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

Converting Comma-Separated Strings to Lists

When working with data in Java, the need often arises to manipulate comma-separated strings. A common problem faced by developers is finding a convenient method to convert these strings into Lists, Vectors, or arrays for further processing.

Java offers a built-in method to streamline this conversion process: Arrays.asList(). This method takes a comma-separated string as input and parses it into a List of individual elements.

The syntax for converting a comma-separated string into a List using Arrays.asList() is:

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

where:

• str is the comma-separated string
• s,s is the delimiter pattern for splitting the string on commas, optionally surrounded by whitespace

This pattern will split the string on any occurrence of a literal comma, regardless of surrounding whitespace.

For example:

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

This code will create a list containing the elements ["item1", "item2", "item3"].

Important Note:

It's important to note that Arrays.asList() returns a fixed-size wrapper over an existing array. This means that methods like .remove() cannot be used to modify the resulting List. To obtain a modifiable ArrayList from the result, you must create a new ArrayList instance:

ArrayList<String> itemsModifiable = new ArrayList<>(items);

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