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Oct 18th, 2019
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  1. package ExamPreparation;
  2.  
  3. import java.util.ArrayDeque;
  4. import java.util.Arrays;
  5. import java.util.Scanner;
  6. import java.util.stream.Collectors;
  7.  
  8. public class Agency {
  9. public static void main(String[] args) {
  10. Scanner scanner = new Scanner(System.in);
  11. ArrayDeque<String> ids = new ArrayDeque<>();
  12. ArrayDeque<String> agents = new ArrayDeque<>();
  13.  
  14. Arrays.stream(scanner.nextLine().split("\\s+")).forEach(ids::push);
  15. Arrays.stream(scanner.nextLine().split("\\s+")).forEach(agents::offer);
  16.  
  17. String line = scanner.nextLine();
  18.  
  19. while (!line.equalsIgnoreCase("stop")) {
  20. String[] tokens = line.split("\\s+");
  21. String command = tokens[0];
  22.  
  23. switch (command) {
  24. case "add-ID":
  25. String newId = tokens[1];
  26. ids.push(newId);
  27. break;
  28. case "add-agent":
  29. String newAgent = tokens[1];
  30. agents.offer(newAgent);
  31. break;
  32. case "remove-ID":
  33. System.out.printf("%s has been removed.%n", ids.pop());
  34. break;
  35. case "remove-agent":
  36. System.out.printf("%s has left the queue.%n", agents.pollLast());
  37. break;
  38. case "sort-ID":
  39. ids = ids.stream().sorted((x, y) -> y.compareTo(x)).collect(Collectors.toCollection(ArrayDeque::new));
  40. break;
  41. }
  42.  
  43. line = scanner.nextLine();
  44. }
  45.  
  46.  
  47. while (!ids.isEmpty() && !agents.isEmpty()) {
  48. String id = ids.pop();
  49. String agent = agents.poll();
  50.  
  51. System.out.printf("%s takes ID number: %s%n", agent, id);
  52. }
  53.  
  54. while (!ids.isEmpty()) {
  55. System.out.println("No more agents left.");
  56. System.out.printf("ID number: %s%n", ids.pop());
  57. }
  58.  
  59. while (!agents.isEmpty()) {
  60. System.out.printf("%s does not have an ID.%n", agents.poll());
  61. }
  62.  
  63. }
  64. }
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