How to Join a List of Strings with Custom Delimiter, Prefix, and Suffix Using Java 8 Streams

✅ Problem :

How do you join a list of strings with a custom delimiter, prefix, and suffix using Java 8 Streams?

✅ Example:

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class JoinStringsCustomDelimiter {
    public static void main(String[] args) {
        List<String> words = Arrays.asList("Apple", "Banana", "Grapes", "Blueberry");

        // Join strings with custom delimiter, prefix, and suffix
        String result = words.stream()
            .collect(Collectors.joining(", ", "[", "]"));

        System.out.println(result);
    }
}

✅ Output:

[Apple, Banana, Grapes, Blueberry]

✅ Explanation:

1. words.stream(): Converts the list of strings into a Stream of String objects.
2. Collectors.joining(“, “, “[“, “]”):
   • ", " is the delimiter between elements.
   • "[" is the prefix added at the beginning of the result.
   • "]" is the suffix added at the end of the result.
3. The result is a single string with all words joined by the delimiter and wrapped in brackets.
4. The output is printed using System.out.println().