private void show(String[] data){
		String option = null;
		try {
		option = data[1].toLowerCase();
		} catch(Exception e){
			System.out.println("Invalid command! Try to input command once more!");
			return;
		}
		switch(option){
		case "all":
			if(container.isEmpty())
				System.out.println("List of employees is empty!");
			System.out.println(container);
			break;
			//show certain type of employee
		default:
			MyArrayList<Employee> listOfCertainType = null;
			try {
				listOfCertainType = container.getType(option);
				System.out.println(listOfCertainType);
			} catch(IllegalArgumentException e){
				System.out.println(e.getMessage());
			}
			catch (Exception e) {
				System.out.println("Invalid command! Try to input command once more!");
			}
		}
	}