Convert String into comma separated List in Java

Convert String into comma separated List in Java

Last Updated : 11 Dec, 2018

Given a String, the task is to convert it into comma separated List. Examples:

Input: String = "Geeks For Geeks"
Output: List = [Geeks, For, Geeks]

Input: String = "G e e k s"
Output: List = [G, e, e, k, s]

Approach: This can be achieved by converting the String into String Array, and then creating an List from that array. However this List can be of 2 types based on their method of creation - modifiable, and unmodifiable.

Creating an unmodifiable List:

Java

// Java program to convert String
// to comma separated List

import java.util.*;

public class GFG {
    public static void main(String args[])
    {

        // Get the String
        String string = "Geeks For Geeks";

        // Print the String
        System.out.println("String: " + string);

        // convert String to array of String
        String[] elements = string.split(" ");

        // Convert String array to List of String
        // This List is unmodifiable
        List<String> list = Arrays.asList(elements);

        // Print the comma separated List
        System.out.println("Comma separated List: "
                           + list);
    }
}

Output:

String: Geeks For Geeks
Comma separated List: [Geeks, For, Geeks]

Creating a modifiable List:

Java

// Java program to convert String
// to comma separated List

import java.util.*;

public class GFG {
    public static void main(String args[])
    {

        // Get the String
        String string = "Geeks For Geeks";

        // Print the String
        System.out.println("String: " + string);

        // convert String to array of String
        String[] elements = string.split(" ");

        // Convert String array to List of String
        // This List is modifiable
        List<String>
            list = new ArrayList<String>(
                Arrays.asList(elements));

        // Print the comma separated List
        System.out.println("Comma separated List: "
                           + list);
    }
}

Output:

String: Geeks For Geeks
Comma separated List: [Geeks, For, Geeks]

Convert String into comma separated List in Java

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RishabhPrabhu

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Practice Tags :

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