How to append text to an existing file in Kotlin

How to append text to an existing file in Kotlin.

Here is a step-by-step tutorial on how to append text to an existing file in Kotlin:

1. Import the necessary classes:

   import java.io.FileWriter
   import java.io.BufferedWriter
   import java.io.IOException

2. Create a function to append text to a file:

   fun appendToFile(fileName: String, text: String) {
       try {
           val fileWriter = FileWriter(fileName, true)
           val bufferedWriter = BufferedWriter(fileWriter)
           bufferedWriter.append(text)
           bufferedWriter.close()
       } catch (e: IOException) {
           e.printStackTrace()
       }
   }

3. Call the function and pass the file name and text to append:

   val fileName = "example.txt"
   val textToAppend = "This is the text to append."
   appendToFile(fileName, textToAppend)

4. Explanation:

   • In step 1, we import the necessary classes for file handling in Kotlin.
   • In step 2, we define a function called appendToFile that takes the file name and text to append as parameters.
   • Inside the function, we create a FileWriter object by passing the file name and true as the second parameter, which indicates that we want to append to the file instead of overwriting it.
   • We then create a BufferedWriter object using the FileWriter object.
   • We call the append function on the BufferedWriter object and pass the text to append.
   • Finally, we close the BufferedWriter to ensure that all the data is written to the file.
   • If any exception occurs during the file handling process, we catch it and print the stack trace in the catch block.
   • In step 3, we call the appendToFile function and pass the file name and text to append as arguments.
   • You can change the file name and the text to append according to your requirements.

5. Additional Notes:

   • Make sure to handle exceptions appropriately in your code.
   • Ensure that you have the necessary write permissions for the file you want to append to.
   • If the file does not exist, it will be created automatically.

That's it! You have learned how to append text to an existing file in Kotlin.