Zoo

package zoo;

import java.awt.print.Book;
import java.util.ArrayList;
import java.util.Scanner;

public class Zoo {

    ArrayList<String> list = new ArrayList<String>();
    String Name;
    Scanner nhap = new Scanner(System.in);

    public void Add() {
        System.out.print("Nhap ten con vat: ");
        Name = nhap.nextLine();
        boolean check = false;
        for (int i = 0; i < list.size(); i++) {
            if (Name.equals(list.get(i))) {
                check = true;
            }
            break;
        }
        if (check == false) {
            list.add(Name);
        } else {
            System.out.println("Con vat nay da co roi!");
        }
    }

    public void Remove() {
        String sreachName;
        Scanner s = new Scanner(System.in);
        System.out.print("Nhap ten can xoa: ");
        sreachName = s.nextLine();
        boolean check = false;
        for (int i = 0; i < list.size(); i++) {
            if (sreachName.equals(list.get(i))) {
                list.remove(i);
                System.out.println("Da xoa");
                check = true;
            }
        }
        if (check == false) {
            System.out.println("Khong co ma xoa");
        }
    }

    public void sayHello() {
        System.out.println("Danh sach cac con dong vat:");
        for (int i = 0; i < list.size(); i++) {
            System.out.println(i + " " + list.get(i));
        }
    }

    public static void main(String[] args) {
        Zoo obj = new Zoo();
        Scanner scan = new Scanner(System.in);
        String x = "1";
        System.out.println("1 - Add");
        System.out.println("2 - Remove");
        System.out.println("3 - sayHello");
        System.out.println("4 - Exit");
        while (true) {
            System.out.println("Nhap chuc nang: ");
            x = scan.nextLine();
            switch (x) {
                case "1":
                    obj.Add();
                    break;
                case "2":
                    obj.Remove();
                    break;
                case "3":
                    obj.sayHello();
                    break;
                case "4":
                    System.exit(0);
                    break;
            }
        }
    }
}