What is a StringBuilder?

 - Mutable sequence of characters.

Unlike, String which is immutable (cannot be changed).

Benefits:

1. Allows you to append, insert or delete characters efficiently without creating a new object each time.

CODE:

public class Main {

    public static void main(String str[]) {

        StringBuilder sb = new StringBuilder();

        sb.append("Hello");

        sb.append(" World");

        System.out.println(sb.toString()); // Output: Hello World

    }

}