JF-MidExam-30June-Group1-03.ContactList

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Scanner;
import java.util.stream.Collectors;
import java.util.List;

public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);

List<String> numbers = Arrays.stream(sc.nextLine().split("\\s")).collect(Collectors.toList());
String command = sc.nextLine();
String[] tokens = command.split("\\s");

  while(!tokens[0].equals("Print")) {

    switch(tokens[0]) {

      case "Add":
      String contact = tokens[1];
      int index = Integer.parseInt(tokens[2]);
        if (numbers.indexOf(contact) == -1) {
          numbers.add(contact);
        } else if (index >= 0 && index < numbers.size()) {
          numbers.add(index, contact);
        }
      break;

      case "Remove":
        int index2 = Integer.parseInt(tokens[1]);
          if (index2 >= 0 && index2 < numbers.size()) {
            numbers.remove(index2);
          }
      break;

      case "Export":
        int startIndex = Integer.parseInt(tokens[1]);
        int count = Integer.parseInt(tokens[2]);
          if (startIndex > -1) {
            if  (startIndex + count < numbers.size()) {
              for (int i = startIndex; i < startIndex + count; i++) {
                System.out.print(numbers.get(i) + " ");
                }

//            System.out.println();
            } else if (startIndex + count >= numbers.size()) {
                for (int i = startIndex; i < numbers.size(); i++) {
                System.out.print(numbers.get(i) + " ");

             }
            }
            System.out.println();
          }
      break;
    }
      command = sc.nextLine();
      tokens = command.split(" ");

  }

      if(tokens[0].equals("Print")) {
        if (tokens[1].equals("Normal")) {
          System.out.print("Contacts: ");
          System.out.print(String.join((" "), numbers));
        } else if (tokens[1].equals("Reversed")) {
            Collections.reverse(numbers);
            System.out.print("Contacts: ");
          System.out.print(String.join((" "), numbers));
        }
      }
  }
}