public class Controller {

private Scanner scanner = new Scanner(System.in);
private Items items;
public Controller(){
    this.items = new Items();
}

private void showAction(){
    this.items.showItem();
}

private void addItem(){
    System.out.print("Add Item: ");
    String item = scanner.nextLine();
    this.items.addItem(item);
}

private void editItem(){
    System.out.println("Enter current name: ");
    String item = scanner.nextLine();
    System.out.print("Enter new Item name: ");
    String newitem = scanner.nextLine();
    this.items.editItem(item,newitem);
}

private void removeItem(){
    System.out.print("Remove Item: ");
    String item = scanner.nextLine();

    this.items.removeItem(item);
}

private void searchItem(){
    System.out.print("Enter item name: ");
    String item = scanner.nextLine();
    this.items.searchItem(item);
}

public void print(){
    System.out.println("t 0. Show Command");
    System.out.println("t 1. Add Item");
    System.out.println("t 2. Edit Item");
    System.out.println("t 3. Remove Item");
    System.out.println("t 4. Search Item");
    System.out.println("t 5. Show Item");
    System.out.println("t 6. Exit Application");
}

public void Execute(){
    boolean quit = false;
    int choice = 0;

    while(!quit){
        System.out.print("Enter command: ");
        choice = scanner.nextInt();
        scanner.nextLine();
        switch(choice){
            case 0:
                print();
                break;
            case 1:
                addItem();
                break;
            case 2:
                editItem();
                break;
            case 3:
                removeItem();
                break;
            case 4:
                searchItem();
                break;
            case 5:
                showAction();
                break;
            case 6:
                quit = true;
                break;
        }
    }
}
}

public class Items {
    private ArrayList<String> list = new ArrayList<>();

  public void addItem(String item){
      list.add(item);
  }

  public void showItem(){
      System.out.println("you have " + list.size() + " in you grocery list");
      for (int i =0;i<list.size();i++){
          System.out.println((i + 1) + ". " + list.get(i));
      }
  }

  public void editItem(String currentItem,String item){
      int position = searchItem(item);
      if(position>=0){
          editItem(position,item);
          System.out.println("Item: " + currentItem + " has been modified to: " + item);
      }
  }

  private void editItem(int position, String item){
      list.set(position,item);
  }

  public void removeItem(String item){
      int position = searchItem(item);
      if(position>=0){
          removeItem(position);
      }
  }

  private void removeItem(int position){
      //String item = list.get(position);
      list.remove(position);
  }

  public int searchItem(String item){
      return list.indexOf(item);
  }
}

public static void main(String[] args) {
        Controller controller = new Controller();
        controller.print();
        controller.Execute();
    }

if(position>=0){
    removeItem(position);
}

if(position >= 0) removeItem(position);

do {
    System.out.print("Enter command within range (inclusive) 0-6: ");
    while(!scanner.hasNextInt()) {//continue iterating while the value held in scanner is not an integer
    System.out.print("Your input must be an integer, please re-enter: ");
        scanner.next();//take another input
    }
    choice = scanner.nextInt();//sets 'choice' to the integer just entered into the scanner
}while(choice < 0 || choice > 6);