How to read and write files in Kotlin in 2024?

To read and write files in Kotlin without list items, you can use the File class from the java.io package. Here's an example of reading and writing text/code files without list items:

Reading a File:

import java.io.File

fun main() {
    val fileName = "myfile.txt" // the name of the file you want to read
    val file = File(fileName)

    if (file.exists()) {
        val contents = file.readText()
        println(contents)
    } else {
        println("File does not exist!")
    }
}

In this example, we use the readText() function from the File class to read the contents of the file. If the file exists, it will print the contents; otherwise, it will display an error message.

Writing a File:

import java.io.File

fun main() {
    val fileName = "myfile.txt" // the name of the file you want to write
    val contents = "This is the content to be written into the file."

    val file = File(fileName)
    file.writeText(contents)

    println("File written successfully!")
}

In this example, we use the writeText() function from the File class to write the contents to the file. It will create a new file if it doesn't exist or overwrite the file if it already exists. The message "File written successfully!" is printed after the file is written.

Make sure to provide the appropriate file name with extension (e.g., "myfile.txt") and modify the contents variable with the desired text/code to be written.

How to read a text file line by line in Kotlin?

You can read a text file line by line in Kotlin using the readLines() function. Here's an example:

import java.io.File

fun main() {
    val fileName = "example.txt"
    val file = File(fileName)

    file.useLines { lines ->
        lines.forEach { line ->
            // Process each line here
            println(line)
        }
    }
}

In this example, we first create a File object representing the text file we want to read. Then, we use the useLines() function on the file object, which automatically closes the reader after processing the lines. Inside the lambda function, we can access each line of the file and process it as needed. In this case, we are simply printing each line to the console.

Make sure to replace "example.txt" with the actual file name or path to your text file.

How to write data to a file in Kotlin?

To write data to a file in Kotlin, you can follow these steps:

Open or create a file: val file = File("") file.createNewFile()
Create a FileWriter object to write to the file: val writer = FileWriter(file)
Write data to the file using the writer: writer.write("")
Close the writer to ensure all data is written to the file: writer.close()

Here is an example of writing data to a file named "example.txt":

import java.io.File
import java.io.FileWriter

fun main() {
    val file = File("example.txt")
    file.createNewFile()

    val writer = FileWriter(file)
    writer.write("Hello, World!")
    writer.close()
}

Make sure to replace "<file_path>" with the actual path of the file you want to write to, and "<data_to_write>" with the actual data you want to write.

How to handle file exceptions in Kotlin?

To handle file exceptions in Kotlin, you can use the try-catch-finally construct. Here is an example of how to handle file exceptions:

import java.io.File
import java.io.FileNotFoundException
import java.io.IOException

fun main() {
    val fileName = "file.txt"
    try {
        // Code that may throw file-related exceptions
        readFile(fileName)
    } catch (e: FileNotFoundException) {
        // Exception handling for file not found
        println("File not found: $fileName")
    } catch (e: IOException) {
        // Exception handling for general IO errors
        println("Error reading file: $fileName")
    } finally {
        // Code that will always execute regardless of exceptions
        println("End of program")
    }
}

fun readFile(fileName: String) {
    val file = File(fileName)
    val content = file.readText()
    println(content)
}

In this example, we have a readFile function that reads the content of a file. The main function calls this function and wraps it in a try-catch block. The catch block catches specific exceptions such as FileNotFoundException and IOException, and handles them accordingly. The finally block is executed regardless of whether an exception occurs or not.

You can customize the exception handling and error messages according to your requirements.

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