
```
After executing this code, sortedLines will contain the lines of the file sorted in alphabetical order.
Write the sorted lines back to the file: Finally, you can write the sorted lines back to the file. You can use the writeText function of the File class to accomplish this. Here's an example:
```
file.writeText(sortedLines.joinToString("\n"))
```
In this example, joinToString("\n") is used to concatenate the lines of the sortedLines list into a single string, with each line separated by a newline character (\n).
After executing this code, the file will contain the sorted lines.

And that's it! You've successfully sorted the lines in a file using Kotlin. Here's the complete code:

import java.io.File

fun main() {
    val file = File("path/to/file.txt")
    val lines = file.readLines()
    val sortedLines = lines.sorted()
    file.writeText(sortedLines.joinToString("\n"))
}

Remember to replace "path/to/file.txt" with the actual path to your file.