class pro5
              {
              public static void main(String[] args) {
              // Create a StringBuilder
              StringBuffer s = new StringBuffer("Hello, ");
              System.out.println("\nOriginal String : "+s);
              // Add characters to the string
              s.append("how are you");
              
              // Print the final string
              System.out.println("Append a String is : "+s.toString()); // Output: "Hello, World!"
              }
              }