Explanation of Solution
Modified class “Vocabulary” that uses “Set” instead of “ArrayList”:
//Import required packages
import java.util.*;
import java.io.*;
//Definition of class Vocabulary
public class Vocabulary {
//Definition of main method
public static void main(String[] args)
throws FileNotFoundException
{
//Create an object for scanner class
Scanner sc = new Scanner(System.in);
//Call the method printIntro()
printIntro();
//Get the first file name
System.out.print("file #1 name? ");
String filename1 = sc.nextLine();
//Create an object for scanner class
Scanner file1 = new Scanner(new File(filename1));
//Get the second file
System.out.print("file #2 name? ");
String filename2 = sc.nextLine();
//Create an object for scanner class
Scanner file2 = new Scanner(new File(filename2));
System.out.println();
//Create an object for set
Set<String> set1 = getWordsFromFile(file1);
Set<String> set2 = getWordsFromFile(file2);
Set<String> overlap = new TreeSet(set1);
//Call the method retainAll
overlap.retainAll(set2);
//Call the method Result
Result(set1, set2, overlap);
}
//Definition of method getWordsFromFile
public static Set<String> getWordsFromFile(Scanner input) {
//Create an object for set
Set<String> result = new TreeSet<String>();
// read all words from the file
while (input.hasNext()) {
//Get the values and store it in val
String val = input.next().toLowerCase();
//Add the value to the result
result...
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