Program screenshots:
https://media.cheggcdn.com/media%2F0e5%2F0e55792c-2a1f-4990-a6b4-ae828d65debf%2Fphp5Xs0c7.png

https://media.cheggcdn.com/media%2F5e3%2F5e399620-3abb-4e46-bcc8-f9af7884f27a%2Fphpa1cTgR.png

https://media.cheggcdn.com/media%2Fed3%2Fed39192b-08fa-469a-a4de-cf3e8526200f%2FphpuYksBg.png

https://media.cheggcdn.com/media%2Fdfa%2Fdfac9b58-90cd-4ded-997c-c520696d3ac6%2Fphpdy1LT6.png

Sample output:
https://media.cheggcdn.com/media%2F9cc%2F9cc03563-c452-43fc-a73d-97ae0ee2ee2d%2Fphpo3HFVf.png

Code to be copied:
//import required packages
import java.util.Scanner;
//Declare the class SillyString
public class SillyString
{
   //Main method
   public static void main(String[] args)
   {
       //Declare local variables
       String last_name,unit,vegetable,original_quote,replaced_quote;

       //Classic Tongue Twister
       original_quote = "Peter Piper picked a peck of pickled peppers." ;
       //Create a scanner object
       Scanner sc = new Scanner(System.in);

       //Prompt and read the last name
       System.out.print("Enter your last name:");
       last_name = sc.nextLine();
       //Prompt and read the unit of measurement
       System.out.print("Enter a unit of measurement:");
       unit = sc.nextLine();

       //remove the spaces
       unit = unit.trim();

       //converts to lowercase if any upper case is present
       unit = unit.toLowerCase();

       //prompt the vegetable
       System.out.print("Enter the name of a vegetable:");
       vegetable = sc.nextLine();

       //remove the spaces
       vegetable = vegetable.trim();
       //convert to lower case
       vegetable = vegetable.toLowerCase()+"s";
       //call the test case
       testProperCase();

       //Test the real input
       last_name = properCase(last_name);
       //displaying all the finalised input strings
       System.out.println("\nFinalised Last name : "+last_name);
       System.out.println("Finalised Unit : "+unit);
       System.out.println("Finalised veggie : "+vegetable);
       //replacing all the string in the original Tongue
       //Twister with the inputted formatted strings
       replaced_quote = original_quote.replace("Piper",last_name);
       replaced_quote = replaced_quote.replace("peck",unit);
       replaced_quote = replaced_quote.replace("peppers",vegetable);
       //displaying both Original and Replaced Tongue Twisters
       System.out.println("\nOriginal Tongue Twister : "
               +original_quote);
       System.out.println("Replaced Tongue Twister : "
               +replaced_quote);
   }//end of main method
   //Implement the method properCase
   public static String properCase(String name)
   {
       //declare local variables
       String lastname="",secondname="";
       int space;
       //returns the name with the first letter
       //in upper case and the rest lower case
       lastname = name.substring(0, 1).toUpperCase()
               + name.substring(1).toLowerCase();

       //Remove the space starting and ending
       lastname = lastname.trim();
       //get the index of the space
       space = name.indexOf(" ");

       //For multiple words
       if(space != -1)
       {
           //Get the string
           secondname = lastname.substring(space);

           //make the 2nd word (which is present after space) to lower case
           lastname = lastname.substring(0,space)+secondname.toLowerCase();
       }
       //return the name
       return lastname;
   }
   //Runs tests on the properCase method.
   public static void testProperCase()
   {
       //Test cases
       System.out.println("Test Case 1 zHang = "
               +properCase("zHang"));
       System.out.println("Test Case 2 zHang = "
               +properCase(" zHang "));
       System.out.println("Test Case 3 z_Hang = "
               +properCase("z_Hang"));
       System.out.println("Test Case 4 zHang Piper = "
               +properCase("zHang Piper"));
   }
}//end of class