Question

In Java, using Collections, Ask the user for Strings until he or she types exit. Display those String without duplicates in alphabetical order.

Please provide comments to get a better understanding.

//////////////////////////////////////////////////////////////////Required output\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

Test Case 1

Standard Input
cENTER bENTER bENTER cENTER aENTER aENTER exit

Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
a\n
b\n
c\n

Test Case 2

Standard Input
bENTER cENTER aENTER aENTER exit

Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
a\n
b\n
c\n

Test Case 3

Standard Input
process improvementENTER strategyENTER VersatileENTER encodingENTER monitoringENTER ImplementedENTER encompassingENTER ProfoundENTER 4th generationENTER Grass-rootsENTER encodingENTER monitoringENTER exit

Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
4th generation\n
encoding\n
encompassing\n
Grass-roots\n
Implemented\n
monitoring\n
process improvement\n
Profound\n
strategy\n
Versatile\n

Test Case 4

Standard Input
FundamentalENTER executiveENTER intermediateENTER Customer-focusedENTER portalENTER ErgonomicENTER MandatoryENTER capacityENTER solutionENTER mission-criticalENTER exit

Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
capacity\n
Customer-focused\n
Ergonomic\n
executive\n
Fundamental\n
intermediate\n
Mandatory\n
mission-critical\n
portal\n
solution\n

Test Case 5

Standard Input

pricing structureENTER web-enabledENTER mobileENTER middlewareENTER InnovativeENTER leverageENTER hubENTER explicitENTER asymmetricENTER time-frameENTER throughputENTER globalENTER fresh-thinkingENTER conceptENTER localENTER Triple-bufferedENTER firmwareENTER TotalENTER collaborationENTER challengeENTER AutomatedENTER encodingENTER UniversalENTER internet solutionENTER bottom-lineENTER Multi-lateralENTER actuatingENTER neutralENTER monitoringENTER exit

Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
actuating\n
asymmetric\n
Automated\n
bottom-line\n
challenge\n
collaboration\n
concept\n
encoding\n
explicit\n
firmware\n
fresh-thinking\n
global\n
hub\n
Innovative\n
internet solution\n
leverage\n
local\n
middleware\n
mobile\n
monitoring\n
Multi-lateral\n
neutral\n
pricing structure\n
throughput\n
time-frame\n
Total\n
Triple-buffered\n
Universal\n
web-enabled\n

Test Case 6

Standard Input

UniversalENTER internet solutionENTER bottom-lineENTER Multi-lateralENTER pricing structureENTER web-enabledENTER mobileENTER middlewareENTER InnovativeENTER leverageENTER hubENTER explicitENTER asymmetricENTER time-frameENTER throughputENTER globalENTER fresh-thinkingENTER conceptENTER localENTER Triple-bufferedENTER firmwareENTER TotalENTER collaborationENTER challengeENTER AutomatedENTER leverageENTER hubENTER explicitENTER asymmetricENTER time-frameENTER throughputENTER globalENTER fresh-thinkingENTER encodingENTER UniversalENTER internet solutionENTER bottom-lineENTER Multi-lateralENTER leverageENTER hubENTER explicitENTER asymmetricENTER time-frameENTER throughputENTER globalENTER fresh-thinkingENTER actuatingENTER neutralENTER monitoringENTER UniversalENTER internet solutionENTER bottom-lineENTER Multi-lateralENTER exit

Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
Enter a line of text\n
actuating\n
asymmetric\n
Automated\n
bottom-line\n
challenge\n
collaboration\n
concept\n
encoding\n
explicit\n
firmware\n
fresh-thinking\n
global\n
hub\n
Innovative\n
internet solution\n
leverage\n
local\n
middleware\n
mobile\n
monitoring\n
Multi-lateral\n
neutral\n
pricing structure\n
throughput\n
time-frame\n
Total\n
Triple-buffered\n
Universal\n
web-enabled\n

Answer 1

Given below is the code for the question. Please do rate the answer if it helped. Thank you.

import java.util.Comparator;
import java.util.Scanner;
import java.util.TreeSet;

public class UniqueWords {
   public static void main(String[] args) {
       Scanner in = new Scanner(System.in);
       String line;
       boolean done = false;
       TreeSet<String> set = new TreeSet<String>(new Comparator<String>() {

           @Override
           public int compare(String o1, String o2) {
               return o1.compareToIgnoreCase(o2);
           }
       }); //create a treeset which compares string ignoring their case. Also treeset store unique values and in sorted manner

       while(!done){

           System.out.println("Enter a line of text:");
           line = in.nextLine();
           if(line.equalsIgnoreCase("exit"))
               done = true;
           else
               set.add(line);
       }  
       for(String s: set)
           System.out.println(s);
   }
}

output
----
Enter a line of text:
pricing structure
web-enabled
mobile
middleware
Innovative
leverage
hub
explicit
asymmetric
time-frame
throughput
global
fresh-thinking
concept
local
Triple-buffered
firmware
Total
collaboration
challenge
Automated
encoding
Universal
internet solution
bottom-line
Multi-lateral
actuating
neutral
monitoring
exitEnter a line of text:
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Enter a line of text:
Enter a line of text:
Enter a line of text:
Enter a line of text:
Enter a line of text:
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Enter a line of text:
Enter a line of text:
Enter a line of text:
Enter a line of text:
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Enter a line of text:

actuating
asymmetric
Automated
bottom-line
challenge
collaboration
concept
encoding
explicit
firmware
fresh-thinking
global
hub
Innovative
internet solution
leverage
local
middleware
mobile
monitoring
Multi-lateral
neutral
pricing structure
throughput
time-frame
Total
Triple-buffered
Universal
web-enabled