Java List Join: Concatenate Elements

1 year ago
Isabella Edwards
1 minute

In Java, List does not have a direct join method to concatenate all elements. However, you can achieve similar functionality using the Stream API in Java 8.

For example, the Collectors.joining() method can be used to join all elements in a List as shown below:

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

public class ListJoinExample {
    public static void main(String[] args) {
        List<String> list = List.of("apple", "banana", "cherry");
        
        String result = list.stream()
                            .collect(Collectors.joining(", "));
        
        System.out.println(result);
    }
}

In the example above, we first created a List containing three elements. Then, we used the collect method of the Stream API and Collectors.joining(“, “) method to join all elements in the List, and printed the result.

The output of the operation will be:

apple, banana, cherry
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