Excel Functions

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

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

        int n = Integer.parseInt(scanner.nextLine());

        String[][] matrix = new String[n][n];
        String[] header = scanner.nextLine().split(", ");
        List<String> list = new ArrayList<>();
        for (int i = 0; i < n-1; i++) {
            list.add(scanner.nextLine());
        }
        String[] command = scanner.nextLine().split("\\s+");
       List<String> newList = new ArrayList<>();

        switch (command[0]) {
            case "hide":
                String nameH = command[1];
                int indexH = -1;
                for (int i = 0; i < header.length; i++) {
                    if (header[i].equals(command[1])) {
                        indexH = i;
                        int finalIndex = indexH;

                    }
                }

                for (int i = 0; i < header.length; i++) {
                    if (i != indexH) {
                        if (i != header.length - 1) {
                            System.out.print(header[i] + " | ");
                        } else {
                            System.out.print(header[i]);
                        }
                    }
                }
                System.out.println();
                for (int i = 0; i <list.size() ; i++) {
                    String[] text =list.get(i).split(", ");
                    for (int j = 0; j <header.length ; j++) {
                        if (j != indexH) {
                            if (j != header.length - 1) {
                                System.out.print(text[j] + " | ");
                            } else {
                                System.out.print(text[j]);
                            }
                        }
                    }
                    System.out.println();
                }

                break;
            case "sort":

                for (int i = 0; i < header.length; i++) {

                    if (i != header.length - 1) {
                        System.out.print(header[i] + " | ");
                    } else {
                        System.out.print(header[i]);
                    }
                }
                System.out.println();
                int index = -1;
                for (int i = 0; i < header.length; i++) {
                    if (header[i].equals(command[1])) {
                        index = i;
                        int finalIndex = index;
                       newList=list.stream().sorted(Comparator.comparing(f -> f.split(", ")[finalIndex])).collect(Collectors.toList());
                    }
                }
                for (int i = 0; i <newList.size() ; i++) {
                   String[] text =newList.get(i).split(", ");
                        for (int j = 0; j <header.length ; j++) {
                            if (j!=header.length-1){
                                System.out.print(text[j]+" | ");
                            }else   {
                                System.out.print(text[j]);
                            }
                        }
                    System.out.println();
                    }

                break;
            case "filter":

                for (int i = 0; i < header.length; i++) {

                    if (i != header.length - 1) {
                        System.out.print(header[i] + " | ");
                    } else {
                        System.out.print(header[i]);
                    }
                }
                System.out.println();
                String name = command[2];
                int indexF = -1;
                for (int i = 0; i < header.length; i++) {
                    if (header[i].equals(command[1])) {
                        indexF = i;
                        int finalIndex = indexF;
                        newList=list.stream()
                                .filter(f->f.split(", ")[finalIndex].equals(name))
                                .collect(Collectors.toList());

                    }
                }
                for (int i = 0; i <newList.size() ; i++) {
                    String[] text =newList.get(i).split(", ");
                    for (int j = 0; j <header.length ; j++) {
                        if (j!=header.length-1){
                            System.out.print(text[j]+" | ");
                        }else   {
                            System.out.print(text[j]);
                        }
                    }
                    System.out.println();
                }
                break;
        }

    }
}