1. Introduction

In Java, there may be scenarios where you need to convert a List of elements into a Comma Separated Values (CSV) format. This is a common format for storing tabular data and can be easily imported into spreadsheet applications like Microsoft Excel or Google Sheets. In this post, we’ll explore how to convert a List of strings into a CSV String in Java.

2. Program Steps

1. Create and initialize a List of Strings.

2. Use the String.join() method to join the elements of the List, separated by commas.

3. Print the resulting CSV String to the console.

3. Code Program

import java.util.Arrays;
import java.util.List;

public class ListToCSV {

    public static void main(String[] args) {

        // Step 1: Create and initialize a List of Strings
        List<String> fruits = Arrays.asList("Apple", "Banana", "Cherry");

        // Step 2: Use the String.join() method to join the elements of the List into a CSV String
        String csvString = String.join(",", fruits);

        // Step 3: Print the resulting CSV String to the console
        System.out.println(csvString);
    }
}

Output:

Apple,Banana,Cherry

4. Step By Step Explanation

Step 1: We start by creating and initializing a List of Strings called fruits, which contains the elements "Apple", "Banana", and "Cherry".

Step 2: The String.join() method is used to concatenate the elements of the fruits List into a single String, separated by commas, resulting in a CSV String stored in the variable csvString.

Step 3: Finally, we print the csvString to the console, which outputs: Apple,Banana,Cherry.

The String.join() method makes it concise and easy to convert a List of Strings into a CSV String in Java.