Convert a List of String to a comma separated String in Java

Given a list of strings, the task is to convert a list of strings into a string that is separated by commas. It is a common task in Java that comes up frequently while working with formatting and data processing is converting a list of strings to a comma-separated string. By using commas to separate every element, the list's elements are combined into a single string during this procedure.

Example 1:

Input:

List<String> my_list = ["a", "b", "c", "d", "e", "f"]

Output:

The comma-separated strings from the given list are a, b, c, d, e, and f.

Explanation:

Given the list of strings ["a", "b", "c", "d", "e", "f"], we converted it to the general strings a, b, c, d, e, f.

Example 2:

Input:

List<String> my_list = ["Hello", "Welcome", "to", "World"]

Output:

The comma separated strings from the given list strings are Hello, Welcome, to, World.

Explanation:

Given the list of strings ["Hello", "Welcome", "to", "World"], then we converted the list of strings to the general strings such as Hello, Welcome, to, World.

Approach: Using join() method

The technique demonstrated here first initializes a list of strings by using an ArrayList and Arrays.asList(). Next, it concatenates the list's contents with a space and comma delimiter by using the String.join() method. Lastly, it prints the resultant comma-separated text along with the original list. By utilizing Java's collections and string manipulation techniques, this method effectively converts the list of strings into the required format.

Algorithm:

Step 1: Obtain the String List.

Step 2: By providing the list and the comma ", " as inputs, you can use the join() method to create a comma-separated String from the List of Strings.

Step 3: Display the String.

Implementation:

FileName: ConvertListStrings.java

Output

 The original given List of String: [a, b, c, d, e, f] The comma separated strings from the given list strings is: a, b, c, d, e, f