JF-MidExam-10March-Group2-02.TheFinalQuest

package com.company;

import java.util.*;
import java.util.stream.Collectors;
import static java.lang.Integer.valueOf;
import static java.util.Collections.*;

public class FinalQuest {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        List<String> strings = Arrays.stream(sc.nextLine().split(" ")).collect(Collectors.toList());
        String input = sc.nextLine();

        while (!input.equals("Stop")) {
            String[] command = input.split(" ");
            switch (command[0]) {
                case "Delete":
                    int indexDelete = valueOf(command[1]) + 1;
                    if (isValid(strings, indexDelete)) {
                        strings.remove(indexDelete);
                    }
                    break;
                case "Swap":
                    int index1 = strings.indexOf(command[1]);
                    int index2 = strings.indexOf(command[2]);
                    if (index1 >= 0 && index2 >= 0 && index1 < strings.size() && index2 < strings.size()) {
                        String string1 = command[1];
                        strings.set(index1, command[2]);
                        strings.set(index2, string1);
                    }
                    break;
                case "Put":
                    int index = Integer.parseInt(command[2]) - 1;
                    if (isValid(strings, index)) {
                        strings.add(index, command[1]);
                    } else if (index == strings.size()) {
                        strings.add(command[1]);
                    }
                    break;
                case "Sort":
                    Collections.sort(strings);
                    Collections.reverse(strings);
                    break;
                case "Replace":
                    index = strings.indexOf(command[2]);
                    if (isValid(strings, index)) {
                        strings.set(index, command[1]);
                    }

                    break;

                default:
                    throw new IllegalStateException("Unknown" + command[0]);
            }
            input = sc.nextLine();
        }
        for (String word : strings)
            System.out.print(word + " ");
    }
    private static boolean isValid(List<String> strings, int index) {
        return 0 <= index && index < strings.size();
    }
}