Change_List

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class Change_List {
    public static void main(String[] args) throws IOException {
        BufferedReader reader =
                new BufferedReader(
                        new InputStreamReader(System.in));

        System.out.println("Enter some numbers ");
        List<String> elements = Arrays.stream(reader.readLine().split("\\s+"))
        .collect(Collectors.toList());

        System.out.println("Enter command ");

        String input = " ";

        while(!"end".equals(input = reader.readLine())) {

            String []data = input.split(" ");
            String command = data[0];

            switch (command) {

                case "delete":
                  elements = elements.stream().filter(e -> !e.equals(data[1]))
                            .collect(Collectors.toList());

                    break;

                case "insert":
                    String element = data[1];
                    int position = Integer.parseInt(data[2]);
                    if(0 <= position && position <elements.size()) {
                        elements.add(position, element);
                    }

                    break;

            }

        }
        System.out.println(elements);
    }
}