Iliev's homework-23_1-MethodsApplication

import java.util.Scanner;

public class iliev1 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        iliev DataBase= new iliev();
        String input="";

        while (!input.equals("end")) {
            input = scan.nextLine();
            if (input.equals("add")) {
                System.out.println("The person who you want to add: ");
                int ClassNum = scan.nextInt();
                String Name  = scan.next();
                String Surname = scan.next();
                String PhoneNum = scan.next();
                String full =ClassNum + "-" + Name + " " + Surname + " /" + PhoneNum +"/";
                if(DataBase.contains(full) == false) {
                    DataBase.add(full);
                }
                System.out.println();

            }else if(input.equals("rem")){
                System.out.println("The person who you want to remove: ");
                int ClassNum = scan.nextInt();
                String Name  = scan.next();
                String Surname = scan.next();
                String PhoneNum = scan.next();
                String full =ClassNum + "-" + Name + " " + Surname + " /" + PhoneNum +"/";

                if(DataBase.contains(full) == true) {
                    DataBase.remove(full);
                }
                System.out.println();
            }else if(input.equals("cnt")){
                System.out.println("\nThe list contains " + DataBase.getLength()+" people.");
                System.out.println();
            }else if(input.equals("prn")){
                System.out.println("The list includes: ");
                for (int i = 0; i < DataBase.getLength(); i++) {
                    System.out.printf((String) DataBase.elementAt(i));
                    System.out.println();
                }
            }
        }

    }
}