Chapter 6, Problem 19E

Explanation of Solution

Program code:

Test.java

//import the required packages

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

import java.io.PrintStream;

//define a class Test

public class Test

{

    //define a method leetSpeak

public static void leetSpeak(Scanner input, PrintStream output)

    {

        //iterate a while loop to get the lines

        while(input.hasNextLine())

        {

            //declare a Scanner object

            Scanner line = new Scanner(input.nextLine());

            //iterate a while loop

            while (line.hasNext())

            {

                //get the tokens to word

                String word = line.next();

                //replace the letters with numbers

word = word.replace("o", "0");

word = word.replace("l", "1");

word = word.replace("e", "3");

word = word.replace("a", "4");

word = word.replace("t", "7");

int n = word.length();

        //if the condition is true

        if (word.charAt(n-1) == 's')

        {

            //create the substrings

word = word...