What's the Most Efficient Way to Join Array Elements in Java?

Efficient Array Joining in Java

Joining array elements with a separator is a common operation. Java provides multiple methods to achieve this, including using a loop or third-party libraries.

Using the String.join() Method

Introduced in Java 8, the String.join() method offers a concise and efficient way to join elements. It takes two arguments:

• delimiter: The character or string to insert between elements.
• elements: An array, list, or iterable of elements to join.

For example, to join the array ["a", "b", "c"] with a comma, use:

String joined = String.join(",", "a", "b", "c");

Other Methods

If String.join() is unavailable, you can use other methods:

• Using a loop with StringBuilder:

StringBuilder builder = new StringBuilder();
for (String element : array) {
    if (builder.length() > 0) {
        builder.append(",");
    }
    builder.append(element);
}
String joined = builder.toString();

• Using java.util.stream.Collectors:

String joined = Arrays.stream(array).collect(Collectors.joining(","));

Conclusion

The String.join() method is the preferred approach for joining array elements in Java 8 and later. It is concise, efficient, and easy to use, allowing you to quickly convert arrays to comma-separated strings or strings with any other desired delimiter.

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