Reading from files using BufferedReader

BufferedReader stores some characters as it reads into the buffer. This makes the reading faster and hence more efficient. In this recipe, we will understand how to use the BufferedReader to read the contents of a file.

Getting ready

You need to install a preferred development environment that compiles and runs Kotlin. You can also use the command line for this purpose, for which you need the Kotlin compiler installed along with JDK. You can also use IntelliJ IDEA for the development environment.

How to do it…

Follow the mentioned steps to learn more about the working of the BufferedReader class:

1. We can directly attach a BufferedReader to the file and read the contents of the whole file, as in the following code:

import java.io.File
import java.io.InputStream

fun main(args: Array<String>) {
    val inputString = File("lorem.txt").bufferedReader().use { it.readText() }
    println(inputString)
}

2. We can also go line by line on the contents that we need...