How to Efficiently Join Array Elements in Java with a Separator?

Jointing Array Elements with a Separator in Java

In Java, splitting a string into an array is a common operation using the split method. However, the inverse operation, joining array elements into a single string with a separator, requires additional effort.

For a quick and efficient solution, consider using Java 8's String.join method, which combines multiple elements into a string. This method accepts two parameters: a delimiter (separator) and the elements to join.

How to Use String.join:

String.join offers several options for specifying the elements to join:

• Directly specifying elements: String.join(",", "a", "b", "c")
• Using arrays: String.join(",", new String[] { "a", "b", "c" })
• Using iterables: String.join(",", Arrays.asList(new String[] { "a", "b", "c" }))

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

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

Alternatives to String.join:

If Java 8 is not available, alternative approaches include:

• Iterating over the array and appending each element with the separator
• Using a StringBuilder and concatenating the elements manually

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