Chapter 6, Problem 14E

Explanation of Solution

Program code:

Duplicate.java

//import the required packages

import java.io.File;

import java.util.Arrays;

import java.util.Scanner;

//define a class Duplicate

public class Duplicate

{

    //define the main

public static void main(String[] args) throws Exception

{

//create the object of File class

File fileName = new File("file.txt");

//create the object of Scanner class to refer the file

Scanner input = new Scanner(fileName);

//call the method printDuplicates()

printDuplicates(input);

}

//define the method printDuplicates()

public static void printDuplicates (Scanner input)

{

    //iterate a while loop to get the lines

    while(input.hasNextLine())

    {

        //get the lines to string variable line

        String line=input.nextLine();

        //create a Scanner variable

        Scanner console=new Scanner (line);

        //next line

        String last=console.next();

        //create integer variable count

        int count=1;

        //iterate a while loop

        while(console.hasNext())

        {

//get the lines to the string variable current

            String current=console.next();

            //if the condition is true

            if(last.equals(current))

            {

                //increment the "count" by 1

                count++;

            }

            //if the condition is false

            else

            {

//if the value of count greater than 1

                if(count>1)

                {

//print the string and its count

                System.out...