Linkedlistd

/**
 * Write a description of class linked_listApp here.
 *
 * @author Samuel Berkat Hulu
 * @version 5.0 28-April-2021
 */

import java.util.LinkedList;
import java.util.Scanner;
import java.util.InputMismatchException;

public class linked_listApp
{
      private static LinkedList<String> dataStorage = new LinkedList<String>();

    private static Scanner extracted() {
        return new Scanner(System.in);
    }

    private static void displayData(){
        System.out.println("\nData dalam List: " + dataStorage);
        System.out.println("Total Data     : " + dataStorage.size());
    }

    private static void addData() {
        System.out.print("Masukkan Data: ");
        String tempData = extracted().nextLine();
        dataStorage.add(tempData);
        displayData();
    }

    private static void addDataToFirst() {
        System.out.print("Masukkan Data: ");
        String tempData = extracted().nextLine();
        dataStorage.addFirst(tempData);
        displayData();
    }

    private static void addDataToLast() {
        System.out.print("Masukkan Data: ");
        String tempData = extracted().nextLine();
        dataStorage.addLast(tempData);
        displayData();
    }

    private static void addDataAtLocation() {
        boolean status = true;
        int indexData = 0;
        displayData();
        while(status) {
            System.out.print("Pilih Index Data yang ingin disisipi data: [0-" + (dataStorage.size() - 1) + "]: ");
            try {
                status = false;
                indexData = extracted().nextInt();
            }
            catch(InputMismatchException e) {
                System.out.println("Data harus berupa Angka!");
                status = true;
            }
        }
        System.out.print("Data yang ingin disisipkan pada index data ke- " + indexData + ": ");
        String tempData = extracted().nextLine();
        dataStorage.add(indexData, tempData);
        displayData();
    }

    private static boolean searchData(String data) {
        return dataStorage.contains(data);
    }

    private static void removeData() {
        boolean status = true;
        int indexData = 0;
        displayData();
        while(status) {
            System.out.print("Pilih Index Data yang ingin dihapus: [0-" + (dataStorage.size() - 1) + "]: ");
            try {
                status = false;
                indexData = extracted().nextInt();
            }
            catch(InputMismatchException e) {
                System.out.println("Data harus berupa Angka!");
                status = true;
            }
        }
        dataStorage.remove(indexData);
        displayData();
    }

    private static void removeDataAtFirst() {
        dataStorage.removeFirst();
        displayData();
    }

    private static void removeDataAtLast() {
        dataStorage.removeLast();
        displayData();
    }

    private static void removeDataByContent() {
        displayData();
        System.out.print("Masukkan Data yang ingin dihapus: ");
        String data = extracted().nextLine();
        if(searchData(data)) {
            dataStorage.remove(data);
        }
        else {
            System.out.println("Anda memasukkan data yang tidak tersimpan di dalam list");
        }
        displayData();
    }

    private static void programExit() {
        System.exit(0);
    }

    private static void programTitle() {
        System.out.println("\nSimple Linked List Program\n");
    }

    private static void programSwitcher() {
        boolean status = true;
        int indexMenu = 0;
        while(status) {
            try {
                status = false;
                System.out.print("Pilih Menu [1~9]: ");
                indexMenu = extracted().nextInt();
            }
            catch(InputMismatchException e) {
                System.out.println("Masukan harus berupa Angka!");
                status = true;
            }
        }

        switch(indexMenu) {
            case 1: addData(); break;
            case 2: addDataToFirst(); break;
            case 3: addDataToLast(); break;
            case 4: addDataAtLocation(); break;
            case 5: removeData(); break;
            case 6: removeDataAtFirst(); break;
            case 7: removeDataAtLast(); break;
            case 8: removeDataByContent(); break;
            case 9: programTitle(); break;
            case 10: programExit(); break;
        }
        programMenu();
    }

    private static void programMenu() {
        System.out.println("\n.: PROGRAM MENU :."
                         + "\n 1. Add Data"
                         + "\n 2. Add Data at First"
                         + "\n 3. Add Data at Last"
                         + "\n 4. Add Data at N Index"
                         + "\n 5. Remove Data at N Index"
                         + "\n 6. Remove Data at First"
                         + "\n 7. Remove Data at Last"
                         + "\n 8. Remove Data by Data Content"
                         + "\n 9. About Program"
                         + "\n10. Program Exit");
        programSwitcher();
    }

    public static void main(String[] args) {
        programTitle();
        programMenu();
    }
}