1. Introduction

Joining is a common operation in programming where you concatenate the elements of a list with a delimiter. In Java, String.join() method can be used to join elements of a List. This method is available since Java 8 and is a convenient utility for this purpose.

2. Program Steps

1. Create a List of String.

2. Use the String.join() method to join the elements of the list with a delimiter.

3. Print the resulting String to the console.

3. Code Program

import java.util.Arrays;
import java.util.List;

public class ListJoinExample {

    public static void main(String[] args) {
        // Step 1: Create a List of String
        List<String> fruits = Arrays.asList("Apple", "Banana", "Cherry", "Date");

        // Step 2: Use the String.join() method to join the elements of the list with a delimiter
        String result = String.join(", ", fruits);

        // Step 3: Print the resulting String to the console
        System.out.println(result);
    }
}

Output:

Apple, Banana, Cherry, Date

4. Step By Step Explanation

Step 1: We create a List of String containing names of fruits.

Step 2: We use the String.join() method to concatenate the elements of the list, separating each element with a comma and a space.

Step 3: The resulting String is printed to the console, showing the elements of the list joined with the specified delimiter.