How to Convert a Comma-Separated String to a List in Java?

Converting Comma-Separated Strings to Lists

In Java, manipulating and storing collections of data in an organized manner is often necessary. A common scenario involves converting a comma-separated string into a list, such as converting "item1, item2, item3" into ["item1", "item2", "item3"].

Built-in Method

The Java API doesn't provide a direct method to perform this conversion. Therefore, it's necessary to resort to custom code.

Custom Code

To convert a comma-separated string to a list, you can use the following approach:

String commaSeparated = "item1 , item2 , item3";
List<String> items = Arrays.asList(str.split("\s*,\s*"));

Explanation:

1. The split() method is used to split the input string into tokens based on the delimiter, which is defined as zero or more whitespace characters followed by a literal comma followed by zero or more whitespace characters again.
2. The resulting tokens are stored in an array of strings.
3. The Arrays.asList() method is used to convert the array into a list, which is backed by the original array.

Note:

The resulting list will be a wrapper around the array, meaning you cannot perform operations like .remove() on it. To obtain a true ArrayList, you can use:

List<String> items = new ArrayList<>(Arrays.asList(str.split("\s*,\s*")));

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