StringJoiner add() method in Java

The add(CharSequence newElement) of StringJoiner adds a copy of the given CharSequence value as the next element of the StringJoiner value. If newElement is null, then “null” is added.
Syntax:

public StringJoiner add(CharSequence newElement)

Parameters: This method takes a mandatory parameter newElement which is the element to be added.
Returns: This method returns a reference to this StringJoiner
Below programs illustrate the add() method:
Example 1: To demonstrate add() with delimiter ” ” 

Java

// Java program to demonstrate
// add() method of StringJoiner

import java.util.StringJoiner;

public class GFG1 {
    public static void main(String[] args)
    {

        // Creating StringJoiner with delimiter " "
        StringJoiner str = new StringJoiner(" ");

        // Adding elements in the StringJoiner
        str.add("Geeks");
        str.add("for");
        str.add("Geeks");

        // Print the StringJoiner
        System.out.println(str.toString());
    }
}

Output:

Geeks for Geeks

Example 2: To demonstrate add() with delimiter “,”

Java

// Java program to demonstrate
// add() method of StringJoiner

import java.util.StringJoiner;

public class GFG1 {
    public static void main(String[] args)
    {

        // Creating StringJoiner with delimiter ","
        StringJoiner str = new StringJoiner(",");

        // Adding elements in the StringJoiner
        str.add("Geeks");
        str.add("for");
        str.add("Geeks");

        // Print the StringJoiner
        System.out.println(str.toString());
    }
}

Output:

Geeks,for,Geeks